Nouveau - Aug 2016 - [Bug 97367] New: k520 card produce high volume of IRQ

https://bugs.freedesktop.org/show_bug.cgi?id=97367

            Bug ID: 97367
           Summary: k520 card produce high volume of IRQ
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: mmaret at genymobile.com
        QA Contact: xorg-team at lists.x.org

Created attachment 125818
  --> https://bugs.freedesktop.org/attachment.cgi?id=125818&action=edit
dmesg

Amazon propose computer with k520(GK104) GPU for virtualisation (Xen).
You can use Ubuntu LTS on it for example.
When inserting the nouveau driver, /proc/interrupts report that nvkm is doing
~100000 interrupts/sec.

This have been tested on kernel 4.4.0 and 4.4.13.

On amazon, you do not control the real hardware where your system will be run.
It appear that sometimes, this issue do not happen. May be this could be due to
vbios version ?

Forcing nouveau in headless mode (modeset=2) produce a normal amount of IRQ.

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--- Comment #1 from Mathieu Maret <mmaret at genymobile.com> ---
Created attachment 125819
  --> https://bugs.freedesktop.org/attachment.cgi?id=125819&action=edit
vbios ROM

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--- Comment #2 from Mathieu Maret <mmaret at genymobile.com> ---
Created attachment 125821
  --> https://bugs.freedesktop.org/attachment.cgi?id=125821&action=edit
dmesg with debug (nouveau.debug=debug drm.debug=0xe)

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--- Comment #3 from Mathieu Maret <mmaret at genymobile.com> ---
With another try having modeset=2 does not produce a normal amount of IRQ.
Sorry for the error, it should be due to the randomness of the issue :/

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--- Comment #4 from Mathieu Maret <mmaret at genymobile.com> ---
Created attachment 125864
  --> https://bugs.freedesktop.org/attachment.cgi?id=125864&action=edit
perf report from perf record -ag

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--- Comment #5 from Mathieu Maret <mmaret at genymobile.com> ---
Created attachment 125865
  --> https://bugs.freedesktop.org/attachment.cgi?id=125865&action=edit
perf report from perf record -g -C 7

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--- Comment #6 from Mathieu Maret <mmaret at genymobile.com> ---
Created attachment 125866
  --> https://bugs.freedesktop.org/attachment.cgi?id=125866&action=edit
result from 'cat /proc/interrupts > irq ; sleep 1; cat /proc/interrupts
>>irq'

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--- Comment #7 from Mathieu Maret <mmaret at genymobile.com> ---
The irq file show that the IRQ on nvkm happens 140954 times in 1 sec.
The perf reports does not show things related to nvkm, but I may not have use
the right options for perf

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--- Comment #8 from Mathieu Maret <mmaret at genymobile.com> ---
Disabling MSI interrupts (with config="NvMSI=0") reduce the number of
IRQ to
about 1k/s

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--- Comment #9 from Mathieu Maret <mmaret at genymobile.com> ---
Created attachment 129412
  --> https://bugs.freedesktop.org/attachment.cgi?id=129412&action=edit
Tracing using ftrace during 1sec

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--- Comment #10 from Mathieu Maret <mmaret at genymobile.com> ---
This issue can be reproduce on 4.10-rc10

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Martin Peres <martin.peres at free.fr> changed:

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

--- Comment #11 from Martin Peres <martin.peres at free.fr> ---
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