Messages in this thread | | | Date | Fri, 02 Jul 1999 13:38:58 -0400 | From | Dong Liu <> | Subject | Re: Can't sleep less than 20 ms |
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Andrea Arcangeli wrote: > > On Thu, 1 Jul 1999, Dong Liu wrote: > > >I know Linux on i386 has a timer resolution of 10 ms, but > >why I can't sleep for 10 ms, I can only sleep at > >interval of 20 , 30, 40 ... ms. > > > >This what happpends > > > >usleep ( <= 10*1000) will sleep for 20 ms > >usleep ( <10*1000 <= 20*1000) will sleep for 30 ms > >usleep ( <20*1000 <= 30*1000) will sleep for 40 ms > > > >I'm runing 2.2.10. > > Set the policy of the scheduler as RT. >
It works only when sleeping less than 2 ms, and the kernel actually does a busy loop. Since the timer resolution is 10ms, I expect I should be able to sleep (give up CPU) for 10ms.
Dong
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