On Wed, Aug 01, 2012 at 11:08:19AM +0100, James Bottomley 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@xxxxxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxx> 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, and follow up with a new pair > > of /sys/kernel/debug/dri/0/i915_cur_delayinfo and .../i915_drpc_info. > > > > This will let us see whether the pm counters are truly advancing and > > what activity the driver is performing whilst idle. > > OK, so here it is > > James Hm, if I haven't botched the math, you have a rc6 residency of about 320 seconds between the two cats of drpc_info. Can you please script this so that we have exactly 10s in between? (Aside: 3.6 has a neat interface for rc6 residency in sysfs ...) Also, you need to attach the output of trace-cmd report (like with perf), so that we see the tracepoints in detail. Another quick thing to confirm: What is the power consumption on the old kernel when booting with i915.i915_semaphores=1? Thanks, Daniel -- Daniel Vetter Mail: daniel@xxxxxxxx Mobile: +41 (0)79 365 57 48 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
