[Intel-gfx] wakeups/sec from i915 gen6_pm_rps_work
jbarnes at virtuousgeek.org
Mon Nov 4 21:00:41 CET 2013
On Mon, 4 Nov 2013 19:27:31 +0000
"Chilukuri, Harita" <harita.chilukuri at intel.com> wrote:
> Hi All,
> I am running Aquarium workload (WebGL) on Chromium OS. From the powertop data, I do see 277.9 overall GPU ops/second and 166.6 ops/sec from gen6_pm_rps_work.
> Are the above ops/sec in normal range? Can someone let me know what the primary purpose of this function is and how I can reduce the wakeups from it?
We kick off that work when we get an interrupt from the GPU requesting
a frequency increase or decrease.
We could reduce the frequency of the interrupt (or get rid of it
entirely) a couple of different ways:
- adjust the thresholds and/or evaluation intervals to make freq
changes less frequent (and thus less responsive to changes in load)
- make the changes sloppy and batch them up (effectively the same
thing as above but in sw, and we'd still take the interrupts)
- use a polling scheme to evaluate busyness, and adjust the freq at a
fixed rate at specific times, maybe using a 60Hz timer or something
while the GPU is busy
Jesse Barnes, Intel Open Source Technology Center
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