linux-kernel - Re: Mainline kernel OLTP performance update

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Message-ID: <alpine.DEB.1.10.0901261235270.1908@qirst.com>
Date:	Mon, 26 Jan 2009 12:36:05 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	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, 24 Jan 2009, Zhang, Yanmin wrote:

> But when trying to increased it to 4, I got:
> [root@...-st02-x8664 slab]# echo "3">kmalloc-8192/order
> [root@...-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.
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