Also make sure that your MySQL is not 5.1.23 from packages or ports. I had an issue with the sorting of large result sets losing rows. I had the issue on both i386 and amd64. DBMail did all kinds a weird things such as messages not showing up at all when headers were downloaded.

I'm glad that the new kernel is working better.

-Jon

[EMAIL PROTECTED] wrote:
Thanks Jon and all others for your great suggestions.

As Jon said, I'm drawing towards the conclusion that the issue was with some 
bug or incompatibility between FreeBSD 7 and MySql 5.1. FreeBSD 7 has a new 
scheduler but by default it still uses the older one. Things seemed to be much 
better after we recompiled the kernel with the new scheduler.

Also - My custom kernel config has to following non-standard options

options         HZ=2000
options         SCHED_ULE               # ULE scheduler
options         PREEMPTION              # Enable kernel thread preemption
options         FULL_PREEMPTION         # Enable kernel thread preemption
options         IPI_PREEMPTION          # Enable kernel thread preemption
options         SMP

Khanh
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