linux-kernel - Re: scheduler scalability - cgroups, cpusets and load-balancing

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Date:	Tue, 29 Jan 2008 15:02:34 -0600
From:	Paul Jackson <pj@....com>
To:	"Gregory Haskins" <ghaskins@...ell.com>
Cc:	a.p.zijlstra@...llo.nl, mingo@...e.hu, dmitry.adamushko@...il.com,
	rostedt@...dmis.org, menage@...gle.com, rientjes@...gle.com,
	tong.n.li@...el.com, tglx@...utronix.de, akpm@...ux-foundation.org,
	dhaval@...ux.vnet.ibm.com, vatsa@...ux.vnet.ibm.com,
	sgrubb@...hat.com, linux-kernel@...r.kernel.org,
	ebiederm@...ssion.com, nickpiggin@...oo.com.au
Subject: Re: scheduler scalability - cgroups, cpusets and load-balancing

Gregory wrote:
> > ... (1) turning off
> > sched_load_balance in any overlapping cpusets, including all
> > encompassing parent cpusets, (2) leaving sched_load_balance on in the
> > RT cpuset itself, and ...
>
> Technically you only need (2).  I run my 4-8 core development systems
> in the single default global cpuset, normally.

Well, if you're running in the default cpuset, then you automatically get (1),
because sched_load_balance is turned off in all overlapping cpusets (there
aren't any overlapping cpusets!)

So, yes, you -do- need both (1) and (2).  In your normal system, you
just happen to get (1) effortlessly.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.940.382.4214
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