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From: James Cleverdon <jamesclv@us.ibm.com>
Reply-To: jamesclv@us.ibm.com
Organization: IBM xSeries Linux Solutions
To: Zwane Mwaikambo <zwane@linuxpower.ca>,
       Linus Torvalds <torvalds@transmeta.com>
Subject: Re: [PATCH] NUMA-Q disable irqbalance
Date: Mon, 26 Aug 2002 18:23:55 -0700
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On Saturday 24 August 2002 05:19 am, Zwane Mwaikambo wrote:
> On Tue, 13 Aug 2002, Linus Torvalds wrote:
> > 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.
>
> Out of interest, does anyone have an idea of what Windows does?
>
> 	Zwane

I'm not allowed to report second hand rumors from the folks who assisted with 
the debug of the x440 HAL, so I won't mention that they may or may not be 
using clustered logical interrupts and adjusting priority with the TPR.

I can admit that I have no clue how they assign IRQs to APIC clusters, whether 
randomly or if they try some load balancing scheme.

-- 
James Cleverdon
IBM xSeries Linux Solutions
{jamesclv(Unix, preferred), cleverdj(Notes)} at us dot ibm dot com

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