Re: gen6 (SNB) GPU still stalling besides latest patches

["Nicolas Kalkhof" <nkalkhof@web.de>]

Hello!

sorry, setting i915.enable_rc6=0 didn't work for me. I've filed a bug:
https://bugs.freedesktop.org/show_bug.cgi?id=38529

thanks and regards
nico


-----Ursprüngliche Nachricht-----
Von: "Nicolas Kalkhof" <nkalkhof@web.de>
Gesendet: Jun 21, 2011 7:59:51 AM
An: intel-gfx@lists.freedesktop.org
Betreff: Re: [Intel-gfx] gen6 (SNB) GPU still stalling besides latest patches

>Hi Folks,
>ok, I'll give it a try this evening. Just one more thing: Should I pass enable_rc6 as a boot parameter like this: "i915.enable_rc6=0" or is it set by echoing sysfs (/sys/module/i915/parameters/...)?
>
>regards, nico
>
>
>-----Ursprüngliche Nachricht-----
>Von: "Jesse Barnes" <jbarnes@virtuousgeek.org>
>Gesendet: Jun 21, 2011 2:19:29 AM
>An: "Ted Phelps" <phelps@gnusto.com>
>Betreff: Re: [Intel-gfx] gen6 (SNB) GPU still stalling besides latest patches
>
>>On Tue, 21 Jun 2011 10:01:35 +1000
>>Ted Phelps <phelps@gnusto.com> wrote:
>>
>>>
>>> Hi Nicolas,
>>>
>>> Nicolas Kalkhof writes:
>>> > SNB GPU still hangs frequently with kernel patches next-20110620
>>> > raising "drm:i915_hangcheck_ring_idle *ERROR* Hangcheck timer
>>> > elapsed... gen6 bsd ring idle". This happens when multiple
>>> > applications (mplayer decoding vaapi stream and some openGL game)
>>> > running at the same time. With either one running there is no
>>> > stalling. Could someone please confirm the issue?
>>> >
>>> > /sys/module/i915/parameters/semaphores is set to 0
>>> > xf86-video-intel compiled with --enable-sna
>>>
>>> I haven't tried SNA, but I've seen GPU hangs as well (SNB 2600K). I've
>>> found that disabling RC6 (enable_rc6=0) seems to help. Can you see if
>>> that helps?
>>>
>>> [Note to self: submit a bug report]
>>
>>Please do; and please try to confirm that your GPU hangs are really rc6
>>related. RC6 provides a huge (multiple Watt) power savings, and we
>>really want it to be robust.
>>
>>--
>>Jesse Barnes, Intel Open Source Technology Center
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