linux-kernel - Re: SLUB performance regression vs SLAB

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Message-ID: <20071005123711.GR5711@kernel.dk>
Date:	Fri, 5 Oct 2007 14:37:11 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Matthew Wilcox <matthew@....cx>
Cc:	David Chinner <dgc@....com>, David Miller <davem@...emloft.net>,
	cebbert@...hat.com, 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,
	suresh.b.siddha@...el.com
Subject: Re: SLUB performance regression vs SLAB

On Fri, Oct 05 2007, Matthew Wilcox wrote:
> On Fri, Oct 05, 2007 at 08:48:53AM +0200, Jens Axboe wrote:
> > I'd like to second Davids emails here, this is a serious problem. Having
> > a reproducible test case lowers the barrier for getting the problem
> > fixed by orders of magnitude. It's the difference between the problem
> > getting fixed in a day or two and it potentially lingering for months,
> > because email ping-pong takes forever and "the test team has moved on to
> > other tests, we'll let you know the results of test foo in 3 weeks time
> > when we have a new slot on the box" just removing any developer
> > motivation to work on the issue.
> 
> I vaguely remembered something called orasim, so I went looking for it.
> I found http://oss.oracle.com/~wcoekaer/orasim/ which is dated from
> 2004, and I found http://oss.oracle.com/projects/orasimjobfiles/ which
> seems to be a stillborn project.  Is there anything else I should know
> about orasim?  ;-)

I don't know much about orasim, except that internally we're trying to
use fio for that instead. As far as I know, it was a project that was
never feature complete (or completed all together, for that matter).

-- 
Jens Axboe

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