linux-kernel - Re: [patch 4/4] powerpc 2.6.21-rt1: reduce scheduling latency by changing tlb flush size

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Message-Id: <1179125506.22481.297.camel@localhost.localdomain>
Date:	Mon, 14 May 2007 08:51:46 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Tsutomu OWA <tsutomu.owa@...hiba.co.jp>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu
Subject: Re: [patch 4/4] powerpc 2.6.21-rt1: reduce scheduling latency by
	changing tlb flush size

Tsutomu-san,

On Mon, 2007-05-14 at 15:38 +0900, Tsutomu OWA wrote:
> Oopps, Subject was wrong.... resending it.  Sorry.
> 
> To reduce scheduling latecy by changing tlb flush size to 1.
> Since tlb flush on Celleb is done by calling (an) expensive hypervisor call(s), 
> it takes a long time to flush tlbs and causes scheduing latency.
> 
> As I don't know how long it takes on other platforms, it would be better to 
> enclose it within #ifdef CONFIG_PPC_CELLEB.

Yes, that might be appropriate. Can you add this and resend please ?

	tglx


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