Re: [PATCH 07/41] cpuset: Set up interface for nohz flag
From: Mike Galbraith
Date: Tue May 08 2012 - 15:50:13 EST
On Tue, 2012-05-08 at 18:16 +0200, Peter Zijlstra wrote:
> On Tue, 2012-05-08 at 10:57 -0500, Christoph Lameter wrote:
> isolcpus is a very limited hack that adds more pain that its worth. Its
> yet another mask to check and its functionality is completely available
> through cpusets.
Agreed.
> You cannot create multi-cpu partitions using isolcpus, you cannot
> dynamically reconfigure it.
Big plus for cpusets.
> And on the scheduler side cpusets doesn't add runtime overhead to normal
> things, only sched_setaffinity() and a few other rare operations get
> slightly more expensive. And it allows to reduce runtime overhead by
> making the load-balancer domains smaller.
Very big deal if you have a load that doesn't do all the performance 'i'
dotting and 't' crossing it maybe could have, but ends up on a big box.
-Mike
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