On 4/5/07, Artur Skawina <art_k@xxxxx> wrote:
>
> Well, the streamdev-client reads data from a ringbuffer and when there
> isn't anything
> to read it tries to sleep for 1us and loops. This wasn't a problem when
> the timer
> resolution was in the 1000..10000us range (1000..100Hz); the usleep(1)
> call slept
> for one or more milliseconds.
> With the high-res timers in kernel 2.6.21+ usleep(1) is no longer treated
> as
> usleep(10000) and the streamdev client is almost unusable; it uses most of
> the cpu
> and causes hundreds of thousands context switches per second.
> This gets rid of the almost-busy-loop.
How about his approach?
--- streamdev/client/filter.c.orig 2007-04-05 20:45:04.000000000 -0700
+++ streamdev/client/filter.c 2007-04-05 20:45:44.000000000 -0700
@@ -135,7 +135,7 @@
}
m_RingBuffer->Del(TS_SIZE);
} else
- usleep(1);
+ cCondWait::SleepMs(1);
}
}
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