Messages in this thread | | | Subject | SMP cpu deep sleep | From | Hans Kristian Rosbach <> | Date | Fri, 20 Aug 2004 10:06:47 +0200 |
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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
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