Re: Linux in a binary world... a doomsday scenario

[Helge Hafting <helge.hafting@aitel.hist.no>]

Nix wrote:
[...]

> FWIW when glxgears is running, X consumes about 2% more CPU time
> than normal: it's almost impossible to detect.
>  
Sure - the load is low - and so is performance.  As if the machine
isn't really trying - perhaps the driver is waiting when there is
no need to wait.

> It sounds to me almost like direct rendering is disabled, which will of
> course have catastropic effects on performance. What does glxinfo say?
>  
No.  While it is bad, it is not as bad as sw rendering. Tuxracer
with sw rendering is unbearable - 2 seconds per frame or so!

> >         Most people don't seem to have performance problems,
> > with their radeons, so perhaps my card is a bit different and
> > don't fit the driver.
> >    
>
> The X startup log can also be useful here. I've noticed that if you
> get the AGPMode wrong in either direction, the results can be
> catastrophic: if it's too low the card is terribly slow and if it's
> too high you soon get the X server hanging as it waits forever for
> the card to respond to something it hasn't had time to receive (or
> something like that, anyway).
>  
Well, there is no AGPmode for a PCI card, is there?

Helge Hafting
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/