linux-kernel - Re: [RFC] cpuset: remove sched domain hooks from cpusets

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Message-Id: <20061022035135.2c450147.pj@sgi.com>
Date:	Sun, 22 Oct 2006 03:51:35 -0700
From:	Paul Jackson <pj@....com>
To:	Martin Bligh <mbligh@...gle.com>
Cc:	nickpiggin@...oo.com.au, akpm@...l.org, menage@...gle.com,
	Simon.Derr@...l.net, linux-kernel@...r.kernel.org, dino@...ibm.com,
	rohitseth@...gle.com, holt@....com, dipankar@...ibm.com,
	suresh.b.siddha@...el.com
Subject: Re: [RFC] cpuset: remove sched domain hooks from cpusets

Martin wrote:
> We (Google) are planning to use it to do some partitioning, albeit on
> much smaller machines. I'd really like to NOT use cpus_allowed from
> previous experience - if we can get it to to partition using separated
> sched domains, that would be much better.

Why not use cpus_allowed for this, via cpusets and/or sched_setaffinity?

In the followup to this between Paul M. and myself, I wrote:
> As best as I can tell, the two motivations for explicity setting
> sched domain partitions are:
>  1) isolating cpus for real time uses very sensitive to any interference,
>  2) handling load balancing on huge CPU counts, where the worse than linear
>     algorithms start to hurt.
> ...
> How many CPUs are you juggling?

And Paul M. replied:
> Not many by your standards - less than eight in general.

So ... it would seem you have neither huge CPU counts nor real time
sensitivities.

So why not use cpus_allowed?

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.925.600.0401
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