[Intel-gfx] [PATCH] drm/i915: Adjustable Render Power State policies

[Zhang, Ouping]

HI Chris,

I retested idle power, idle power is the same(12.5 w) with patch and without patch. maybe the machine is unstable after plugged in power.


> -----Original Message-----
> From: Chris Wilson [mailto:chris at chris-wilson.co.uk]
> Sent: Thursday, August 01, 2013 3:44 PM
> To: Zhang, Ouping
> Cc: Jesse Barnes; intel-gfx at lists.freedesktop.org; Meng, Mengmeng; Jin,
> Gordon
> Subject: Re: [Intel-gfx] [PATCH] drm/i915: Adjustable Render Power State
> policies
> 
> On Thu, Aug 01, 2013 at 05:15:36AM +0000, Zhang, Ouping wrote:
> > Test patch on Harris Beach,
> > max frequency: 1100
> > lowest frequency : 200
> >
> > For doom3, When waking from idle, boost the render frequency to RP1(200).
> At every upclock request, increase to halfway between the current frequency
> and maximum. attached the frequency changing of doom3.
> > Applied the patch, performance improved, but consumed more power, except
> smokin-guns workload, performance improved and consumed less power.
> 
> Hmm, the plan was not to affect idle power consumption. Can you log
> measured frequency and rc6 state whilst idle? I wonder if something is
> preventing the system from idling. Maybe we need something like perf
> timechart to measure wakeups over time.
> -Chris
> 
> --
> Chris Wilson, Intel Open Source Technology Centre