diff --git a/mercurial/changegroup.py b/mercurial/changegroup.py
--- a/mercurial/changegroup.py
+++ b/mercurial/changegroup.py
@@ -818,18 +818,24 @@ class cg2packer(cg1packer):
 
     def deltaparent(self, revlog, rev, p1, p2, prev):
         dp = revlog.deltaparent(rev)
-        # Avoid sending full revisions when delta parent is null. Pick
-        # prev in that case. It's tempting to pick p1 in this case, as p1
-        # will be smaller in the common case. However, computing a delta
-        # against p1 may require resolving the raw text of p1, which could
-        # be expensive. The revlog caches should have prev cached, meaning
-        # less CPU for changegroup generation. There is likely room to add
-        # a flag and/or config option to control this behavior.
-        #
-        # Pick prev when we can't be sure remote has the base revision.
-        if dp == nullrev or (dp != p1 and dp != p2 and dp != prev):
+        if dp == nullrev and revlog.storedeltachains:
+            # Avoid sending full revisions when delta parent is null. Pick prev
+            # in that case. It's tempting to pick p1 in this case, as p1 will
+            # be smaller in the common case. However, computing a delta against
+            # p1 may require resolving the raw text of p1, which could be
+            # expensive. The revlog caches should have prev cached, meaning
+            # less CPU for changegroup generation. There is likely room to add
+            # a flag and/or config option to control this behavior.
             return prev
-        return dp
+        elif dp == nullrev:
+            # revlog is configured to use full snapshot for a reason,
+            # stick to full snapshot.
+            return nullrev
+        elif dp not in (p1, p2, prev):
+            # Pick prev when we can't be sure remote has the base revision.
+            return prev
+        else:
+            return dp
 
     def builddeltaheader(self, node, p1n, p2n, basenode, linknode, flags):
         # Do nothing with flags, it is implicitly 0 in cg1 and cg2
diff --git a/tests/test-acl.t b/tests/test-acl.t
--- a/tests/test-acl.t
+++ b/tests/test-acl.t
@@ -113,7 +113,7 @@ Extension disabled for lack of a hook
   adding quux/file.py revisions
   added 3 changesets with 3 changes to 3 files
   updating the branch cache
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
   pushing key for "phases:911600dab2ae7a9baff75958b84fe606851ce955"
   bundle2-input-bundle: 3 parts total
@@ -178,7 +178,7 @@ Extension disabled for lack of acl.sourc
   calling hook pretxnchangegroup.acl: hgext.acl.hook
   acl: changes have source "push" - skipping
   updating the branch cache
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
   pushing key for "phases:911600dab2ae7a9baff75958b84fe606851ce955"
   bundle2-input-bundle: 3 parts total
@@ -254,7 +254,7 @@ No [acl.allow]/[acl.deny]
   acl: branch access granted: "911600dab2ae" on branch "default"
   acl: path access granted: "911600dab2ae"
   updating the branch cache
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
   pushing key for "phases:911600dab2ae7a9baff75958b84fe606851ce955"
   bundle2-input-bundle: 3 parts total
@@ -325,7 +325,7 @@ Empty [acl.allow]
   acl: acl.deny not enabled
   acl: branch access granted: "ef1ea85a6374" on branch "default"
   error: pretxnchangegroup.acl hook failed: acl: user "fred" not allowed on "foo/file.txt" (changeset "ef1ea85a6374")
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-bundle: 3 parts total
   transaction abort!
   rollback completed
@@ -394,7 +394,7 @@ fred is allowed inside foo/
   acl: path access granted: "f9cafe1212c8"
   acl: branch access granted: "911600dab2ae" on branch "default"
   error: pretxnchangegroup.acl hook failed: acl: user "fred" not allowed on "quux/file.py" (changeset "911600dab2ae")
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-bundle: 3 parts total
   transaction abort!
