[Nouveau] [Bug 95044] [NVA0] [Reclocking] GPU doesn't relax memory clocks

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=95044

Martin Peres  changed:

   What|Removed |Added

 Resolution|--- |MOVED
 Status|ASSIGNED|RESOLVED

--- Comment #10 from Martin Peres  ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
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You can subscribe and participate further through the new bug through this link
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[Nouveau] [Bug 95044] [NVA0] [Reclocking] GPU doesn't relax memory clocks

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https://bugs.freedesktop.org/show_bug.cgi?id=95044

Roy  changed:

   What|Removed |Added

 CC||nouveau@lists.freedesktop.o
   ||rg

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[Nouveau] [Bug 95044] [NVA0] [Reclocking] GPU doesn't relax memory clocks

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=95044

Roy  changed:

   What|Removed |Added

   Assignee|nouveau@lists.freedesktop.o |skeg...@gmail.com
   |rg  |

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[Nouveau] [Bug 95044] [NVA0] [Reclocking] GPU doesn't relax memory clocks

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https://bugs.freedesktop.org/show_bug.cgi?id=95044

--- Comment #8 from debianlinuxe...@gmail.com ---
I've just applied the patch and check.


IT WORKS!!


It switches well towards all transitions, from down to top (step by step), top
to down (step by step) and from extreme to extreme (03 -> 0f and 0f -> 03).

Good work!

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[Nouveau] [Bug 95044] [NVA0] [Reclocking] GPU doesn't relax memory clocks

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=95044

--- Comment #7 from Roy  ---
Created attachment 123554
  --> https://bugs.freedesktop.org/attachment.cgi?id=123554=edit
Remove high-speed mode for GDDR3

Risking to make a fool out of myself because I haven't even compile-tested
this; please patch your kernel with the attached and see if it resolves your
problem.

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[Nouveau] [Bug 95044] [NVA0] [Reclocking] GPU doesn't relax memory clocks

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https://bugs.freedesktop.org/show_bug.cgi?id=95044

--- Comment #6 from debianlinuxe...@gmail.com ---
Created attachment 123159
  --> https://bugs.freedesktop.org/attachment.cgi?id=123159=edit
MMIO trace log file

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[Nouveau] [Bug 95044] [NVA0] [Reclocking] GPU doesn't relax memory clocks

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https://bugs.freedesktop.org/show_bug.cgi?id=95044

--- Comment #5 from debianlinuxe...@gmail.com ---
As karolherbst pointed on the #nouveau irc channel, I patched my distro kernel
sources with this patch : 

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/arch/x86/mm/kmmio.c?id=cfa52c0cfa4d727aa3e457bf29aeff296c528a08

Build with the same options as current kernel.

It did the trick.

I finally was able to do the mmiotrace test.

The test consisted in running the bare X server with only the nvidia-settings
application.

Forced Maximum Performance level.

At reach then forced adaptive.

At reach then exited both application and X.

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[Nouveau] [Bug 95044] [NVA0] [Reclocking] GPU doesn't relax memory clocks

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https://bugs.freedesktop.org/show_bug.cgi?id=95044

--- Comment #4 from debianlinuxe...@gmail.com ---
Hello.

This is what I nvapeek'ed :

001002c0: 0652

001002c4: 001002c8

001002e0: 0020001b



I tried to do the mmiotrace procediment as explained here :
https://wiki.ubuntu.com/X/MMIOTracing

The command choosen was "xinit nvidia-settings", with the intention to force
clocks with the "Prefer Maximum Performance" option, then relaxing with
"Adaptive Mode".

But all what I got was 40 minutes of black screen.
The system didn't shutdown neither with magic sysrq.

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[Nouveau] [Bug 95044] [NVA0] [Reclocking] GPU doesn't relax memory clocks

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https://bugs.freedesktop.org/show_bug.cgi?id=95044

--- Comment #3 from Roy  ---
(In reply to debianlinuxero1 from comment #2)
> Created attachment 123111 [details]
> VBIOS
> 
> The vbios.rom file

Thanks, that's helpful. I'm afraid I also need some info from the official
driver though. In particular a peek from the 0x1002c0, 0x1002c4 and 0x1002e0
registers in the lowest performance level. Could you obtain an mmiotrace of the
official driver going down from the highest to the lowest performance level, xz
it and attach it to this bug please? Alternatively you can nvapeek these
registers in the lowest level (as observed in nvidia-settings).

For reference: I suspect the "high CAS" bit (MR[2], bit 0) in the GDDR3 specs
we used for reference is in fact bogus. Your VBIOS appears to set this bit upon
boot, but apart from the lowest perf lvl, the values written for CAS would
always correspond between the low and high lookup-tables. For the lowest
perflvl, only the low lookup-table contains an entry for the CAS latency. Trace
should help determine whether the official driver unsets the "high CAS" bit or
rather ignores it.

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[Nouveau] [Bug 95044] [NVA0] [Reclocking] GPU doesn't relax memory clocks

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https://bugs.freedesktop.org/show_bug.cgi?id=95044

--- Comment #2 from debianlinuxe...@gmail.com ---
Created attachment 123111
  --> https://bugs.freedesktop.org/attachment.cgi?id=123111=edit
VBIOS

The vbios.rom file

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[Nouveau] [Bug 95044] [NVA0] [Reclocking] GPU doesn't relax memory clocks

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https://bugs.freedesktop.org/show_bug.cgi?id=95044

--- Comment #1 from Ilia Mirkin  ---
Please attach your vbios (/sys/kernel/debug/dri/0/vbios.rom)

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