On 2012-08-01 03:06, Chris Wilson wrote:
On Wed, 01 Aug 2012 10:38:36 +0100, James Bottomley
<james.bottom...@hansenpartnership.com> wrote:
On Wed, 2012-08-01 at 09:58 +0100, Chris Wilson wrote:
> On Wed, 01 Aug 2012 09:45:04 +0100, James Bottomley
<james.bottom...@hansenpartnership.com> wrote:
> > On Wed, 2012-08-01 at 09:16 +0100, Chris Wilson wrote:
> > > On Wed, 01 Aug 2012 09:06:12 +0100, James Bottomley
<james.bottom...@hansenpartnership.com> wrote:
> > > > I got the attached to apply and it doesn't really improve
the idle power
> > > > much (12.5W).
> > >
> > > That's good to know. Next step is to try overriding
i915.semaphores.
> > > Can you please test with i915.semaphores=0 and
i915.semaphores=1?
> >
> > There's not much point doing i915_semaphores=1 since that's the
default
> > on gen 6 hardware, but i915_semaphores=0 recovers and idle power
of
> > ~6.5W
>
> It is only the default if iommu is off, and changing the default
> was one of the side-effects of the patch you bisected.
>
> Can you please login to the desktop, let it idle, record
> /sys/kernel/debug/dri/0/i915_cur_delayinfo and .../i915_drpc_info.
> Then trace-cmd record -e i915 sleep 10s,
OK, what is trace-cmd? It looks similar to perf tools ... is that
it?
Yes, it is roughly equivalent and you should be able to achieve the
same
with perf trace - except I haven't done it before so I don't have
quick
advice on how to drive it. :)
-Chris
Should be something like:
perf record -f -g -e i915:* -a
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