linux-kernel - Re: SLUB performance regression vs SLAB

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Message-Id: <20071004.141113.08322956.davem@davemloft.net>
Date:	Thu, 04 Oct 2007 14:11:13 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	cebbert@...hat.com
Cc:	willy@...ux.intel.com, clameter@....com, nickpiggin@...oo.com.au,
	hch@....de, mel@...net.ie, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, dgc@....com, jens.axboe@...cle.com,
	suresh.b.siddha@...el.com
Subject: Re: SLUB performance regression vs SLAB

From: Chuck Ebbert <cebbert@...hat.com>
Date: Thu, 04 Oct 2007 17:02:17 -0400

> How do you simulate reading 100TB of data spread across 3000 disks,
> selecting 10% of it using some criterion, then sorting and
> summarizing the result?

You repeatedly read zeros from a smaller disk into the same amount of
memory, and sort that as if it were real data instead.

You're not thinking outside of the box, and you need to do that to
write good test cases and fix kernel bugs effectively.
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