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

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

Hi Jesse,

thanks for the infiormation. I've switched rc6 off by
echo 0 > /sys/module/i915/parameters/i915_enable_rc6
this should do it, right?
cat /sys/module/i915/parameters/i915_enable_rc6 yields "0"

Are you referring to this patch? https://lkml.org/lkml/2011/6/17/371
It should be included in kernel 3.0-rc4 and didn't help here :(

regards
nico



-----Ursprüngliche Nachricht-----
Von: "Jesse Barnes" <jbarnes@virtuousgeek.org>
Gesendet: Jun 21, 2011 6:06:17 PM
An: "Nicolas Kalkhof" <nkalkhof@web.de>, intel-gfx@lists.freedesktop.org
Betreff: Re: [Intel-gfx] gen6 (SNB) GPU still stalling besides latest patches

>It's i915.i915_enable_rc6=0 for extra added redundancy. You might also
>try Daniel Blueman's IRQ fix.
>
>Jesse
>
>On Tue, 21 Jun 2011 07:57:13 +0200 (CEST)
>"Nicolas Kalkhof" <nkalkhof@web.de> wrote:
>
>> 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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>
>
>--
>Jesse Barnes, Intel Open Source Technology Center
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