   rollback completed
@@ -460,7 +460,7 @@ Empty [acl.deny]
   acl: acl.deny enabled, 0 entries for user barney
   acl: branch access granted: "ef1ea85a6374" on branch "default"
   error: pretxnchangegroup.acl hook failed: acl: user "barney" not allowed on "foo/file.txt" (changeset "ef1ea85a6374")
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-bundle: 3 parts total
   transaction abort!
   rollback completed
@@ -531,7 +531,7 @@ fred is allowed inside foo/, but not foo
   acl: path access granted: "f9cafe1212c8"
   acl: branch access granted: "911600dab2ae" on branch "default"
   error: pretxnchangegroup.acl hook failed: acl: user "fred" not allowed on "quux/file.py" (changeset "911600dab2ae")
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-bundle: 3 parts total
   transaction abort!
   rollback completed
@@ -601,7 +601,7 @@ fred is allowed inside foo/, but not foo
   acl: path access granted: "ef1ea85a6374"
   acl: branch access granted: "f9cafe1212c8" on branch "default"
   error: pretxnchangegroup.acl hook failed: acl: user "fred" denied on "foo/Bar/file.txt" (changeset "f9cafe1212c8")
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-bundle: 3 parts total
   transaction abort!
   rollback completed
@@ -668,7 +668,7 @@ fred is allowed inside foo/, but not foo
   acl: acl.deny enabled, 0 entries for user barney
   acl: branch access granted: "ef1ea85a6374" on branch "default"
   error: pretxnchangegroup.acl hook failed: acl: user "barney" not allowed on "foo/file.txt" (changeset "ef1ea85a6374")
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-bundle: 3 parts total
   transaction abort!
   rollback completed
@@ -744,7 +744,7 @@ barney is allowed everywhere
   acl: branch access granted: "911600dab2ae" on branch "default"
   acl: path access granted: "911600dab2ae"
   updating the branch cache
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
   pushing key for "phases:911600dab2ae7a9baff75958b84fe606851ce955"
   bundle2-input-bundle: 3 parts total
@@ -826,7 +826,7 @@ wilma can change files with a .txt exten
   acl: path access granted: "f9cafe1212c8"
   acl: branch access granted: "911600dab2ae" on branch "default"
   error: pretxnchangegroup.acl hook failed: acl: user "wilma" not allowed on "quux/file.py" (changeset "911600dab2ae")
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-bundle: 3 parts total
   transaction abort!
   rollback completed
@@ -895,7 +895,7 @@ file specified by acl.config does not ex
   calling hook pretxnchangegroup.acl: hgext.acl.hook
   acl: checking access for user "barney"
   error: pretxnchangegroup.acl hook raised an exception: [Errno 2] No such file or directory: '../acl.config'
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-bundle: 3 parts total
   transaction abort!
   rollback completed
@@ -977,7 +977,7 @@ betty is allowed inside foo/ by a acl.co
   acl: path access granted: "f9cafe1212c8"
   acl: branch access granted: "911600dab2ae" on branch "default"
   error: pretxnchangegroup.acl hook failed: acl: user "betty" not allowed on "quux/file.py" (changeset "911600dab2ae")
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-bundle: 3 parts total
   transaction abort!
   rollback completed
@@ -1062,7 +1062,7 @@ acl.config can set only [acl.allow]/[acl
   acl: branch access granted: "911600dab2ae" on branch "default"
   acl: path access granted: "911600dab2ae"
   updating the branch cache
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
   pushing key for "phases:911600dab2ae7a9baff75958b84fe606851ce955"
   bundle2-input-bundle: 3 parts total
@@ -1148,7 +1148,7 @@ fred is always allowed
   acl: branch access granted: "911600dab2ae" on branch "default"
   acl: path access granted: "911600dab2ae"
   updating the branch cache
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
   pushing key for "phases:911600dab2ae7a9baff75958b84fe606851ce955"
   bundle2-input-bundle: 3 parts total
@@ -1227,7 +1227,7 @@ no one is allowed inside foo/Bar/
   acl: path access granted: "ef1ea85a6374"
   acl: branch access granted: "f9cafe1212c8" on branch "default"
   error: pretxnchangegroup.acl hook failed: acl: user "fred" denied on "foo/Bar/file.txt" (changeset "f9cafe1212c8")
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-bundle: 3 parts total
   transaction abort!
