[ltp] Xorg Performance, on Intel Graphics

[Andrew Mason]

Driconf for me reports 'Could not detect any configrable
direct-rendering capable devices. DRIconf will be started in expert
mode.'

This is with an intel X4500. I have enabled UXA to make it usable as
EXA was very slow. I do not have compositing enabled. I have a DRI
stanza in my xorg.conf.

I'm obviously doing something wrong, any ideas where to look ?

On Sat, Apr 4, 2009 at 8:37 AM, Marius Gedminas <marius@gedmin.as> wrote:
> On Fri, Apr 03, 2009 at 02:41:43PM +0200, Thomas Kahle wrote:
>> Matthias Runge wrote:
>> > Thomas Kahle wrote:
>> >> I use the thinkpad X61s with Intel Graphics Mobile GM965/GL960 runnin=
g
>> >> Gentoo.
>> >>
>> >> Since an update on Monday I cannot get my X to work the smooth way it
>> >> was working before.
>> >>
>> >> 1) The 2D performance feels very slack, Redrawing Windows just takes
>> >> longer than it took before and reaction times in general are worse.
>> >> 2) glxgears performance is down to 50FPS (200FPS before, but I rememb=
er
>> >> 1000FPS a year ago), but reading about kernel 2.6.29 probably it shou=
ld
>> >> be this way.
>> >
>> > pleasse check via driconf, if "Synchronization with vertical refresh" =
is
>> > set to "always synchronize..." It looks like this option is default in
>> > Mesa 7.4 (and changed since 7.3)
>>
>> Ok, this was really helpful. Is this set permanently now, or do I have
>> to repeat it after restarting X ?
>>
>> Anyway, I don't get what this has to do with 2D performance... For the
>> moment 2D performance is back to normal and glxgears (Which is not a
>> benchmark, yes :) shows 800 FPS.
>
> The LCD panel is updated with a new picture 50 times per second.
> Drawing 750 more frames that will never be show every second seems like
> a pointless waste of battery life.
>
> Also, you get tearing if you disable vsync.
>
> Regarding the slowdowns and memory leaks -- I've seen people complaining
> on the xorg@ list, and I've seen patches floating with fixes. =A0I still
> use Ubuntu 8.10, so I haven't been keeping track of the driver versions
> with and without the fixes. =A0You may have better luck asking in
> xorg@freedesktop.org.
>
> Marius Gedminas
> --
> There are 10 kinds of people in the world: Those who understand binary
> mathematics and those who don't.
>
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