On Tuesday 20 March 2001 13:44, Erwin Rol wrote:
> 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.
Well, it *could* happen when fbdev is used with hardware acceleration
drivers... (AFAIK, it's normally all software apart from setting the mode up
and doing true page flipping.)
//David
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