On 4/5/07, Artur Skawina <[EMAIL PROTECTED]> 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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