Re: [RFC][PATCH 0/8] load-balancing and cpu_power -v2

From: Peter Zijlstra
Date: Thu Sep 03 2009 - 09:39:11 EST

On Thu, 2009-09-03 at 14:10 +0200, Andreas Herrmann wrote:
> On Tue, Sep 01, 2009 at 10:34:31AM +0200, Peter Zijlstra wrote:

> > Anyway, have at it, poke holes and report issues.
> Tested it (to a certain extend).
> Found no performance degradation (on 1P, 2P, 4P systems). (One could
> think performance might slightly degrade due to more frequent
> __cpu_power updates).


> This applies to modification of sched_mc_power_savings. And I think
> one of above scenarios is already broken in tip/master w/o your
> patches.

I suspect so, but confirmation would be good, I don't have a single
machine large enough to actually test any of that power saving muck.

> Otherwise especially wrt to integration of APERF/MPERF this seems to
> be a good approach.

On that, are there AMD systems supporting APERF/MPERF? I only know of
Intel machines doing so.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at