Re: Can't sleep less than 20 ms
Dong Liu (dongliu@lucent.com)
Fri, 02 Jul 1999 13:38:58 -0400
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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