linux-kernel - Re: Mainline kernel OLTP performance update

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Message-ID: <20090115135236.GB29283@parisc-linux.org>
Date:	Thu, 15 Jan 2009 06:52:36 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Wilcox, Matthew R" <matthew.r.wilcox@...el.com>,
	chinang.ma@...el.com, linux-kernel@...r.kernel.org,
	sharad.c.tripathi@...el.com, arjan@...ux.intel.com,
	andi.kleen@...el.com, suresh.b.siddha@...el.com,
	harita.chilukuri@...el.com, douglas.w.styner@...el.com,
	peter.xihong.wang@...el.com, hubert.nueckel@...el.com,
	chris.mason@...cle.com, srostedt@...hat.com,
	linux-scsi@...r.kernel.org,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	Anirban Chakraborty <anirban.chakraborty@...gic.com>
Subject: Re: Mainline kernel OLTP performance update

On Thu, Jan 15, 2009 at 11:46:09AM +0200, Pekka Enberg wrote:
> It would also be nice if someone could do the performance analysis on
> the SLUB bug. I ran sysbench in oltp mode here and the results look
> like this:
> 
>   [ number of transactions per second from 10 runs. ]
> 
>                    min      max      avg      sd
>   2.6.29-rc1-slab  833.77   852.32   845.10   4.72
>   2.6.29-rc1-slub  823.61   851.94   836.74   8.57
> 
> And no, the numbers are not flipped, SLUB beats SLAB here. :(

Um.  More transactions per second is good.  Your numbers show SLAB
beating SLUB (even on your dual-CPU system).  And SLAB shows a lower
standard deviation, which is also good.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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