2 x quad-core system is slower that 2 x dual core on FreeBSD
kris at FreeBSD.org
Mon Nov 19 10:46:41 PST 2007
Alexey Popov wrote:
> Ivan Voras wrote:
>>> CPU states: 9.5% user, 0.0% nice, 82.0% system, 0.5% interrupt, 8.0%
>> A wild idea that might not help: try reducing kern.hz in loader.conf to
>> something like 100 and see if something significant changes.
> Now it runs with hz=100, number of context switches became ~ 2 times
> less, but still there's 90% system CPU load (see attach).
System CPU usage doesn't tell you anything by itself, you need to look
at how much work the system is actually doing (pages served/second, or
whatever). For example, when your kernel is getting more work done,
system CPU usage will also be higher.
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