   rollback completed
@@ -1307,7 +1307,7 @@ OS-level groups
   acl: branch access granted: "911600dab2ae" on branch "default"
   acl: path access granted: "911600dab2ae"
   updating the branch cache
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
   pushing key for "phases:911600dab2ae7a9baff75958b84fe606851ce955"
   bundle2-input-bundle: 3 parts total
@@ -1388,7 +1388,7 @@ OS-level groups
   acl: path access granted: "ef1ea85a6374"
   acl: branch access granted: "f9cafe1212c8" on branch "default"
   error: pretxnchangegroup.acl hook failed: acl: user "fred" denied on "foo/Bar/file.txt" (changeset "f9cafe1212c8")
-  bundle2-input-part: total payload size 1606
+  bundle2-input-part: total payload size 1553
   bundle2-input-bundle: 3 parts total
   transaction abort!
   rollback completed
@@ -1509,7 +1509,7 @@ No branch acls specified
   acl: branch access granted: "e8fc755d4d82" on branch "foobar"
   acl: path access granted: "e8fc755d4d82"
   updating the branch cache
-  bundle2-input-part: total payload size 2139
+  bundle2-input-part: total payload size 2068
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
   pushing key for "phases:911600dab2ae7a9baff75958b84fe606851ce955"
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
@@ -1595,7 +1595,7 @@ Branch acl deny test
   acl: branch access granted: "911600dab2ae" on branch "default"
   acl: path access granted: "911600dab2ae"
   error: pretxnchangegroup.acl hook failed: acl: user "astro" denied on branch "foobar" (changeset "e8fc755d4d82")
-  bundle2-input-part: total payload size 2139
+  bundle2-input-part: total payload size 2068
   bundle2-input-bundle: 4 parts total
   transaction abort!
   rollback completed
@@ -1663,7 +1663,7 @@ Branch acl empty allow test
   acl: acl.allow not enabled
   acl: acl.deny not enabled
   error: pretxnchangegroup.acl hook failed: acl: user "astro" not allowed on branch "default" (changeset "ef1ea85a6374")
-  bundle2-input-part: total payload size 2139
+  bundle2-input-part: total payload size 2068
   bundle2-input-bundle: 4 parts total
   transaction abort!
   rollback completed
@@ -1733,7 +1733,7 @@ Branch acl allow other
   acl: acl.allow not enabled
   acl: acl.deny not enabled
   error: pretxnchangegroup.acl hook failed: acl: user "astro" not allowed on branch "default" (changeset "ef1ea85a6374")
-  bundle2-input-part: total payload size 2139
+  bundle2-input-part: total payload size 2068
   bundle2-input-bundle: 4 parts total
   transaction abort!
   rollback completed
@@ -1805,7 +1805,7 @@ Branch acl allow other
   acl: branch access granted: "e8fc755d4d82" on branch "foobar"
   acl: path access granted: "e8fc755d4d82"
   updating the branch cache
-  bundle2-input-part: total payload size 2139
+  bundle2-input-part: total payload size 2068
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
   pushing key for "phases:911600dab2ae7a9baff75958b84fe606851ce955"
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
@@ -1898,7 +1898,7 @@ push foobar into the remote
   acl: branch access granted: "e8fc755d4d82" on branch "foobar"
   acl: path access granted: "e8fc755d4d82"
   updating the branch cache
-  bundle2-input-part: total payload size 2139
+  bundle2-input-part: total payload size 2068
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
   pushing key for "phases:911600dab2ae7a9baff75958b84fe606851ce955"
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
@@ -1982,7 +1982,7 @@ Branch acl conflicting deny
   acl: acl.allow not enabled
   acl: acl.deny not enabled
   error: pretxnchangegroup.acl hook failed: acl: user "george" denied on branch "default" (changeset "ef1ea85a6374")
-  bundle2-input-part: total payload size 2139
+  bundle2-input-part: total payload size 2068
   bundle2-input-bundle: 4 parts total
   transaction abort!
