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.
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...)
Now, I've never seen a complete list of servers/cards with this problem... Is
there one at all?
//David
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