Summary: | [snb regression] retuned rc6 values cause power regression | ||
---|---|---|---|
Product: | DRI | Reporter: | nkalkhof |
Component: | DRM/Intel | Assignee: | Jani Nikula <jani.nikula> |
Status: | CLOSED INVALID | QA Contact: | Intel GFX Bugs mailing list <intel-gfx-bugs> |
Severity: | normal | ||
Priority: | medium | CC: | intel-gfx-bugs |
Version: | unspecified | ||
Hardware: | x86-64 (AMD64) | ||
OS: | Linux (All) | ||
See Also: | https://bugs.freedesktop.org/show_bug.cgi?id=72924 | ||
Whiteboard: | |||
i915 platform: | i915 features: |
Description
nkalkhof
2013-09-01 10:02:41 UTC
Can you please check with e.g. powertop what the rc6 residency values are for your given workload with and without the offending patch? Just to confirm what's going on. Chris this smells like a candidate for your patches ... So if you apply http://cgit.freedesktop.org/~ickle/linux-2.6/commit/?h=perf (and build with i915.ko builtin), use xf86-video-intel-2.15+ with SNA, and the lastest checkout of intel-gpu-tools, you get not only a new set of *rps* tweaks but also intel-gpu-overlay to show realtime GPU usage and power consumption. I'd be interested in seeing how the rps tweaks interact with your system (for libva, I can only imagine things get worse). [Not yet integrated into intel-gpu-tools is the ability to record a power usage profile for later analysis - it should be possible through perf, but I haven't finished checking to make sure it works.] Poke for updated power measurements. Reporter not responding, closing. Please reopen if the problem persists. |
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