   rollback completed
@@ -2059,7 +2059,7 @@ User 'astro' must not be denied
   acl: branch access granted: "e8fc755d4d82" on branch "foobar"
   acl: path access granted: "e8fc755d4d82"
   updating the branch cache
-  bundle2-input-part: total payload size 2139
+  bundle2-input-part: total payload size 2068
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
   pushing key for "phases:911600dab2ae7a9baff75958b84fe606851ce955"
   bundle2-input-part: "pushkey" (params: 4 mandatory) supported
@@ -2137,7 +2137,7 @@ Non-astro users must be denied
   acl: acl.allow not enabled
   acl: acl.deny not enabled
   error: pretxnchangegroup.acl hook failed: acl: user "george" denied on branch "default" (changeset "ef1ea85a6374")
-  bundle2-input-part: total payload size 2139
+  bundle2-input-part: total payload size 2068
   bundle2-input-bundle: 4 parts total
   transaction abort!
   rollback completed
diff --git a/tests/test-clonebundles.t b/tests/test-clonebundles.t
--- a/tests/test-clonebundles.t
+++ b/tests/test-clonebundles.t
@@ -156,34 +156,32 @@ changes, clone bundles produced by new M
 by old clients.
 
   $ f --size --hexdump full.hg
-  full.hg: size=418
+  full.hg: size=396
   0000: 48 47 32 30 00 00 00 0e 43 6f 6d 70 72 65 73 73 |HG20....Compress|
   0010: 69 6f 6e 3d 47 5a 78 9c 63 60 60 d0 e4 76 f6 70 |ion=GZx.c``..v.p|
   0020: f4 73 77 75 0f f2 0f 0d 60 00 02 46 46 76 26 4e |.swu....`..FFv&N|
   0030: c6 b2 d4 a2 e2 cc fc 3c 03 a3 bc a4 e4 8c c4 bc |.......<........|
-  0040: f4 d4 62 23 06 06 e6 65 40 f9 4d c1 2a 31 09 cf |..b#...e@.M.*1..|
+  0040: f4 d4 62 23 06 06 e6 19 40 f9 4d c1 2a 31 09 cf |..b#....@.M.*1..|
   0050: 9a 3a 52 04 b7 fc db f0 95 e5 a4 f4 97 17 b2 c9 |.:R.............|
   0060: 0c 14 00 02 e6 d9 99 25 1a a7 a4 99 a4 a4 1a 5b |.......%.......[|
   0070: 58 a4 19 27 9b a4 59 a4 1a 59 a4 99 a4 59 26 5a |X..'..Y..Y...Y&Z|
   0080: 18 9a 18 59 5a 26 1a 27 27 25 99 a6 99 1a 70 95 |...YZ&.''%....p.|
   0090: a4 16 97 70 19 28 18 70 a5 e5 e7 73 71 25 a6 a4 |...p.(.p...sq%..|
-  00a0: 28 00 19 40 13 0e ac fa df ab ff 7b 3f fb 92 dc |(..@.......{?...|
-  00b0: 8b 1f 62 bb 9e b7 d7 d9 87 3d 5a 44 ac 2f b0 a9 |..b......=ZD./..|
-  00c0: c3 66 1e 54 b9 26 08 a7 1a 1b 1a a7 25 1b 9a 1b |.f.T.&......%...|
-  00d0: 99 19 9a 5a 18 9b a6 18 19 00 dd 67 61 61 98 06 |...Z.......gaa..|
-  00e0: f4 80 49 4a 8a 65 52 92 41 9a 81 81 a5 11 17 50 |..IJ.eR.A......P|
-  00f0: 31 30 58 19 cc 80 98 25 29 b1 08 c4 37 07 79 19 |10X....%)...7.y.|
-  0100: 88 d9 41 ee 07 8a 41 cd 5d 98 65 fb e5 9e 45 bf |..A...A.].e...E.|
-  0110: 8d 7f 9f c6 97 9f 2b 44 34 67 d9 ec 8e 0f a0 61 |......+D4g.....a|
