very bad performance

Mihai Donțu mihai.dontu at
Wed Aug 8 06:42:36 PDT 2012

On Tue, 07 Aug 2012 17:28:40 +0100 Chris Wilson wrote:
> On Tue, 7 Aug 2012 19:00:14 +0300, Mihai Donțu wrote:
> > Hi,
> > 
> > I'm having an issue where everything on my desktop moves dog slow
> > after some days of operation. :-)
> > 
> > My scenario: I open a lot of applications (konsole, kate, krdc,
> > claws-mail etc.) which I use the entire time while I'm at work.
> > When I leave I just suspend my system, go home, resume and continue
> > for another two or three hours after which I suspend again until
> > the next day at work. I do this for two or three days. At some
> > point, a few hours after I resumed, everything starts
> > moving/reacting very slow to the point where it becomes impossible
> > to work (it takes 2-3 seconds to move from one email to another in
> > claws-mail, when it used to be an instant operation). All types of
> > applications (qt-based, gtk-based etc.) behave this way. The only
> > solution I've found is to close everything, log out and log back in.
> > 
> > I used to encounter this type of problem when using the nvidia blob,
> > without doing any suspend/resume.
> > 
> > Has anyone else encountered this issue? Does anyone have any
> > suggestions? None of the logs
> > (dmesg, .xsession-error, /var/log/messages, /var/log/Xorg.log)
> > contain anything about this.
> There have bugs where the cacheability flags of the pages in memory
> have been lost over suspend and resume, and where the GPU became
> stuck in a low power mode. So such degradation of performance over
> time is not unheard of. One of the key questions is if we have no
> errors reported how do the performance characteristics of the system
> vary over time? Running x11perf along with the benchmarks from
> intel-gpu-tools would be a good way to get some results that should
> help give some insight as to what changes. Along with comparing perf
> profiles over time.

Are there any specific x11perf tests I should be looking at? Or should
I just script the run of all supported tests? There are many. :-)

I'm looking into intel-gpu-tools too. Btw: how can I find out if the
GPU is stuck in a low power mode?

Mihai Donțu

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