Mike Galbraith | 20 Aug 07:54 2012

Re: changing timeslice in linux

On Sun, 2012-08-19 at 11:58 -0700, Xin Tong wrote: 
> I have 2 questions about linux 2.6 x86_64 scheduler.
> 1. is the default scheduling algorithm SCHED_NORMAL in linux ?


> 2. how do i change the time slice in linux source code ?

You shouldn't need to.  You can tune "slice" by adjusting
sched_latency_ns and sched_min_granularity_ns, but note that "slice" is
not a fixed quantum.  Also note that CFS preemption decisions are based
upon instantaneous state.  A task may have received a full (variable)
"slice" of CPU time, but preemption will be triggered only if a more
deserving task is available, so a "slice" is not the "max uninterrupted
CPU time" that you may expect it to be.. but it is somewhat similar.