Too much data being downloaded with sftp

[Sowers, Brent - ES]

I'm using sftp with Bazaar to push, pull, branch, and checkout from branches on our central server.  I've noticed that the amount of data transferred when checking out or branching to a new system has been getting bigger and bigger.  I just upgraded to 2.2.0 thinking that maybe this would fix the problem, but a ton of data is still being transferred, maybe more than with 2.1.0.  My repository isn't too big, maybe 300 commits total, and when I look at the disk usage on the server, the directory containing the entire repository is around 20 megs.  But when I do a checkout from one of the branches on to a new system, the total amount of data transferred is 430 megs!

I ran a checkout on a new system with -Dhpss on the command line, and here is what gets put in to my .bzr.log.  I've substituted the server name here.  The repository name is lp.
Thu 2010-09-09 11:11:15 -0400
0.221  bazaar version: 2.2.0
0.221  bzr arguments: [u'checkout', u'sftp://www.server-name.com/opt/bzr/lp/brent/refactor', u'lp', u'-Dhpss']
0.334  looking for plugins in /home/brent/.bazaar/plugins
0.334  looking for plugins in /usr/lib/python2.5/site-packages/bzrlib/plugins
0.571  encoding stdout as sys.stdout encoding 'UTF-8'
0.721  ssh implementation is OpenSSH
3.758  creating repository in file:///opt/lh/lp/.bzr/.
3.761  creating branch <bzrlib.branch.BzrBranchFormat7 object at 0x858a74c> in file:///opt/lh/lp/
3.875  Using fetch logic to copy between CHKInventoryRepository('sftp://www.server-name.com/opt/bzr/.bzr/repository/')(RepositoryFormat
2a()) and CHKInventoryRepository('file:///opt/lh/lp/.bzr/repository/')(RepositoryFormat2a())
3.875  fetch up to rev {brent.sowers at itt.com-20100908193331-ymgpwwif2a13htxm<mailto:%7Bbrent.sowers at itt.com-20100908193331-ymgpwwif2a13htxm>}
10.733  Adding the key (<bzrlib.btree_index.BTreeGraphIndex object at 0x8b6ed2c>, 364238, 3507449) to an LRUSizeCache failed. value 87303229 is too big to fit in a the cache with size 41943040 52428800
... the previous line is repeated a ton of times. The numbers are the exact same on every line ...
44.195  Adding the key (<bzrlib.btree_index.BTreeGraphIndex object at 0x8b6ed2c>, 364238, 3507449) to an LRUSizeCache failed. value
87303229 is too big to fit in a the cache with size 41943040 52428800
49.617  trying to create missing lock '/opt/lh/lp/.bzr/checkout/dirstate'
49.618  opening working tree '/opt/lh/lp'
51.234  Transferred: 431148kB (8913.1kB/s r:431148kB w:0kB)
51.234  return code 0
Any help on what's going on here would be appreciated.  Going over a gigabit LAN as I was for this example isn't too much of a hassle, but doing this over a T1 line is excruciating.  I just don't understand how so much data is being transferred when the entire repository on the server is only 20 megs.

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