[Bug 97367] New: k520 card produce high volume of IRQ

[Bug 97367] New: k520 card produce high volume of IRQ

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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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-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: mmaret-LWXiaffTwBPZJqsBc5GL+g@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.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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[Bug 97367] k520 card produce high volume of IRQ

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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

--- Comment #1 from Mathieu Maret <mmaret-LWXiaffTwBPZJqsBc5GL+g@public.gmane.org> ---
Created attachment 125819
  --> https://bugs.freedesktop.org/attachment.cgi?id=125819&action=edit
vbios ROM

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[Bug 97367] k520 card produce high volume of IRQ

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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

--- Comment #2 from Mathieu Maret <mmaret-LWXiaffTwBPZJqsBc5GL+g@public.gmane.org> ---
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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[Bug 97367] k520 card produce high volume of IRQ

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

--- Comment #3 from Mathieu Maret <mmaret-LWXiaffTwBPZJqsBc5GL+g@public.gmane.org> ---
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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[Bug 97367] k520 card produce high volume of IRQ

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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

--- Comment #4 from Mathieu Maret <mmaret-LWXiaffTwBPZJqsBc5GL+g@public.gmane.org> ---
Created attachment 125864
  --> https://bugs.freedesktop.org/attachment.cgi?id=125864&action=edit
perf report from perf record -ag

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[Bug 97367] k520 card produce high volume of IRQ

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

--- Comment #5 from Mathieu Maret <mmaret-LWXiaffTwBPZJqsBc5GL+g@public.gmane.org> ---
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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[Bug 97367] k520 card produce high volume of IRQ

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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

--- Comment #6 from Mathieu Maret <mmaret-LWXiaffTwBPZJqsBc5GL+g@public.gmane.org> ---
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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[Bug 97367] k520 card produce high volume of IRQ

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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

--- Comment #7 from Mathieu Maret <mmaret-LWXiaffTwBPZJqsBc5GL+g@public.gmane.org> ---
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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[Bug 97367] k520 card produce high volume of IRQ

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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

--- Comment #8 from Mathieu Maret <mmaret-LWXiaffTwBPZJqsBc5GL+g@public.gmane.org> ---
Disabling MSI interrupts (with config="NvMSI=0") reduce the number of IRQ to
about 1k/s

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[Bug 97367] k520 card produce high volume of IRQ

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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

--- Comment #9 from Mathieu Maret <mmaret-LWXiaffTwBPZJqsBc5GL+g@public.gmane.org> ---
Created attachment 129412
  --> https://bugs.freedesktop.org/attachment.cgi?id=129412&action=edit
Tracing using ftrace during 1sec

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[Bug 97367] k520 card produce high volume of IRQ

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

--- Comment #10 from Mathieu Maret <mmaret-LWXiaffTwBPZJqsBc5GL+g@public.gmane.org> ---
This issue can be reproduce on 4.10-rc10

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[Bug 97367] k520 card produce high volume of IRQ

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

Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> changed:

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

--- Comment #11 from Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> ---
-- 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
to our GitLab instance:
https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/280.

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