[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82055

Kai  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution|--- |FIXED

--- Comment #15 from Kai  ---
Ok, since my bisecting adventures took too long I just built
xorg/xserver:master, commit c52a2b1eba. That version doesn't exhibit this
problem. I consider this fixed.

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82055

--- Comment #14 from Michel D?nzer  ---
(In reply to comment #13)
> According to the sysprof output, libpixman is the place where moste CPU time
> goes.

That just means the problem is a software rendering fallback path, but it
doesn't show which one. You'd need to make sure at least the X server binaries
are compiled with -fno-omit-frame-pointer and have debugging symbols.


(In reply to comment #7)
> Do you know which commit resolves this?

Not sure, but my guess would be
http://cgit.freedesktop.org/xorg/xserver/commit/?id=45ebc4e3fac7f1a85167d05e2833949b89f02d64
or one of the commits surrounding it.

> If not, do you need a bisect?

That would be interesting.

> If yes, will that commit be backported to the 1.16 branch?

I can't predict the future, you'll have to nominate it and see. :)

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=82055

--- Comment #13 from Kai  ---
Created attachment 104001
  --> https://bugs.freedesktop.org/attachment.cgi?id=104001=edit
sysporf points to libpixman

According to the sysprof output, libpixman is the place where moste CPU time
goes. If you want the sysprof output, let me know and I e-mail it to you. Not
sure I want to put it on the internet, as didn't have time to check what data
might be disclosed.

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82055

--- Comment #12 from Kai  ---
Created attachment 104000
  --> https://bugs.freedesktop.org/attachment.cgi?id=104000=edit
X uses a lot of CPU cycles, as shown by top

As you can see from this top screenshot, X is using a lot of CPU cycles.

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=82055

--- Comment #11 from Kai  ---
I've uploaded the requested files (attachment 103995, attachment 103996,
attachment 103997) and now checked the installed Flash version, it is
11.2.202.394.

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=82055

--- Comment #10 from Kai  ---
Created attachment 103997
  --> https://bugs.freedesktop.org/attachment.cgi?id=103997=edit
glxinfo output

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=82055

--- Comment #9 from Kai  ---
Created attachment 103996
  --> https://bugs.freedesktop.org/attachment.cgi?id=103996=edit
dmesg output

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

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--- Comment #8 from Kai  ---
Created attachment 103995
  --> https://bugs.freedesktop.org/attachment.cgi?id=103995=edit
Xorg.0.log

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=82055

--- Comment #7 from Kai  ---
(In reply to comment #6)
> (In reply to comment #4)
> > Yes, Twitch, like YouTube, requires Flash.
> 
> Actually, YouTube doesn't require Flash, at least not for many videos.

If I go by top, then the CPU usage of the plugin container spikes for all
videos on YouTube (usually to about 30-50% on one core with Flash HW
acceleration enabled). But as  tells me I'm
using the default player, that doesn't seem too surprising.

> > > Does doing anything in particular trigger it in MediathekView?
> > 
> > Sort of: just starting is enough. You get the grey window background at
> > below average speed and then it takes seconds until the UI elements are
> > drawn (list of shows, filter boxes, buttons). Afterwards you can trigger a
> > new CPU spike by trying to click anything or even better on each
> > keypress/character input into the title filter field on the left.
> 
> I can reproduce this with glamor from xserver 1.16.0, but not from current
> xserver Git master. So at least that part is already fixed.

Oh, nice. Do you know which commit resolves this? If not, do you need a bisect?
If yes, will that commit be backported to the 1.16 branch?

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

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--- Comment #6 from Michel D?nzer  ---
(In reply to comment #4)
> Yes, Twitch, like YouTube, requires Flash.

Actually, YouTube doesn't require Flash, at least not for many videos.


> > Does doing anything in particular trigger it in MediathekView?
> 
> Sort of: just starting is enough. You get the grey window background at
> below average speed and then it takes seconds until the UI elements are
> drawn (list of shows, filter boxes, buttons). Afterwards you can trigger a
> new CPU spike by trying to click anything or even better on each
> keypress/character input into the title filter field on the left.

I can reproduce this with glamor from xserver 1.16.0, but not from current
xserver Git master. So at least that part is already fixed.

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=82055

--- Comment #5 from Kai  ---
(In reply to comment #4)
> (In reply to comment #3)
> > AFAICT Twitch requires Flash; what Flash plugin are you using in what
> > browser?
> 
> Yes, Twitch, like YouTube, requires Flash. I use the plugin installed by
> flashplugin-nonfree and its update-flashplugin-nonfree script. It's the 64
> bit version. I check the version number later again. But it was recently
> updated.

Sorry, forgot to name the browser: Iceweasel 31.0-3 (aka Firefox 31.0).

Just to note this again: other video pages like YouTube don't show the problem
Twitch has. And it's also only giving these spikes, when you try to watch a
recorded broadcast, not for live streams.

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

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--- Comment #4 from Kai  ---
(In reply to comment #3)
> CPU profiles from sysprof or perf or oprofile might be interesting.

Ok, I'll try to do that; I might not be able to do that today, though.

> AFAICT Twitch requires Flash; what Flash plugin are you using in what
> browser?

Yes, Twitch, like YouTube, requires Flash. I use the plugin installed by
flashplugin-nonfree and its update-flashplugin-nonfree script. It's the 64 bit
version. I check the version number later again. But it was recently updated.

> Does doing anything in particular trigger it in MediathekView?

Sort of: just starting is enough. You get the grey window background at below
average speed and then it takes seconds until the UI elements are drawn (list
of shows, filter boxes, buttons). Afterwards you can trigger a new CPU spike by
trying to click anything or even better on each keypress/character input into
the title filter field on the left.

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

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--- Comment #3 from Michel D?nzer  ---
CPU profiles from sysprof or perf or oprofile might be interesting.

AFAICT Twitch requires Flash; what Flash plugin are you using in what browser?

Does doing anything in particular trigger it in MediathekView?

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

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--- Comment #2 from Kai  ---
(In reply to comment #1)
> Please attach the Xorg.0.log and the output of dmesg and glxinfo.

Will post those later, when I'm back at that system.

> Is this with DPM successfully changing clocks?

As written in bug 74250, comment #8 reclocking doesn't seem to work for me.
Whatever I've been doing, the output of cat
/sys/kernel/debug/dri/0/radeon_pm_info /sys/kernel/debug/dri/64/radeon_pm_info
stays:
> power level avgsclk: 3 mclk: 15000
> power level avgsclk: 3 mclk: 15000

(observed through a SSH connection, in order to keep the 3D applications
running fullscreen). I can check the clocks with e.g. MediathekView too, but it
would be very weird if the GPU would reclock for "simple" applications and not
for the 3D applications, wouldn't it?

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[Bug 82055] [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=82055

--- Comment #1 from Michel D?nzer  ---
Please attach the Xorg.0.log and the output of dmesg and glxinfo.

Is this with DPM successfully changing clocks?

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