Subject: Re: Mainline kernel OLTP performance update
From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
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>
In-Reply-To: <alpine.DEB.1.10.0901261235270.1908@qirst.com>
References: <BC02C49EEB98354DBA7F5DD76F2A9E800317003CB0@azsmsx501.amr.corp.intel.com>
	 <200901161503.13730.nickpiggin@yahoo.com.au>
	 <20090115201210.ca1a9542.akpm@linux-foundation.org>
	 <200901161746.25205.nickpiggin@yahoo.com.au>
	 <20090116065546.GJ31013@parisc-linux.org>
	 <1232092430.11429.52.camel@ymzhang>  <87sknjeemn.fsf@basil.nowhere.org>
	 <1232428583.11429.83.camel@ymzhang>
	 <alpine.DEB.1.10.0901211852060.18367@qirst.com>
	 <1232613395.11429.122.camel@ymzhang>
	 <1232615707.14549.6.camel@penberg-laptop>
	 <1232616517.11429.129.camel@ymzhang>
	 <1232617672.14549.25.camel@penberg-laptop>
	 <1232679773.11429.155.camel@ymzhang>  <4979692B.3050703@cs.helsinki.fi>
	 <1232697998.6094.17.camel@penberg-laptop>
	 <1232699401.11429.163.camel@ymzhang>
	 <1232703989.6094.29.camel@penberg-laptop>
	 <alpine.DEB.1.10.0901231020030.21692@qirst.com>
	 <1232765728.11429.193.camel@ymzhang>
	 <alpine.DEB.1.10.0901261235270.1908@qirst.com>
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Date: Sun, 01 Feb 2009 10:52:56 +0800
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On Mon, 2009-01-26 at 12:36 -0500, Christoph Lameter wrote:
> On Sat, 24 Jan 2009, Zhang, Yanmin wrote:
> 
> > 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
> 
> This is because 4 is more than the maximum allowed order. You can
> reconfigure that by setting
> 
> slub_max_order=5
> 
> or so on boot.
With ﻿slub_max_order=5, the default order of﻿ 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.


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