Bug#467086: xserver-xorg-core: Bad performances with certainXorg.conf options
On Sat, 23 Feb 2008 00:19:57 +0100, Brice Goglin <Brice.Goglin@ens-lyon.org> wrote:
> severity 467086 normal
> thank you
>
>
>> Basically for weeks my computer has been kind of unusable while having
> Firefox or Konqueror open and I just realized why yesterday:
>> I changed 2 options in my Xorg.conf and the perfomances have been back
> to normal.
>>
>> The options changed are:
>> - Option "AccelMethod" from "EXA" to "XAA"
>> - Nothing to Option "XAANoOffScreenPixmaps" "True"
>>
>> I am using a Radeon M9000 which is kind of dead so I underclock it,
> therefore no 3D acceleration is possible anymore and probably not much of
> 2D acceleration either....
>>
>
> So you want EXA (which is an 2D acceleration architecture) to be fast
> without hardware acceleration? I doubt that'll work...
>
> If XaaNoOffscreenPixmaps help, does it mean you are running Compiz or
> another compositing manager such as kwin with fancy effects?
>
> Brice
Well I do have hardware acceleration somewhere it's just way slower than it should be as the clocks' frequency are like 1/4th of what they should be.
I am not running any composite WM for this test (for Firefox it was done on Fluxbox to be sure nothing else would interfere).
One thing I must add, is that when the computer was kind of unusable (not locked but really slow, like 2-3 seconds to switch a tab in Konqueror or Firefox, and maybe 5 seconds to switch to another application like Konsole/xterm in a quite empty DE) the CPU usage seen in htop was still very low so not that much related to a high cpu usage it seems.
I do not fully remember my old options, I know I tried many when KDE4 did not work, so maybe I thought this was a new bug when it was actually me using new settings... If so please forgive that stupid bug report.
Thank you,
John
(I hope this is the right CC, this is my first time reportings bugs here)
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