Re: wake_up() from interrupt - on the next jiffie?

[gl@dsa-ac.de]

Solved (below).

On Mon, 4 Jul 2005 gl@dsa-ac.de wrote:

> This might well be my basic misunderstanding, or the test was wrong, but
> the probability is pretty low, so, asking here.
>
> I thought, if a task sleeps on, say, read() and then data come and there's
> no other runnable task with a higher priority, the sleeping task should be
> woken up immediately. My test showed that the task is only woken up on the
> next jiffie. Kernel 2.6.11.10.
>
> Details: a program does a cfmakeraw() on a ttyS, and does blocking reads

setserial low_latency solves the problem. Thanks for not answering:-)

Thanks
Guennadi
---------------------------------
Guennadi Liakhovetski, Ph.D.
DSA Daten- und Systemtechnik GmbH
Pascalstr. 28
D-52076 Aachen
Germany
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