David Olofson wrote:
>
> On Tuesday 20 March 2001 10:37, Erwin Rol wrote:
> > The low latency ppl also warm against using the linux framebuffer
> > drivers, although they
> > don't have hardrealtime so this warning might not be of importance for
> > RTAI.
>
> Right; Linux/lowlatency relies on the Linux scheduler, and the framebuffer
> problem (possibly about to be fixed) is that the fb drivers stay in kernel
> space for extended amounts of time. A fully preemptive RT kernel that
> bypasses Linux (such as RTL or RTAI) wouldn't be affected by that.
It might be interesting to see if the FB driver also causes PCI stalls ?
and with
that causes problems with RTAI.
>
> The problem with some X servers and some cards are related to incorrect use
> of the PCI/AGP bus, allowing it to block the CPU for several ms occasionally.
> (A CPU blocked on the bus can't handle interrupts...)
There has been a thread about this a while back , at that time i hacked
around in the XFree 4.0.x
sources (with help of some of the Xfree ppl) but could not really fix
the problem apprt from
totaly turning off acceleration. When more ppl are starting to run into
this i might have to
pick up where i left off at that time and create some test programms and
start collecting data
from ppl and with that compile white and black lists , of cards and
board combo's.
>
> Now, I've never seen a complete list of servers/cards with this problem... Is
> there one at all?
Well my s3virge DX in combination with a ASUS A7V (TB800) can be put on
it, it is useless
for hardrealtime :-)
- Erwin
>
> //David
>
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