linux-kernel - Re: [PATCH] i386-pda UP optimization

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Message-ID: <20061115183152.GA3160@elte.hu>
Date:	Wed, 15 Nov 2006 19:31:52 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Eric Dumazet <dada1@...mosbay.com>, Andi Kleen <ak@...e.de>,
	akpm@...l.org, Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i386-pda UP optimization


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> [...] However, when I measured segment register use timings, I didn't 
> see any dramatic costs associated with segment register use which 
> would account for a 5% hit in your benchmark.

if by that measurement you mean time-segops.c, i dont think it correctly 
measures 'mixed' use of different selector values for the same %gs 
segment selector. And that's what i suggested for you to measure in 
September, and that's what Eric's testcase triggers too.

	Ingo
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