linux-kernel - Re: Mainline kernel OLTP performance update

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Message-ID: <20090127082814.GN30821@kernel.dk>
Date:	Tue, 27 Jan 2009 09:28:14 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	"Chilukuri, Harita" <harita.chilukuri@...el.com>
Cc:	Matthew Wilcox <matthew@....cx>, Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Wilcox, Matthew R" <matthew.r.wilcox@...el.com>,
	"Ma, Chinang" <chinang.ma@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Tripathi, Sharad C" <sharad.c.tripathi@...el.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Styner, Douglas W" <douglas.w.styner@...el.com>,
	"Wang, Peter Xihong" <peter.xihong.wang@...el.com>,
	"Nueckel, Hubert" <hubert.nueckel@...el.com>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"srostedt@...hat.com" <srostedt@...hat.com>,
	"linux-scsi@...r.kernel.org" <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 Mon, Jan 26 2009, Chilukuri, Harita wrote:
> Jens, we did test the patch that disables the whole stats. We get 0.5% gain with this patch on 2.6.29-rc2 comparing to 2.6.29-rc2-disbale_part_stats
> 
> Below is the description of the result:
> 
> Linux OLTP Performance summary
> Kernel#                               Speedup(x) Intr/s  CtxSw/s  us%    sys%    idle% iowait%
> 2.6.29-rc2-disbale_partition_stats     1.000    30413   42582    74      25      0       0
> 2.6.29-rc2-disable_all                 1.005    30401   42656    74      25      0       0
> 
> Server configurations:
> Intel Xeon Quad-core 2.0GHz  2 cpus/8 cores/8 threads
> 64GB memory, 3 qle2462 FC HBA, 450 spindles (30 logical units)

OK, so about the same, which means the lookup is likely the expensive
bit. I have merged this patch:

http://git.kernel.dk/?p=linux-2.6-block.git;a=commit;h=e5b74b703da41fab060adc335a0b98fa5a5ea61d

which exposes an 'iostats' toggle that allows users to disable disk
statistics completely.

-- 
Jens Axboe

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