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

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Message-ID: <20061130202034.GB14696@elte.hu>
Date:	Thu, 30 Nov 2006 21:20:34 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Wenji Wu <wenji@...l.gov>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	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


* Wenji Wu <wenji@...l.gov> wrote:

> >The solution is really simple and needs no kernel change at all: if 
> >you want the TCP receiver to get a larger share of timeslices then 
> >either renice it to -20 or renice the other tasks to +19.
> 
> Simply give a larger share of timeslices to the TCP receiver won't 
> solve the problem.  No matter what the timeslice is, if the TCP 
> receiving process has packets within backlog, and the process is 
> expired and moved to the expired array, RTO might happen in the TCP 
> sender.

if you still have the test-setup, could you nevertheless try setting the 
priority of the receiving TCP task to nice -20 and see what kind of 
performance you get?

	Ingo
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