-  0120: a8 eb 82 82 2e c9 c2 20 25 d5 34 c5 d0 d8 c2 dc |....... %.4.....|
-  0130: d4 c2 d4 c4 30 d9 34 cd c0 d4 c8 cc 34 31 c5 d0 |....0.4.....41..|
-  0140: c4 24 31 c9 32 2d d1 c2 2c c5 30 25 09 e4 ee 85 |.$1.2-..,.0%....|
-  0150: 8f 85 ff 88 ab 89 36 c7 2a c4 47 34 fe f8 ec 7b |......6.*.G4...{|
-  0160: 73 37 3f c3 24 62 1d 8d 4d 1d 9e 40 06 3b 10 14 |s7?.$b..M..@.;..|
-  0170: 36 a4 38 10 04 d8 21 01 9a b1 83 f7 e9 45 8b d2 |6.8...!......E..|
-  0180: 56 c7 a3 1f 82 52 d7 8a 78 ed fc d5 76 f1 36 25 |V....R..x...v.6%|
-  0190: 81 89 c7 ad ec 90 34 48 75 2b 89 49 bf 00 cf 72 |......4Hu+.I...r|
-  01a0: f4 7f                                           |..|
+  00a0: 28 00 19 20 17 af fa df ab ff 7b 3f fb 92 dc 8b |(.. ......{?....|
+  00b0: 1f 62 bb 9e b7 d7 d9 87 3d 5a 44 89 2f b0 99 87 |.b......=ZD./...|
+  00c0: ec e2 54 63 43 e3 b4 64 43 73 23 33 43 53 0b 63 |..TcC..dCs#3CS.c|
+  00d0: d3 14 23 03 a0 fb 2c 2c 0c d3 80 1e 30 49 49 b1 |..#...,,....0II.|
+  00e0: 4c 4a 32 48 33 30 b0 34 42 b8 38 29 b1 08 e2 62 |LJ2H30.4B.8)...b|
+  00f0: 20 03 6a ca c2 2c db 2f f7 2c fa 6d fc fb 34 be | .j..,./.,.m..4.|
+  0100: fc 5c 21 a2 39 cb 66 77 7c 00 0d c3 59 17 14 58 |.\!.9.fw|...Y..X|
+  0110: 49 16 06 29 a9 a6 29 86 c6 16 e6 a6 16 a6 26 86 |I..)..).......&.|
+  0120: c9 a6 69 06 a6 46 66 a6 89 29 86 26 26 89 49 96 |..i..Ff..).&&.I.|
+  0130: 69 89 16 66 29 86 29 49 5c 20 07 3e 16 fe 23 ae |i..f).)I\ .>..#.|
+  0140: 26 da 1c ab 10 1f d1 f8 e3 b3 ef cd dd fc 0c 93 |&...............|
+  0150: 88 75 34 36 75 04 82 55 17 14 36 a4 38 10 04 d8 |.u46u..U..6.8...|
+  0160: 21 01 9a b1 83 f7 e9 45 8b d2 56 c7 a3 1f 82 52 |!......E..V....R|
+  0170: d7 8a 78 ed fc d5 76 f1 36 25 81 89 c7 ad ec 90 |..x...v.6%......|
+  0180: 54 47 75 2b 89 49 b1 00 d2 8a eb 92             |TGu+.I......|
 
   $ echo "http://localhost:$HGPORT1/full.hg" > server/.hg/clonebundles.manifest
   $ hg clone -U http://localhost:$HGPORT full-bundle
diff --git a/tests/test-commit-amend.t b/tests/test-commit-amend.t
--- a/tests/test-commit-amend.t
+++ b/tests/test-commit-amend.t
@@ -120,13 +120,13 @@ No changes, just a different message:
   stripping amended changeset 74609c7f506e
   1 changesets found
   uncompressed size of bundle content:
-       270 (changelog)
+       254 (changelog)
        163 (manifests)
        129  a
   saved backup bundle to $TESTTMP/.hg/strip-backup/74609c7f506e-1bfde511-amend-backup.hg (glob)
   1 changesets found
   uncompressed size of bundle content:
-       266 (changelog)
+       250 (changelog)
        163 (manifests)
        129  a
   adding branch
