Hello Erwin, Michel and other RTAIers
I have been following your RTAI and Xfree86 latency thread. Is this a problem that exists with Xfree86 3.3.x as well or is this a new problem only?
Thanks, Daniel
>From: Erwin Rol <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: Michel D�nzer <[EMAIL PROTECTED]>
>CC: Kevin Brosius <[EMAIL PROTECTED]>, [EMAIL PROTECTED], XFree List <[EMAIL PROTECTED]>, RT-Linux Group <[EMAIL PROTECTED]>
>Subject: [rtl] Re: Virge DX and accel. introduced latency? (was Re: [Xpert] XFree86in realtime applications)
>Date: Fri, 24 Nov 2000 21:04:48 +0100
>
>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 D�nzer 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 D�nzer (MrCooper) \ CS student and free software enthusiast
> > Debian GNU/Linux (powerpc,i386) user \ member of XFree86 and The DRI Project
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