linux-kernel - Re: Mainline kernel OLTP performance update

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Date:	Thu, 12 Feb 2009 18:03:32 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Matthew Wilcox <matthew@....cx>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, Stephen Rothwell <sfr@...b.auug.org.au>,
	matthew.r.wilcox@...el.com, chinang.ma@...el.com,
	linux-kernel@...r.kernel.org, sharad.c.tripathi@...el.com,
	arjan@...ux.intel.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@...gic.com,
	anirban.chakraborty@...gic.com, Ingo Molnar <mingo@...e.hu>
Subject: Re: Mainline kernel OLTP performance update

On Sat, 2009-01-24 at 09:36 +0200, Pekka Enberg wrote:
> > > On Fri, 2009-01-23 at 10:22 -0500, Christoph Lameter wrote:
> > > >> No there is another way. Increase the allocator order to 3 for the
> > > >> kmalloc-8192 slab then multiple 8k blocks can be allocated from one of the
> > > >> larger chunks of data gotten from the page allocator. That will allow slub
> > > >> to do fast allocs.
> > > 
> > > On Sat, Jan 24, 2009 at 4:55 AM, Zhang, Yanmin
> > > <yanmin_zhang@...ux.intel.com> wrote:
> > > > After I change kmalloc-8192/order to 3, the result(pinned netperf UDP-U-4k)
> > > > difference between SLUB and SLQB becomes 1% which can be considered as fluctuation.
> > > 
> > > Great. We should fix calculate_order() to be order 3 for kmalloc-8192.
> > > Are you interested in doing that?

On Thu, 2009-02-12 at 13:22 +0800, Zhang, Yanmin wrote:
> > Pekka,
> > 
> > Sorry for the late update.
> > The default order of kmalloc-8192 on 2*4 stoakley is really an issue of calculate_order.

On Thu, 2009-02-12 at 13:47 +0800, Zhang, Yanmin wrote:
> Oh, previous patch has a compiling warning. Pls. use below patch.
> 
> From: Zhang Yanmin <yanmin.zhang@...ux.intel.com>
> 
> The default order of kmalloc-8192 on 2*4 stoakley is an issue of calculate_order.

Applied to the 'topic/slub/perf' branch. Thanks!

			Pekka

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