Samba slows down/crashes with more than 50 users

We have a XServe Dual G5 with 2GB RAM running only Open Directory & SMB for a network of 150 Windows XP Pro workstations. Everything works fine if we have < 30 users logon at once, but if 40-50 users try the server just goes belly up.
We've upgraded to 10.5.2 but that didn't seem to help at all. The CPUs never go above 70% utilization, the network traffic is very low, and it always has about a GB of memory left. Does anyone else have any clues? I've included the top part one of the CrashReporter logs for samba.
============================SNIP===========================
Process: smbd [17855]
Path: /usr/sbin/smbd
Identifier: smbd
Version: ??? (???)
Code Type: PPC (Native)
Parent Process: smbd [1592]
Date/Time: 2008-02-13 08:31:52.812 -0500
OS Version: Mac OS X Server 10.5.2 (9C31)
Report Version: 6
Exception Type: EXCBADACCESS (SIGABRT)
Exception Codes: KERNPROTECTIONFAILURE at 0x0000000000000000
Crashed Thread: 0
Application Specific Information:
internal error
* single-threaded process forked *
Thread 0 Crashed:
0 libSystem.B.dylib 0x92f4acb8 __kill + 12
1 libSystem.B.dylib 0x92fef7c4 abort + 84
2 smbd 0x001b2a34 dump_core + 368
3 smbd 0x001c548c smb_panic + 400
4 smbd 0x001b2634 debugparselevels + 1300
Thread 0 crashed with PPC Thread State 32:
srr0: 0x92f4acb8 srr1: 0x0200f030 dar: 0x1e876000 dsisr: 0x42000000
r0: 0x00000025 r1: 0xbfffda90 r2: 0x00000008 r3: 0x00000000
r4: 0x00000000 r5: 0x00000001 r6: 0x80808080 r7: 0x00000000
r8: 0x00000000 r9: 0x00000000 r10: 0x92f13c90 r11: 0xa0518490
r12: 0x92f4aca4 r13: 0x00020000 r14: 0x00000000 r15: 0x00000230
r16: 0x01202980 r17: 0x00000000 r18: 0x00000000 r19: 0x003149a0
r20: 0x00020000 r21: 0x0052c000 r22: 0x00000002 r23: 0x0054d000
r24: 0x01804030 r25: 0x00000003 r26: 0x002d3688 r27: 0x002d3698
r28: 0x002d37bc r29: 0x0031530c r30: 0x003211a4 r31: 0x92fef77c
cr: 0x42004252 xer: 0x00000000 lr: 0x92fef7c8 ctr: 0x92f4aca4
vrsave: 0x00000000

Just to close this out: the answer was it wasn't the Xserve at all. It turns out the Windows clients were running an anti-virus program that was scanning the network drives on login. So, when they all logged in simultaneously they hit the Xserve with 50 scans and it was so busy dealing with the load that it couldn't process the logins for the others.
Unfortunately we didn't find this out until the Teacher was completely feed up with the Apple unit and removed it from the school (to put it politely). When the new (Linux based) unit exhibited the same slowdown, we figured it must be with the Windows clients. After we turned off the anti-virus network drive scan, everything got much better.
So, while this does have a happy ending (the network works) it did involve an Apple casualty. I tried my best, but maybe this post will help someone else that find themselves in the same predicament.
Later...
Richard

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