linux-kernel - Re: Mainline kernel OLTP performance update

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Date:	Fri, 16 Jan 2009 12:16:31 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Matthew Wilcox" <matthew@....cx>
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>,
	"Christoph Lameter" <cl@...ux-foundation.org>
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. :(

On Thu, Jan 15, 2009 at 3:52 PM, Matthew Wilcox <matthew@....cx> wrote:
> 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.

I had lockdep enabled in my config so I ran the tests again with
x86-64 defconfig and I'm back to square one:

  [ number of transactions per second from 10 runs, bigger is better ]

                   min      max      avg      sd
  2.6.29-rc1-slab  802.02   805.37   803.93   0.97
  2.6.29-rc1-slub  807.78   811.20   809.86   1.05

                        Pekka
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