On 2012-08-01 03:06, Chris Wilson wrote: > On Wed, 01 Aug 2012 10:38:36 +0100, James Bottomley > <James.Bottomley at 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.Bottomley at 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.Bottomley at 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
