On Tue, 2009-03-24 at 00:15 +0000, Peter Clifton wrote:
[snip]
> Here's a really fun discovery.. I ran a short test program to busy-loop
> the CPU. This is with the "performance" governer. After running one
> copy, my glxgears fps appeared to increase. Curious, I spawned a second
> copy (I have 2 cores of CPU). glxgears fps increased again! (to
> ~950fps). Just for completeness' sake, I'll note that a third copy slows
> it down again somewhat.
>
> The busy-loop programs are keeping the CPU from idling, and perhaps
> somehow the residency of lower C states is giving rise to the lower
higher ____^
> frame-rates (in spite the CPU being otherwise busy).
(had originally started to phrase this the other way around.. perhaps
higher C states are causing latency -> lower frame-rates).
--
Peter Clifton
Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA
Tel: +44 (0)7729 980173 - (No signal in the lab!)
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