Nouveau - Apr 2016 - [Bug 95031] New: [NVE4] Random GPU lockups

https://bugs.freedesktop.org/show_bug.cgi?id=95031

            Bug ID: 95031
           Summary: [NVE4] Random GPU lockups
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: lucasout at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 123085
  --> https://bugs.freedesktop.org/attachment.cgi?id=123085&action=edit
nouveau bugs

Having random lockups on a GTX 660 Ti (NVE4), since kernel 4.1 I guess, using
DRI2.
[    0.267666] nouveau 0000:02:00.0: NVIDIA GK104 (0e4030a2)
[    0.378583] nouveau 0000:02:00.0: bios: version 80.04.4b.00.1a
[    0.379302] nouveau 0000:02:00.0: fb: 2048 MiB GDDR5

Now on gentoo ~amd64 using:

sys-kernel/gentoo-sources-4.5.1
x11-base/xorg-server-1.18.3
x11-drivers/xf86-video-nouveau-1.0.12

Also tried Karol Herbst reclocking branch v4
(https://github.com/karolherbst/nouveau/tree/stable_reclocking_kepler_v4),
reclocked to pstate 07 and tried all 3 boost states. All hang sooner or later.

Will continue testing other pstates and boost configurations.

Sometimes the kernel log becomes corrupted, but I managed to get a working log
(attached).

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--- Comment #1 from Lucas Ribeiro <lucasout at gmail.com> ---
Forgot to add: did not try earlier kernels, so this behaviour might exist since
the card was supported. On Windows it works well.

It hangs on normal browsing or opening a video on VLC.

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Lucas Ribeiro <lucasout at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[NVE4] Random GPU lockups   |[NVE4] 660 Ti Random GPU
                   |                            |lockups

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--- Comment #2 from Lucas Ribeiro <lucasout at gmail.com> ---
Different kernel log with some nouveau info.

So far tried pstate 07 with boost 0, 1 and 2.

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--- Comment #3 from Lucas Ribeiro <lucasout at gmail.com> ---
Created attachment 123098
  --> https://bugs.freedesktop.org/attachment.cgi?id=123098&action=edit
another log with different info

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--- Comment #4 from Lucas Ribeiro <lucasout at gmail.com> ---
OK, some interesting findings.

07 pstate on Linux has:
core 324 MHz memory 648 MHz AC DC
GPU core:     +0.99 V
Increasing GPU core voltage to 1.09V has wielded a stable system so far.

On Windows, the idle state has (checked with gpu-z):
core 324 MHz memory 162MHz
GPU core voltage: 0.99V
It has never managed to hang.

So maybe 07 pstate on Linux has a memory clock too high for its voltage. Also,
as it is the lowest pstate, maybe memory clock could be reduced further to
162MHz (as in Windows).

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--- Comment #5 from Lucas Ribeiro <lucasout at gmail.com> ---
Created attachment 123105
  --> https://bugs.freedesktop.org/attachment.cgi?id=123105&action=edit
vbios

Yea, finally managed to hang the system at 07 pstate with 1.09V (+0.1V), with a
corrupted kernel log as well. I dunno what else to do. I'm attaching the
vbios.

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--- Comment #6 from Lucas Ribeiro <lucasout at gmail.com> ---
Created attachment 123106
  --> https://bugs.freedesktop.org/attachment.cgi?id=123106&action=edit
kernel log 3

This time running pstate 0f with +0.1V, total 1.15V. Hangs, corrupts kernel log
and then starts flooding it with a different error.

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--- Comment #7 from Karol Herbst <freedesktop at karolherbst.de> ---
(In reply to Lucas Ribeiro from comment #4)
> 
> So maybe 07 pstate on Linux has a memory clock too high for its voltage.
> Also, as it is the lowest pstate, maybe memory clock could be reduced
> further to 162MHz (as in Windows).
And maybe not. There are other issues which aren't exactly voltage related.
If
such a high votlage won't help, then it is usually something else, we just
have
to figure out what it is.

Also regarding the lower clocks: yeah I know that sometimes nvidia clocks
further down, but there is no real value in doing so if there is no voltage
information for those low clocks and it doesn't make any difference
regarding
power consumption as far as I know.

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--- Comment #8 from Lucas Ribeiro <lucasout at gmail.com> ---
(In reply to Karol Herbst from comment #7)
> (In reply to Lucas Ribeiro from comment #4)
> > 
> > So maybe 07 pstate on Linux has a memory clock too high for its
voltage.
> > Also, as it is the lowest pstate, maybe memory clock could be reduced
> > further to 162MHz (as in Windows).
> 
> And maybe not. There are other issues which aren't exactly voltage
related.
> If such a high votlage won't help, then it is usually something else,
we
> just have to figure out what it is.
> 
> Also regarding the lower clocks: yeah I know that sometimes nvidia clocks
> further down, but there is no real value in doing so if there is no voltage
> information for those low clocks and it doesn't make any difference
> regarding power consumption as far as I know.
Thanks for clearing that up.

I'm out of ideas, should I capture a mmiotrace?

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Lucas Ribeiro <lucasout at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #9 from Lucas Ribeiro <lucasout at gmail.com> ---
Running kernel 4.6 has improved the driver. I don't know what changed, but I
have yet to see lockups on this card. No out of tree patches applied.

Will post again if I experience a freeze.

Thanks!

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