netdev - Re: [patch 1/4] - Potential performance bottleneck for Linxu TCP

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Date:	Thu, 30 Nov 2006 11:51:09 -0500
From:	Lee Revell <rlrevell@...-job.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Wenji Wu <wenji@...l.gov>, David Miller <davem@...emloft.net>,
	akpm@...l.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/4] - Potential performance bottleneck for Linxu TCP

On Thu, 2006-11-30 at 09:33 +0000, Christoph Hellwig wrote:
> On Wed, Nov 29, 2006 at 07:56:58PM -0600, Wenji Wu wrote:
> > Yes, when CONFIG_PREEMPT is disabled, the "problem" won't happen. That is why I put "for 2.6 desktop, low-latency desktop" in the uploaded paper. This "problem" happens in the 2.6 Desktop and Low-latency Desktop.
> 
> CONFIG_PREEMPT is only for people that are in for the feeling.  There is no
> real world advtantage to it and we should probably remove it again.

There certainly is a real world advantage for many applications.  Of
course it would be better if the latency requirements could be met
without kernel preemption but that's not the case now.

Lee

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