Ok Here we go again,
I am running a G400MAX now and have simmulair problems, but not as bad.
Normal latency is around 10usecs, but when a lot of output is writen to
a
X-terminal it jumps to 500usec. When enabling PCIretries (so writing to
the FIFO
without checking if it is full) it always shows a latency of 500usec
when for example
running 'x11perf -all', so it looks like in the MGA driver there is a
spot where there
is forgotten to check if the FIFO is full (i am looking into the source
at the moment).
The thing that worries me a bit is the fact that now 3 XFree 4.0.1
drivers cause problems
for RT-Linux , the nVidia, the mga and the s3virge one.
I would really like to see someone else try Xfree 4.0.1 with RT-linux (i
know it is a pain when you have
a distribution with XFree 3.3.x :-/ )
OK will keep you posted on what else i find out,
Erwin
Michel Dänzer wrote:
>
> Erwin Rol wrote:
>
> > > - Try "pci_burst" and "pci_retry" in the Device section. (Both on.)
> > done that.
>
> What if you disable PCI retry? I'd have imagined that the PCI bus might stall
> when the CPU tries to access a register while the accelerator is doing a
> time-consuming task.
>
> Please forgive me if this is completely off...
>
> Michel
>
> --
> Earthling Michel Dänzer (MrCooper) \ CS student and free software enthusiast
> Debian GNU/Linux (powerpc,i386) user \ member of XFree86 and The DRI Project
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