On Mon, 23 Feb 2015, [email protected] wrote: > From: Rik van Riel <[email protected]> > > Ensure that cpus specified with the isolcpus= boot commandline > option stay outside of the load balancing in the kernel scheduler. > > Operations like load balancing can introduce unwanted latencies, > which is exactly what the isolcpus= commandline is there to prevent. > > Previously, simply creating a new cpuset, without even touching the > cpuset.cpus field inside the new cpuset, would undo the effects of > isolcpus=, by creating a scheduler domain spanning the whole system, > and setting up load balancing inside that domain. The cpuset root > cpuset.cpus file is read-only, so there was not even a way to undo > that effect. > > This does not impact the majority of cpusets users, since isolcpus= > is a fairly specialized feature used for realtime purposes. > > Cc: Peter Zijlstra <[email protected]> > Cc: Clark Williams <[email protected]> > Cc: Li Zefan <[email protected]> > Cc: Ingo Molnar <[email protected]> > Cc: Luiz Capitulino <[email protected]> > Cc: [email protected] > Signed-off-by: Rik van Riel <[email protected]>
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