Re: tuning a VERY heavily (30.0) loaded s cerver

[Michael C . Wu]

Just an update on the lovely loaded BBS server. 
We made our record-breaking number of users last night.

After implementing the changes suggested, and kqueue'ifying 
the BBS daemon.  We saw a dramatic increase in server power.

Top number of users was 4704 users.  Serving SSH, HTTP, SMTP, innd, BBSD
with no delays.  (Meanwhile, we had kernel profiling ON :) )
We had peak load averages of 100.0, read: no delay.  I am certain
that we could taken on 6000 users had we had that many users.
(It died due to unrelated reason, not because of the load since the
number of users had gone down to 4400.)   iostat became a fraction of what
it used to be before we set vfs.vmiodirenable=1.

(Why is vfs.vmiodirenable=1 not enabled by default?)

We used to die at about 4200 users with average loads of 200.0 even 300.0
For those still interested in kq'ed BBSD stats:
http://zoo.ee.ntu.edu.tw/~keichii

I'm ponder if this should have been posted to FreeBSD-Advocacy. :^)

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