Quoting Alexander Motin <m...@freebsd.org> (from Sun, 29 Aug 2010
16:10:00 +0300):
I have actively tested this code for a few days on my amd64 Core2Duo
laptop and i386 Core-i5 desktop system. With C2/C3 states enabled
systems experience only about 100-150 interrupts per second, having HZ
set to 1000. These events mostly caused by several event-greedy
processes in our tree. I have traced and hacked several most aggressive
ones in this patch: http://people.freebsd.org/~mav/tm6292_idle.patch .
It allowed me to reduce down to as low as 50 interrupts per system,
including IPIs!
It looks like you are comming to a point where Powertop would be
helpful. There's a dtracified version of it available at the
opensolaris site (it would at least need some additional dtrace probes
in our kernel).
http://hub.opensolaris.org/bin/view/Project+tesla/Powertop
Bye,
Alexander.
--
Our customers' paperwork is profit.
Our own paperwork is loss.
http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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