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Subject: Re: [PATCH] NUMA-Q disable irqbalance
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: "Martin J. Bligh" <Martin.Bligh@us.ibm.com>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Matt Dobson <colpatch@us.ibm.com>
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Date: 13 Aug 2002 21:22:55 +0100
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On Tue, 2002-08-13 at 20:22, Linus Torvalds wrote:
> 
> On Tue, 13 Aug 2002, Martin J. Bligh wrote:
> > 
> > OK, I was being unclear, that's not really what I meant. If I may rephrase:
> > I don't like the performance hit it gives on P3 standard SMP machines (not
> > NUMA-Q) though it does work on there too, and there's no easy way for 
> > people to disable it.
> 
> Well, it makes performance _so_ much better on a P4 that it's not even 
> funny. It's basically a "P4 is unusable with SMP" without it.

On a collection of networking workloads the P4 is about 5% better
performing with the irq balancer off.

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