Subject: Re: Interactivity improvements
From: Robert Love <rml@tech9.net>
To: Patrick McLean <pmclean@cs.ubishops.ca>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <3F3261A2.9000405@cs.ubishops.ca>
References: <3F3261A2.9000405@cs.ubishops.ca>
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Date: Thu, 07 Aug 2003 10:41:18 -0700
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On Thu, 2003-08-07 at 07:26, Patrick McLean wrote:

> Finally, the interactivity estimator seems to be quite a bit of code, 
> which certain people have no real useful (in servers for example) and I 
> would imagine that it does reduce throughput

Actually, it should improve I/O throughput. What it might hurt is
computational performance, but only at the expense of benefiting other
processes.

The reason it benefits throughput is that file I/O is definitely marked
interactive, and that results in file I/O being able to quickly wake up,
dispatch the I/O, and go back to sleep. Its the usual treatment given to
I/O, and it works.

	Robert Love


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