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Date: Wed, 14 Aug 2002 07:49:51 -0700 (PDT)
From: Linus Torvalds <torvalds@transmeta.com>
To: Rik van Riel <riel@conectiva.com.br>
cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       "Martin J. Bligh" <Martin.Bligh@us.ibm.com>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Matt Dobson <colpatch@us.ibm.com>
Subject: Re: [PATCH] NUMA-Q disable irqbalance
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On Tue, 13 Aug 2002, Rik van Riel wrote:
> 
> As a clarification to this, I'm not suggesting that interactive
> performance doesn't exist, I'm suggesting that we should measure
> it.

I think the only way to measure it is with a latency measurement thing - 
like the one used for some of the RT tuning.

However, the latency measurement should not care too much about individual
millisecond latencies, but only holler when it finds _combined_ bad
latencies in the 1/10+ second range (which is human-perceptible).

One problem is trying to find a good load for the tester program itself
(it should not just sit in a tight loop, it should have a memory footprint
and some delays of its own).

		Linus

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