linux-kernel - Re: [patch] queued spinlocks (i386)

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Message-ID: <75b66ecd0703292144x2dd9df30y3c316d54d2e5f7d@mail.gmail.com>
Date:	Fri, 30 Mar 2007 00:44:44 -0400
From:	"Lee Revell" <rlrevell@...-job.com>
To:	"Nick Piggin" <npiggin@...e.de>
Cc:	"Davide Libenzi" <davidel@...ilserver.org>,
	"Oleg Nesterov" <oleg@...sign.ru>,
	"Ravikiran G Thirumalai" <kiran@...lex86.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Nikita Danilov" <nikita@...sterfs.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Eric Dumazet" <dada1@...mosbay.com>
Subject: Re: [patch] queued spinlocks (i386)

On 3/29/07, Nick Piggin <npiggin@...e.de> wrote:
> On Thu, Mar 29, 2007 at 10:06:41PM -0400, Lee Revell wrote:
> > Until someone fixes all the places in the kernel where scheduling can
> > be held off for tens of milliseconds, CONFIG_PREEMPT will be an
> > absolute requirement for many applications like audio and gaming.
>
> There's nothing wrong with CONFIG_PREEMPT for those users. We have
> a few other performance concessions activated with CONFIG_PREEMPT on.
> I think a usual upper of a few miliseconds (especially for SMP) is
> reasonable for a non preempt kernel.

This is within reach - the only major offender left is
rt_secret_rebuild (and possibly other areas of the route cache
handling).  Eric Dumazet had some suggestions to fix it, but the
details are beyond my area of expertise.

Lee
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