Nouveau - Sep 2010 - [Bug 30375] New: (NV34) X server using 100% cpu with latest nouveau.git and xf86-video-nouveau.git

https://bugs.freedesktop.org/show_bug.cgi?id=30375

           Summary: (NV34) X server using 100% cpu with latest nouveau.git
                    and xf86-video-nouveau.git
           Product: xorg
           Version: git
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: w41ter at gmail.com
         QAContact: xorg-team at lists.x.org


This bug is 100% reproducible on 32-bit linux (not 64-bit) when using the most
recent nightly builds of firefox to view www.npr.org.

The firefox devs changed something on Sept 10 (2010) that tickles this bug in
nouveau.  (The same firefox build works normally with the 'nv' driver.)

To reproduce the problem, download the latest nightly build of ff here:
ftp://ftp.mozilla.org/pub/firefox/nightly/latest-mozilla-central/firefox-4.0b7pre.en-US.linux-i686.tar.bz2

Then visit www.npr.org, that's all.  Xorg will begin using all of the cpu,
making the machine unusably slow.

I see the same when using the linus.git kernel, too, so this is not a brand new
bug.

NV34 [GeForce FX 5200] rev 161 on an older single-core AMD k8 processor.

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--- Comment #1 from Robert Kaiser <kairo at kairo.at> 2010-09-26 13:59:24
PDT ---
I didn't find anything sticking out that could influence graphics that way
when
I did look at Firefox/Mozilla code logs, and I didn't see that happening
myself
even though I'm using state-of-the-art Mozilla code as part of my work
daily,
and I'm using nouveau as well.

Are you sure it's not something like Flash, which accesses graphics
directly?

Of course, with Firefox adding hardware acceleration capabilities recently, our
Mozilla code could trigger nouveau bugs more easily - but from what I see on my
machine, Mozilla doesn't actually enable hardware-accelerated windows (i.e.
compositing) with nouveau right now. Check the bottom of about:support in
Firefox, it probably will tell you that 0/x windows are accelerated.

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--- Comment #2 from walt <w41ter at gmail.com> 2010-09-26 17:00:47 PDT ---
On 09/26/2010 01:59 PM, bugzilla-daemon at freedesktop.org
wrote:
> https://bugs.freedesktop.org/show_bug.cgi?id=30375
>
> --- Comment #1 from Robert Kaiser<kairo at kairo.at>  2010-09-26
13:59:24 PDT ---
> Are you sure it's not something like Flash, which accesses graphics
directly?
Excellent clue, thanks.  The problem was not a plugin, but rather an add-on :-/

When I download and run the nightly builds from mozilla I never install any
plugins for my brief tests -- but just now when I looked at about:plugins I
noticed an add-on that I'd installed for converting video formats in real
time.

The bit that confused me is that the add-on was installed in my ~/.mozilla
directory instead of the firefox/plugins directory, so it was still messing
things up even when running the nightly builds "with no plugins".

The probability of encountering mysterious screw-ups gets closer to 1 with
every passing day :)

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--- Comment #3 from walt <w41ter at gmail.com> 2010-09-30 15:40:27 PDT ---
Oh dear, I spoke much too soon.  I just discovered that the bug disappeared
only because I forgot to change xorg.conf from nv back to nouveau :-(

Now that I really *am* using nouveau, the CPU is still pegged at 99% by Xorg
when viewing the npr.org website with the latest nightly build of firefox.

One new observation that I didn't notice earlier is that minimizing the
firefox
window completely eliminates the cpu overload.

When I restore the firefox window, the cpu overload resumes exactly as before.
I hope this may give you some clue about the cause of the problem.

Again, I've looked closely at my amd64 builds of firefox and nouveau-related
packages and there is no sign of this cpu overload problem.  Just on i686.

I'd be more than happy to build profiling versions of X/nouveau if such
versions exist, but I'll need some hints to get started.

Many thanks.

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--- Comment #4 from walt <w41ter at gmail.com> 2010-10-06 16:05:06 PDT ---
(In reply to comment #3)
> Again, I've looked closely at my amd64 builds of firefox and
nouveau-related
> packages and there is no sign of this cpu overload problem.  Just on i686.
Another big difference between the two machines is that the i686 has NV34
hardware while the amd64 has NV4x.

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

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

--- Comment #5 from Ilia Mirkin <imirkin at alum.mit.edu> ---
It appears that this bug report has laid dormant for quite a while. Sorry we
haven't gotten to it. Since we fix bugs all the time, chances are pretty
good
that your issue has been fixed with the latest software. Please give it a shot.
(Linux kernel 3.10.7, xf86-video-nouveau 1.0.9, mesa 9.1.6, or their git
versions.) If upgrading to the latest isn't an option for you, your
distro's
bugzilla is probably the right destination for your bug report.

In an effort to clean up our bug list, we're pre-emptively closing all bugs
that haven't seen updates since 2011. If the original issue remains, please
make sure to provide fresh info, see http://nouveau.freedesktop.org/wiki/Bugs/
for what we need to see, and re-open this one.

Thanks,

The Nouveau Team

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