@@ -264,13 +264,13 @@ then, test editing custom commit message
   stripping amended changeset 5f357c7560ab
   1 changesets found
   uncompressed size of bundle content:
-       258 (changelog)
+       249 (changelog)
        163 (manifests)
        131  a
   saved backup bundle to $TESTTMP/.hg/strip-backup/5f357c7560ab-e7c84ade-amend-backup.hg (glob)
   1 changesets found
   uncompressed size of bundle content:
-       266 (changelog)
+       257 (changelog)
        163 (manifests)
        131  a
   adding branch
@@ -307,13 +307,13 @@ Same, but with changes in working dir (d
   stripping amended changeset 7ab3bf440b54
   2 changesets found
   uncompressed size of bundle content:
-       490 (changelog)
+       464 (changelog)
        322 (manifests)
        249  a
   saved backup bundle to $TESTTMP/.hg/strip-backup/7ab3bf440b54-8e3b5088-amend-backup.hg (glob)
   1 changesets found
   uncompressed size of bundle content:
-       266 (changelog)
+       257 (changelog)
        163 (manifests)
        133  a
   adding branch
diff --git a/tests/test-debugbundle.t b/tests/test-debugbundle.t
--- a/tests/test-debugbundle.t
+++ b/tests/test-debugbundle.t
@@ -16,7 +16,7 @@ Create a test repository:
   $ hg bundle --base 0 --rev tip bundle2.hg -v --type none-v2
   2 changesets found
   uncompressed size of bundle content:
-       372 (changelog)
+       344 (changelog)
        322 (manifests)
        113  b
        113  c
@@ -60,8 +60,8 @@ Verbose output:
       format: id, p1, p2, cset, delta base, len(delta)
   
       changelog
-      0e067c57feba1a5694ca4844f05588bb1bf82342 3903775176ed42b1458a6281db4a0ccf4d9f287a 0000000000000000000000000000000000000000 0e067c57feba1a5694ca4844f05588bb1bf82342 3903775176ed42b1458a6281db4a0ccf4d9f287a 80
-      991a3460af53952d10ec8a295d3d2cc2e5fa9690 0e067c57feba1a5694ca4844f05588bb1bf82342 0000000000000000000000000000000000000000 991a3460af53952d10ec8a295d3d2cc2e5fa9690 0e067c57feba1a5694ca4844f05588bb1bf82342 80
+      0e067c57feba1a5694ca4844f05588bb1bf82342 3903775176ed42b1458a6281db4a0ccf4d9f287a 0000000000000000000000000000000000000000 0e067c57feba1a5694ca4844f05588bb1bf82342 0000000000000000000000000000000000000000 66
+      991a3460af53952d10ec8a295d3d2cc2e5fa9690 0e067c57feba1a5694ca4844f05588bb1bf82342 0000000000000000000000000000000000000000 991a3460af53952d10ec8a295d3d2cc2e5fa9690 0000000000000000000000000000000000000000 66
   
       manifest
       686dbf0aeca417636fa26a9121c681eabbb15a20 8515d4bfda768e04af4c13a69a72e28c7effbea7 0000000000000000000000000000000000000000 0e067c57feba1a5694ca4844f05588bb1bf82342 8515d4bfda768e04af4c13a69a72e28c7effbea7 55
