[TSVN] weird performance problem

Hello,

I'm cc'ing both svndev and tsvndev lists as I'm not sure to which this
really belongs. I was hoping you guys could help me figure it out.

My setup
=========
Server:
Solaris 8 on SPARC-UE
svn 1.1.0rc4
apache 2.0.49
Everything compiled for 64-bit with -fast -xarch=v9
Test Repos: have a bdb and a fsfs copy of the same rep. About 120 MB
in size. 3 modules imported, multiple branches and tags. About 110
revisions so far. One of the modules is the Squirrelmail source tree,
which I'll use as an example.

Client:
Windows 2000 Professional SP4 fully patched
svn1.1.0rc4 precompiled command line client.
TortoiseSVN 1.1.0RC2 built against svn 1.1.0rc3 downloaded from the
tsvn website.

Network:
Client -> 100 Mbit LAN -> Server
Client -> 2 Mbit line -> Internet

My problem
===========
My problem basically is that when I'm browsing the repository with
TSVN's repo browser and I click on the [+] to expand a dir, the more
subdirs it has, the longer it takes. For example, expanding the
squirrelmail source tree at the root takes about 35 seconds. Here's a
list of the tests I've made:

Browsing
* TSVN browsing my server via http, expanding the squirrelmail trunk. 35 secs.
* TSVN browsing my server via svn://. Lightning fast, sub-second
response to all dir expansions.
* TSVN browsing http://svn.collab.net/repos/svn. Click to expand the
trunk. 5 secs.

Checkout/Commit/Log
* All combinations of clients and servers perform very well.

Web performance
* Browsing the rep with ViewCVS-dev august snapshot has good
performance. Click on /trunk of the Squirrelmail module and the
response time is roughly 1-2 seconds if visiting for the first time.
The Apache install is solely for svn purposes. The tests were
performed at a time when my server had very little load in general.

The apache logs show the following:
*** Click to expand the 20040917 folder ***
128.11.30.2 - - [25/Sep/2004:11:49:13 -0500] "PROPFIND
/svnrep/banistmo_lobby/prod/20040917 HTTP/1.1" 207 728
128.11.30.2 - - [25/Sep/2004:11:49:13 -0500] "PROPFIND
/svnrep/!svn/vcc/default HTTP/1.1" 207 396
128.11.30.2 - - [25/Sep/2004:11:49:13 -0500] "PROPFIND
/svnrep/!svn/bln/109 HTTP/1.1" 207 451
128.11.30.2 - - [25/Sep/2004:11:49:14 -0500] "PROPFIND
/svnrep/banistmo_lobby/prod/20040917 HTTP/1.1" 207 728
128.11.30.2 - - [25/Sep/2004:11:49:14 -0500] "PROPFIND
/svnrep/!svn/vcc/default HTTP/1.1" 207 451
128.11.30.2 - - [25/Sep/2004:11:49:14 -0500] "PROPFIND
/svnrep/!svn/bc/109/banistmo_lobby/prod/20040917 HTTP/1.1" 207 740
128.11.30.2 - - [25/Sep/2004:11:49:14 -0500] "PROPFIND
/svnrep/banistmo_lobby/prod/20040917 HTTP/1.1" 207 728
128.11.30.2 - - [25/Sep/2004:11:49:14 -0500] "PROPFIND
/svnrep/!svn/vcc/default HTTP/1.1" 207 451
 
*wait* *wait* *wait* *wait* *wait* *wait* *wait* *wait* *wait*
 
128.11.30.2 - - [25/Sep/2004:11:49:14 -0500] "PROPFIND
/svnrep/!svn/bc/109/banistmo_lobby/prod/20040917 HTTP/1.1" 207 42212
*** folder expanded ***

So what I need to do is to improve the repo browsing performance onver
HTTP on my server, to at least match the 5 seconds I get with the svn
repos over the internet. Using svnserve, unfortunately is not an
option as we depend on mod_auth_mysql for user validation. How can I
find out what's slowing the folder expansion down?

Many thanks for any insights on this problem.

Ariel

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