Seems like my S3Virge is not the only card with problems.
question to Richard:
What X-Server ? XFree-3.x or XFRee-4.X or some commercial one
I have seen jitter up to 50msec (without X maxium or 30usec) when
running
XFree-4.0.1 on with my S3Virge clone card. Disableing acceleration got
the jitter
down to the 30usec again. The IRQ disableing in XFree is only done in a
few places
and only for a clockprobe during startup, not when drawing anything. I
replaced
those functions in the source with NOP dummies and that did nothing.
The current discusion (on the RT-linux list) seems to go in the
direction
of a PCI-bus lockingup for a short(several msecs) while.
I am interested in hearing what kind of hardware you use (MB, CPU, RAM,
etc.) and
what X-Version. And just join the RT-Linux (also the home for RTAI
discusions) at
http://www.rtlinux.org/mailing_lists.html
- Erwin
Richard Spijkers wrote:
>
> Hi there,
>
> I am running kernel 2.2.17, RTAI 1.5 and the latest Nvidia driver and I
> have discovered that RTAI isn't really realtime anymore. I tried to find
> the problem and I think the Nvidia driver is disabling the interrupts.
> This stalls the task switching mechanism in RTAI because the timer
> interrupt isn't handled immediatly.
>
> Does anyone have the same problems? If yes, are there more drivers that
> disable the interrupts for a long time?
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