diff --git a/tests/test-largefiles.t b/tests/test-largefiles.t
--- a/tests/test-largefiles.t
+++ b/tests/test-largefiles.t
@@ -1100,7 +1100,7 @@ redo pull with --lfrev and check it pull
   all local heads known remotely
   6 changesets found
   uncompressed size of bundle content:
-      1333 (changelog)
+      1389 (changelog)
       1599 (manifests)
        254  .hglf/large1
        564  .hglf/large3
diff --git a/tests/test-obsolete-changeset-exchange.t b/tests/test-obsolete-changeset-exchange.t
--- a/tests/test-obsolete-changeset-exchange.t
+++ b/tests/test-obsolete-changeset-exchange.t
@@ -145,7 +145,7 @@ client only pulls down 1 changeset
   adding foo revisions
   added 1 changesets with 1 changes to 1 files (+1 heads)
   updating the branch cache
-  bundle2-input-part: total payload size 474
+  bundle2-input-part: total payload size 476
   bundle2-input-part: "listkeys" (params: 1 mandatory) supported
   bundle2-input-part: total payload size 58
   bundle2-input-part: "listkeys" (params: 1 mandatory) supported
diff --git a/tests/test-patchbomb.t b/tests/test-patchbomb.t
--- a/tests/test-patchbomb.t
+++ b/tests/test-patchbomb.t
@@ -352,14 +352,14 @@ test bundle and description:
   Content-Disposition: attachment; filename="bundle.hg"
   Content-Transfer-Encoding: base64
   
-  SEcyMAAAAA5Db21wcmVzc2lvbj1CWkJaaDkxQVkmU1kIqE7KAAAKf//7vFYQWD1/4H7R09C/470I
-  Ak0E4peoSIYIgQCgGUQOcLABGY2hqoTTCYaBqaYAAACaaMAATIwAA1MIYDaQaqn6p+jRop+oJkA2
-  oNqD1PU0PUBoxqaMmjMUepoBoDT1GmQNBKmlTT1GTCNMEAYTQ0NNDI0BoMQHpAZAA8o2pkyNJHfX
-  RRbXoyxKRUlAg41B3lpmMOnr77dEpFKAvEUGEkWuC4wioiMjC2Y2a84EXhsNCFIrbXUGId07PJnS
-  ELAOIpL/gE8R8CUeXuw2NKMtkFoLPkcTSomXtgHSg1IKaCNlWwVU3CpmMYqh5gkFYJKOD4UhVVQ6
-  SiF1DpE8ghWvF1ih+fYgagfYHI96w/QsrRATpYiP7VRbINFrQy2c21mZ7M4pXXrPBypoXAIhtum7
-  aKDJCpUqMDF5dfiDChMfgH9nQ4B60Uvgb4AK9dsbSYc+O3tEyNq9g9gZeA5Je2T82GzjC4DbY4F2
-  0kdrTBwslErFshCgDzeEBwICg13oQaQawQA1WWd3F3JFOFCQCKhOyg==
+  SEcyMAAAAA5Db21wcmVzc2lvbj1CWkJaaDkxQVkmU1nYvy2xAAAJf//7vFYQXD1/4H7R09C/470I
+  Ak0E4pe4SIIIgQSgGEQOcLAA5VBKqeppMxTI0YjQNBgQMQDI0GgMhtR6I0GI2p6I0yeSEVT9MiYn
+  qjCYQwCBtARptARgBNDEwAGiDCMA40NGjQaNA0AAAAADIAAAA0BkABktCk6qObVxZ2A/33KHibLr
+  UQ4BwkgcPcmuCUAQZCztIWgR1SpBS6IqbIij4UFwhnnMkElcFTqoucIWbsBPK3l+6c+xYaVBWsJo
+  aT0OV/YAOvLrziifDQMJOMIaaYce9agtI2EwQBAq089UiRU+evFHSLRBT7Wa/D/YBaUtU5ezvtr3
+  6yrIS4Iyp9VWESdWPEi6VjRjdcEY4HvbmDIVEAEVJIUrHNIBx/MmnBBRkw8tSlCQ8ABZxf5ejgBI
+  pP5TSQPLVMYbq1qbBPmWN0LYVlAvRbP4X512kDQZ9y4TQbvoZmhe+54sRsEJ8GW3hMJjERh0NNlg
+  aB+3Cw/4u5IpwoSGxfltiA==
   --===============*==-- (glob)
 
 with a specific bundle type
diff --git a/tests/test-phases-exchange.t b/tests/test-phases-exchange.t
