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

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Message-Id: <20061130.123853.10298783.davem@davemloft.net>
Date:	Thu, 30 Nov 2006 12:38:53 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	mingo@...e.hu
Cc:	johnpol@....mipt.ru, nickpiggin@...oo.com.au, wenji@...l.gov,
	akpm@...l.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/4] - Potential performance bottleneck for Linxu TCP

From: Ingo Molnar <mingo@...e.hu>
Date: Thu, 30 Nov 2006 21:30:26 +0100

> disk I/O is typically not CPU bound, and i believe these TCP tests /are/ 
> CPU-bound. Otherwise there would be no expiry of the timeslice to begin 
> with and the TCP receiver task would always be boosted to 'interactive' 
> status by the scheduler and would happily chug along at 500 mbits ...

It's about the prioritization of the work.

If all disk I/O were shut off and frozen while we copy file
data into userspace, you'd see the same problem for disk I/O.
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