From owner-freebsd-smp  Wed May 22 12:41:26 2002
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Date: Wed, 22 May 2002 20:40:46 +0100
From: Christoph Hellwig <hch@infradead.org>
To: Terry Lambert <tlambert2@mindspring.com>
Cc: Brooks Davis <brooks@one-eyed-alien.net>,
	Alfred Perlstein <bright@mu.org>,
	"Dorr H. Clark" <dclark@applmath.scu.edu>, freebsd-smp@freebsd.org
Subject: Re: hyperthreading: myth or legend? (was Re: hyperthreading? (was Re: question))
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References: <20020514222840.GB1585@elvis.mu.org> <Pine.GHP.4.21.0205220940410.28331-100000@hpux38.dc.engr.scu.edu> <20020522172759.GV54960@elvis.mu.org> <3CEBE6FD.626DC5DD@mindspring.com> <20020522115812.A7330@Odin.AC.HMC.Edu> <3CEBF100.DBF563D5@mindspring.com>
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In-Reply-To: <3CEBF100.DBF563D5@mindspring.com>; from tlambert2@mindspring.com on Wed, May 22, 2002 at 12:26:56PM -0700
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On Wed, May 22, 2002 at 12:26:56PM -0700, Terry Lambert wrote:
> Windows does not have the necessary affinity support in their scheduler;
> if you read the PDF whose reference I posted, you will wee that that is
> the case.  The only OS with the affinity support is "upcoming Linux 7.1"
> at the time of the publication of the PDF -- in other words, Red Hat
> Linux 7.1.
> 
> Even so, their affinity is broken.  You simply can not put affinity
> into a scheduler, and solve the problem with a single run queue.

The latest RH kernel updates also have a mutiqueue scheduler.
In Linux there is absolutely no sane mapping from version numbers to
features, so it's not easy to figure out 8)


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