--- a/tests/test-phases-exchange.t
+++ b/tests/test-phases-exchange.t
@@ -765,7 +765,7 @@ Bare push with next changeset and common
   searching for changes
   1 changesets found
   uncompressed size of bundle content:
-       192 (changelog)
+       178 (changelog)
        165 (manifests)
        131  a-H
   adding changesets
diff --git a/tests/test-push-warn.t b/tests/test-push-warn.t
--- a/tests/test-push-warn.t
+++ b/tests/test-push-warn.t
@@ -150,7 +150,7 @@ Specifying a revset that evaluates to nu
   searching for changes
   2 changesets found
   uncompressed size of bundle content:
-       348 (changelog)
+       352 (changelog)
        326 (manifests)
        253  foo
   adding changesets
diff --git a/tests/test-rebase-conflicts.t b/tests/test-rebase-conflicts.t
--- a/tests/test-rebase-conflicts.t
+++ b/tests/test-rebase-conflicts.t
@@ -303,7 +303,7 @@ Check that the right ancestors is used w
   adding file changes
   adding f1.txt revisions
   added 2 changesets with 2 changes to 1 files
-  bundle2-input-part: total payload size 1713
+  bundle2-input-part: total payload size 1686
   bundle2-input-bundle: 0 parts total
   invalid branchheads cache (served): tip differs
   history modification detected - truncating revision branch cache to revision 9
diff --git a/tests/test-rebase-mq-skip.t b/tests/test-rebase-mq-skip.t
--- a/tests/test-rebase-mq-skip.t
+++ b/tests/test-rebase-mq-skip.t
@@ -70,14 +70,14 @@ already has one local mq patch
   $TESTTMP/a/.hg/patches/p0.patch (glob)
   2 changesets found
   uncompressed size of bundle content:
-       384 (changelog)
+       348 (changelog)
        324 (manifests)
        129  p0
        129  p1
   saved backup bundle to $TESTTMP/a/.hg/strip-backup/13a46ce44f60-5da6ecfb-backup.hg (glob)
   2 changesets found
   uncompressed size of bundle content:
-       439 (changelog)
+       403 (changelog)
        324 (manifests)
        129  p0
        129  p1
diff --git a/tests/test-rebase-newancestor.t b/tests/test-rebase-newancestor.t
--- a/tests/test-rebase-newancestor.t
+++ b/tests/test-rebase-newancestor.t
@@ -304,13 +304,13 @@ rebase of merge of ancestors
   rebase merging completed
   1 changesets found
   uncompressed size of bundle content:
-       213 (changelog)
+       199 (changelog)
        216 (manifests)
        182  other
   saved backup bundle to $TESTTMP/parentorder/.hg/strip-backup/4c5f12f25ebe-f46990e5-backup.hg (glob)
   1 changesets found
   uncompressed size of bundle content:
-       272 (changelog)
+       254 (changelog)
        167 (manifests)
        182  other
   adding branch