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Date: Fri, 7 Mar 2008 03:45:26 +0800
From: "Tz-Huan Huang" <tzhuan@csie.org>
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Subject: Slow timer of 7-stable on IBM x3550
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Hi,

We have a IBM x3550 running 7-stable. The timer is 4x~5x slower than
it should be,
for example:

$ time sleep 1

real    0m4.979s
user    0m0.000s
sys     0m0.000s
$ time sleep 2

real    0m9.949s
user    0m0.000s
sys     0m0.000s

The kernel is csup'd and built today: (sys/dev/aic7xxx/aic79xx_osm.c
is replaced by
version 1.32 from 8-current to avoid some ahd problems)

$ uname -a
FreeBSD cml2 7.0-STABLE FreeBSD 7.0-STABLE #0: Fri Mar  7 03:02:06 CST 2008
root@cml2:/tmp2/usr/src/sys/CML2  amd64

dmesg: http://w.csie.org/~tzhuan/tmp/dmesg.txt
sysctl: http://w.csie.org/~tzhuan/tmp/sysctl.txt
kernel config: http://w.csie.org/~tzhuan/tmp/kern.config

Any comments? Thanks a lot.

Tz-Huan