linux-kernel - Re: SLUB performance regression vs SLAB

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Date:	05 Oct 2007 13:12:30 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>, 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

Jens Axboe <jens.axboe@...cle.com> writes:
> 
> Writing a small test module to exercise slub/slab in various ways
> (allocating from all cpus freeing from one, as described) should not be
> too hard. Perhaps that would be enough to find this performance
> discrepancy between slab and slub?

You could simulate that by just sending packets using unix sockets 
between threads bound to different CPUs. Sending a packet allocates; receiving 
deallocates.

But it's not clear that will really simulate the cache bounce environment
of the database test. I don't think all passing of data between CPUs 
using slub objects is slow.

-Andi
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