Nouveau - Dec 2015 - [RFC PATCH v2 0/7] stabilize kepler reclocking

Am 25.12.2015 um 18:43 schrieb Pierre Moreau:
> Hello,
>
> Maybe my e-mail client is messing with me, but I couldn't find any
dmesg output
> attached to your e-mail. Could you please try to attach it again?
>
> By the way, since you have a Kepler, you should try booting with
> "nouveau.War00C800_0=1". That workaround is enabled by default in
4.4-rc5
> (IIRC), but that might not be the case on Karol's branch.
>
> Best regards,
> Pierre
>
I did not find that parameter under /sys/module/nouveau/parameters. 
Google led me to try nouveau.config=War00C800_0=1 instead.

Anyway, I added both to the kernel cmdline. Unfortunately it made no 
difference. Dota 2 still freezes up the system pretty much immediately 
(when 0f pstate is in use).

I verified the config is active through cat 
/sys/module/nouveau/parameters/config (returns a single lien 
"War00C800_0=1" as expected).

Best regards

> Thomas Martitz <kugel at rockbox.org> hat am 30. Dezember 2015 um
23:53
> geschrieben:
> 
> Am 25.12.2015 um 18:43 schrieb Pierre Moreau:
> > Hello,
> >
> > Maybe my e-mail client is messing with me, but I couldn't find any
dmesg
> > output
> > attached to your e-mail. Could you please try to attach it again?
> >
> > By the way, since you have a Kepler, you should try booting with
> > "nouveau.War00C800_0=1". That workaround is enabled by
default in 4.4-rc5
> > (IIRC), but that might not be the case on Karol's branch.
> >
> > Best regards,
> > Pierre
> >
> 
> I did not find that parameter under /sys/module/nouveau/parameters. 
> Google led me to try nouveau.config=War00C800_0=1 instead.
> 
> Anyway, I added both to the kernel cmdline. Unfortunately it made no 
> difference. Dota 2 still freezes up the system pretty much immediately 
> (when 0f pstate is in use).
well so that means that it doesn't freeze when not using 0f?

I suspect that nouveau currently just sets the voltage too low, but this is
another issue
and this issue will be tackled next year.

You could replace info.min with info.max in
drm/nouveau/nvkm/subdev/volt/base.c:nvkm_volt_map
but this will result in more heat generated by your gpu and nouveau currently
does not verifies if the
ovearheating protection is setup sanely (though it should be setup already by
the gpu itself)

Just keep an eye open on sensors while testing this.

I hope that helps.
> 
> I verified the config is active through cat 
> /sys/module/nouveau/parameters/config (returns a single lien 
> "War00C800_0=1" as expected).
> 
> Best regards
> _______________________________________________
> Nouveau mailing list
> Nouveau at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/nouveau

Am 31. Dezember 2015 03:54:43 MEZ, schrieb Karol Herbst <nouveau at
karolherbst.de>:
>> Thomas Martitz <kugel at rockbox.org> hat am 30. Dezember 2015 um
23:53
>> geschrieben:
>> 
>> Am 25.12.2015 um 18:43 schrieb Pierre Moreau:
>> > Hello,
>> >
>> > Maybe my e-mail client is messing with me, but I couldn't find
any
>dmesg
>> > output
>> > attached to your e-mail. Could you please try to attach it again?
>> >
>> > By the way, since you have a Kepler, you should try booting with
>> > "nouveau.War00C800_0=1". That workaround is enabled by
default in
>4.4-rc5
>> > (IIRC), but that might not be the case on Karol's branch.
>> >
>> > Best regards,
>> > Pierre
>> >
>> 
>> I did not find that parameter under /sys/module/nouveau/parameters. 
>> Google led me to try nouveau.config=War00C800_0=1 instead.
>> 
>> Anyway, I added both to the kernel cmdline. Unfortunately it made no 
>> difference. Dota 2 still freezes up the system pretty much
>immediately 
>> (when 0f pstate is in use).
>
>well so that means that it doesn't freeze when not using 0f?
>
That's right.

>I suspect that nouveau currently just sets the voltage too low, but
>this is
>another issue
>and this issue will be tackled next year.
>
>You could replace info.min with info.max in
>drm/nouveau/nvkm/subdev/volt/base.c:nvkm_volt_map
>but this will result in more heat generated by your gpu and nouveau
>currently
>does not verifies if the
>ovearheating protection is setup sanely (though it should be setup
>already by
>the gpu itself)
>
What's your recommendation to determine suitable values? I could try the
binary driver under Linux or win10. Under win10 I know some tools (e.g. msi
afterburner). Note that I know next to nothing about the Kepler architecture
itself, just the basic voltage-frequency-temperature interactions.
>Just keep an eye open on sensors while testing this.
>
What's your recommendation here to continously read temperature data under
nouveau?

Best regards