Weird growth in packfile during initial push

["Robin H. Johnson" <robbat2@gentoo.org>]

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I was doing a more recent conversion of the Gentoo repo, and ran into
some odd behavior in the packfile size.

For anybody else following the repo, you can now get it on the new hardware at:
http://git-exp.overlays.gentoo.org/gitweb/?p=exp/gentoo-x86.git;a=summary

I did the conversion with cvs2svn, packed, added the remote and pushed, only to
find that the pack on the remote side suddenly seemed to be ~60MiB larger.

$ time git repack -adf --window=250 --depth=250
real    19m59.339s
user    96m48.011s
sys     0m36.914s

$ ls -la /tmp/convert/gentoo-x86-cvs2git/.git/objects/pack
total 903804
drwxr-xr-x 2 robbat2 users       119 Apr 14 08:05 .
drwxr-xr-x 4 robbat2 users        28 Apr 14 08:05 ..
-r--r--r-- 1 robbat2 users 139155472 Apr 14 08:05 pack-f805bb448f864becfeac9c7f8a8ac2ef90c26787.idx
-r--r--r-- 1 robbat2 users 786336481 Apr 14 08:05 pack-f805bb448f864becfeac9c7f8a8ac2ef90c26787.pack

$ git remote add origin git+ssh://git@git-exp.overlays.gentoo.org/exp/gentoo-x86.git
$ git push origin master:master
Initialized empty Git repository in /var/gitroot/exp/gentoo-x86.git/
Counting objects: 4969800, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (1217809/1217809), done.
Writing objects: 100% (4969800/4969800), 810.56 MiB | 21608 KiB/s, done.
Total 4969800 (delta 3735812), reused 4969800 (delta 3735812)
To git+ssh://git@git-exp.overlays.gentoo.org/exp/gentoo-x86.git
 * [new branch]      master -> master

$ ls -la /var/gitroot/exp/gentoo-x86.git/objects/pack
total 966876
drwxr-xr-x 2 git git      4096 Apr 14 08:43 .
drwxr-xr-x 4 git git      4096 Apr 14 08:35 ..
-r--r--r-- 1 git git 139155472 Apr 14 08:43 pack-f805bb448f864becfeac9c7f8a8ac2ef90c26787.idx
-r--r--r-- 1 git git 849936308 Apr 14 08:43 pack-f805bb448f864becfeac9c7f8a8ac2ef90c26787.pack

On the client side after the initial clone, it DOES match (in size) what was
cloned.

(If you're looking for the 849MB one right now, I'll have to get it back for
you, I wanted to save that extra space so just did an rsync of the other pack
over the too-large one for now).

-- 
Robin Hugh Johnson
Gentoo Linux Developer & Infra Guy
E-Mail     : robbat2@gentoo.org
GnuPG FP   : 11AC BA4F 4778 E3F6 E4ED  F38E B27B 944E 3488 4E85

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