linux-kernel - Re: The performance and behaviour of the anti-fragmentation related patches

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Date:	Fri, 02 Mar 2007 18:20:39 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Bill Irwin <bill.irwin@...cle.com>,
	Christoph Lameter <clameter@...r.sgi.com>,
	Mel Gorman <mel@...net.ie>, npiggin@...e.de, mingo@...e.hu,
	jschopp@...tin.ibm.com, arjan@...radead.org,
	torvalds@...ux-foundation.org, mbligh@...igh.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: The performance and behaviour of the anti-fragmentation related
 patches

Andrew Morton wrote:

> Somehow I don't believe that a person or organisation which is incapable of
> preparing even a simple testcase will be capable of fixing problems such as
> this without breaking things.

I don't believe anybody who relies on one simple test case will
ever be capable of evaluating a patch without breaking things.

Test cases can show problems, but fixing a test case is no
guarantee at all that your VM will behave ok with real world
workloads.  Test cases for the VM can *never* be relied on
to show that a problem went away.

I'll do my best, but I can't promise a simple test case
for every single problem that's plaguing the VM.

-- 
Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is.  Each group
calls the other unpatriotic.
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