From: Hans Kristian Rosbach <hk@isphuset.no>
To: linux-kernel@vger.kernel.org
Subject: SMP cpu deep sleep
Date: Fri, 20 Aug 2004 10:06:47 +0200 [thread overview]
Message-ID: <1092989207.18275.14.camel@linux.local> (raw)
While reading through hotplug and speedstep patches
I came to think of a feature I think might be useful.
In an SMP system there are several cpus, this generates
extra heat and power consuption even on idle load.
Is there a way to put all cpus but cpu1 into a kind of
deep sleep? Cpu1 would have to do all work (including irqs)
of course.
We have a lot of SMP systems that we host, and they
are heavily used ~10 hours of the day, the rest they are
mostly idle. They could run on only 1 cpu during lenghty
idle periods.
If it is possible to put cpus to a deeper sleep than
just the simple idle, then the kernel could make use of this.
It would be a cool feature.
Sincerly
Hans K. Rosbach
next reply other threads:[~2004-08-20 8:09 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-20 8:06 Hans Kristian Rosbach [this message]
2004-08-20 8:58 ` SMP cpu deep sleep Jeff Sipek
2004-08-20 9:42 ` Hans Kristian Rosbach
2004-08-20 14:38 ` Zwane Mwaikambo
2004-08-20 16:44 ` Wes Felter
2004-08-21 0:53 ` Benjamin Herrenschmidt
2004-08-23 21:30 ` Bill Davidsen
2004-08-28 19:15 ` Alan Cox
2004-08-24 22:48 ` Pavel Machek
-- strict thread matches above, loose matches on Subject: below --
2004-08-20 14:30 Nakajima, Jun
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