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Date: Sun, 02 Dec 2001 17:21:08 +0100
From: Martin Dalecki <dalecki@evision-ventures.com>
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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
CC: Larry McVoy <lm@bitmover.com>, Davide Libenzi <davidel@xmailserver.org>,
        Andrew Morton <akpm@zip.com.au>,
        Daniel Phillips <phillips@bonn-fries.net>,
        Henning Schmiedehausen <hps@intermeta.de>,
        Jeff Garzik <jgarzik@mandrakesoft.com>, linux-kernel@vger.kernel.org
Subject: Re: Linux/Pro [was Re: Coding style - a non-issue]
In-Reply-To: <E16A75O-0006hY-00@the-village.bc.nu>
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Alan Cox wrote:
> 
> > > Wasn't it you that were saying that Linux will never scale with more than
> > > 2 CPUs ?
> >
> > No, that wasn't me.  I said it shouldn't scale beyond 4 cpus.  I'd be pretty
> > lame if I said it couldn't scale with more than 2.  Should != could.
> 
> Question: What happens when people stick 8 threads of execution on a die with
> a single L2 cache ?

That had been already researched. Gogin bejoind 2 threads on a single
CPU
engine doesn't give you very much... The first step is giving about 25%
the second only about 5%. There are papers in the IBM research magazine
on
this topic in context of the PowerPC.
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