Profiling X, KDE, KWin and friends...

[Ilyes Gouta]

Alright, thank you guys for the information. I'm gonna try sysprof out, it
looks like it's THE tool I'm looking for!

Regards,
Ilyes Gouta.

2009/4/15 Adam Jackson <ajax at redhat.com>

> On Wed, 2009-04-15 at 12:12 -0700, Adam Williamson wrote:
> > On Wed, 2009-04-15 at 12:12 +0100, Ilyes Gouta wrote:
> > > Hi,
> > >
> > > I'm running Fedora 10 on my old Thinkpad R50e, which has a Pentium M
> > > and an intel 855GM graphics card and I'm not happy with the
> > > performance of KDE, Kwin, Xserver and al. where sometimes, I can
> > > clearly see a given window getting its background cleared and its
> > > content redrawn slowly. I remember I didn't have annoying artifacts
> > > when I was running Windows, three years ago on the same machine. I
> > > don't have composition enabled or any fancy thing in my KDE setup. So
> > > basically, I'm asking if you guys know about any profiling tool that
> > > would enable me to see where the system is spending its time,
> > > especially when rendering the desktop.
> >
> > I'm fairly sure performance regressions are one of the known issues with
> > older Intel chips (pre-i915, basically) on the newer versions of the
> > intel driver, so you may want to check redhat and freedesktop bugzillas
> > first to see if anyone's reported similar problems.
>
> There's at least one known problem with 855 and 865, which is that we
> don't quite have the cache flushing logic right yet (partly chipset
> bugs, partly inadequate CPUs on those boards), which means you end up
> invalidating all write-back mappings on every buffer you ask the GPU to
> execute (which means cache flush, which means a lot of memory write
> traffic).  Not the fastest thing ever.
>
> If this is what you're hitting, sysprof would show you spending an
> inordinate amount of time in i915_gem_execbuffer() in the kernel.
>
> sysprof is an _awesome_ tool, by the way.
>
> - ajax
>
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>
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