[Bug 15344] New: Gradual Performance Decline With Nouveau Driver

[Bug 15344] New: Gradual Performance Decline With Nouveau Driver

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=15344

           Summary: Gradual Performance Decline With Nouveau Driver
           Product: xorg
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
        ReportedBy: dgoodwin-eRDYlh02QjtL43Ps8y5oD9BPR1lH4CV8@public.gmane.org
         QAContact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org


Created an attachment (id=15661)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=15661)
My current xorg.conf.

Noticing a steady and significant decline in X performance when rendering large
changes to what's on screen. (eg. switching workspaces or Firefox tabs)

When X is first started everything behaves nicely with performance similar to
what I'm used to with the nvidia driver. However within an hour or two
significant lag starts to develop when navigating and CPU usage seems to be
spiking quite hard while the rendering is taking place. ('top' indicates the
process is X) Window borders are visible somewhat quickly but the contents of
those windows seems to be what takes the most time to appear.

Replicated using Openbox window manager and about 6 workspaces, although only 3
in use with approximately 4 Gnome terminals open and one Firefox instance. OS
is Fedora 9 beta.

Will attach xorg.conf and X log below.

Please let me know if there is any additional info I can provide or particular
things to test to help isolate the issue I'm seeing.


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[Bug 15344] Gradual Performance Decline With Nouveau Driver

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=15344





--- Comment #1 from Devan Goodwin <dgoodwin-eRDYlh02QjtL43Ps8y5oD9BPR1lH4CV8@public.gmane.org>  2008-04-03 11:59:57 PST ---
Created an attachment (id=15664)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=15664)
Xorg.0.log


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[Bug 15344] Gradual Performance Decline With Nouveau Driver

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=15344





--- Comment #2 from Devan Goodwin <dgoodwin@dangerouslyinc.com>  2008-04-03 13:33:44 PST ---
Some further testing:

• Workspace switching noticeably slower after just 20 minutes.
• Switched to Metacity after starting to notice the lag, appears to make no
difference.
• Actual process listed in top when CPU goes up during a laggy workspace
switch is Xorg.
• System memory usage fine, below 50%.
• No swap in use.
• Restarting X makes things go back to normal.


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[Bug 15344] Gradual Performance Decline With Nouveau Driver

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=15344





--- Comment #3 from Maarten Maathuis <madman2003-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2008-04-03 13:55:32 PST ---
My guess is ExaMarkUsed() is to blame, a run of oprofile would reveal this.

This is known problem, not specific to nouveau, fixed in xserver git (as of a
few days ago).

Otherwise i wouldn't know.


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[Bug 15344] Gradual Performance Decline With Nouveau Driver

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http://bugs.freedesktop.org/show_bug.cgi?id=15344





--- Comment #4 from Michel Dänzer <michel@tungstengraphics.com>  2008-04-03 22:41:27 PST ---
Another possibility is EXA offscreen memory fragmentation. Does VT switching to
console and back improve performance temporarily?


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[Bug 15344] Gradual Performance Decline With Nouveau Driver

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=15344





--- Comment #5 from Devan Goodwin <dgoodwin-eRDYlh02QjtL43Ps8y5oD9BPR1lH4CV8@public.gmane.org>  2008-04-04 09:46:43 PST ---
Tried VT switching but I can't notice any difference when switching back.

Have been running without restart all morning and definitely seeing a
progressively worse delay switching desktops, up to around 3s to switch
currently.

Was becoming worried that some of what I'm seeing may just be the difference in
performance from the driver I'm used to. Certain operations are brutally
chuggy, scrolling in FF3+Gmail, pressing Esc on an empty command buffer in
vim-gnome, or rendering any app running on the network via ssh forwarding. I
was concerned I was confusing these with a performance bug but I'm definitely
seeing it get worse and worse as the day wears on. Not sure if it will peak
yet.


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[Bug 15344] Gradual Performance Decline With Nouveau Driver

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http://bugs.freedesktop.org/show_bug.cgi?id=15344





--- Comment #6 from Devan Goodwin <dgoodwin-eRDYlh02QjtL43Ps8y5oD9BPR1lH4CV8@public.gmane.org>  2008-04-04 10:11:56 PST ---
Correction, now that the lag is getting really terrible, re-tried VT switching
and this *definitely* made a difference. After switching back the desktop
switching isn't blazing but it's a far cry better, renders within a second
whereas it was taking almost 4-5 before.


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[Bug 15344] Gradual Performance Decline With Nouveau Driver

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http://bugs.freedesktop.org/show_bug.cgi?id=15344





--- Comment #7 from Daniele Primon <ledebass-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2008-04-30 01:37:42 PST ---
Created an attachment (id=16254)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=16254)
kernel and module's  log

I also experienced slowdown in performance. The session has been running for
more than a day with a remote ssh login and glxgears and xscreensaver demo's
run twice with gallium drive. I've tried switching VTs but that results in
screen corruption.


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[Bug 15344] Gradual Performance Decline With Nouveau Driver

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http://bugs.freedesktop.org/show_bug.cgi?id=15344





--- Comment #8 from Daniele Primon <ledebass-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2008-04-30 01:38:59 PST ---
Created an attachment (id=16255)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=16255)
Xorg's log


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[Bug 15344] Gradual Performance Decline With Nouveau Driver

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=15344





--- Comment #9 from Michel Dänzer <michel@tungstengraphics.com>  2008-04-30 02:46:39 PST ---
Created an attachment (id=16256)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=16256)
Test patch

(In reply to comment #7)
> [...] glxgears and xscreensaver demo's run twice with gallium drive.

Do you mean GL performance degrades? That's probably not directly related to
EXA.


Does this patch help for the problem reported originally? It implements a
simple defragmentation algorithm.

Whether it helps or not, please provide the output of

grep Defrag /var/log/Xorg.0.log

after running for a while with the patch applied. I'm still looking for better
heuristics for when to do the defragmentation.

Note that there have been some recent EXA changes only available on the xserver
master branch so far which could help for this as well (or should at least
improve text performance a lot).


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[Bug 15344] Gradual Performance Decline With Nouveau Driver

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=15344





--- Comment #10 from Pekka Paalanen <pq-X3B1VOXEql0@public.gmane.org>  2009-09-23 03:04:35 PST ---
Does the current git Nouveau driver still exhibit degrading performance over
time?


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[Bug 15344] Gradual Performance Decline With Nouveau Driver

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http://bugs.freedesktop.org/show_bug.cgi?id=15344





--- Comment #11 from Devan Goodwin <dgoodwin-eRDYlh02QjtL43Ps8y5oD9BPR1lH4CV8@public.gmane.org>  2009-09-26 08:38:29 PST ---
Sorry I cannot test Nouveau behavior today, upgraded hardware no longer Nvidia.


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[Bug 15344] Gradual Performance Decline With Nouveau Driver

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http://bugs.freedesktop.org/show_bug.cgi?id=15344


Pekka Paalanen <pq-X3B1VOXEql0@public.gmane.org> changed:

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




--- Comment #12 from Pekka Paalanen <pq-X3B1VOXEql0@public.gmane.org>  2009-09-26 08:43:30 PST ---
Okay, thanks. Closing as fixed.


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