From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Subject: Re: Mainline kernel OLTP performance update
Date: Sun, 01 Feb 2009 10:52:56 +0800
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To: Christoph Lameter <cl@linux-foundation.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>, Andi Kleen <andi@firstfloor.org>, Matthew Wilcox <matthew@wil.cx>, Nick Piggin <nickpiggin@yahoo.com.au>, Andrew Morton <akpm@linux-foundation.org>, netdev@vger.kernel.org, Stephen Rothwell <sfr@canb.auug.org.au>, matthew.r.wilcox@intel.com, chinang.ma@intel.com, linux-kernel@vger.kernel.org, sharad.c.tripathi@intel.com, arjan@linux.intel.com, suresh.b.siddha@intel.com, harita.chilukuri@intel.com, douglas.w.styner@intel.com, peter.xihong.wang@intel.com, hubert.nueckel@intel.com, chris.mason@oracle.com, srostedt@redhat.com, linux-scsi@vger.kernel.org, andrew.vasquez@qlogic.com, anirban.chakraborty@qlogic.com, Ingo Molnar <mingo@elte.hu>
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On Mon, 2009-01-26 at 12:36 -0500, Christoph Lameter wrote:
> On Sat, 24 Jan 2009, Zhang, Yanmin wrote:
>=20
> > But when trying to increased it to 4, I got:
> > [root@lkp-st02-x8664 slab]# echo "3">kmalloc-8192/order
> > [root@lkp-st02-x8664 slab]# echo "4">kmalloc-8192/order
> > -bash: echo: write error: Invalid argument
>=20
> This is because 4 is more than the maximum allowed order. You can
> reconfigure that by setting
>=20
> slub_max_order=3D5
>=20
> or so on boot.
With =EF=BB=BFslub_max_order=3D5, the default order of=EF=BB=BF kmalloc=
-8192 becomes
5. I tested it with netperf UDP-U-4k and the result difference from
SLAB/SLQB is less than 1% which is really fluctuation.