8xx SCC and SMC uart latency

[Wolfgang Denk]

In message <5.1.0.14.2.20030115075248.02669e88 at falcon.si.com> you wrote:
>
> The idea is that your processing task waits on a semaphore: when someone
> has something for it to do, they release (post/signal) the semaphore which
> unblocks the processing task.  This allows the processing task to (a) not
> consume processor resources when it doesn't have anything to do and (b)
> start up immediately when there is something to do (as opposed to having to
> wait for its slice of processor time).

Since serial and network I/O are involved, the "semaphore"  might  be
as simple as a select(), of course.

But that does not fix any scheduling latencies.

Best regards,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
Work 8 hours, sleep 8 hours; but not the same 8 hours.

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/