From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: Mainline kernel OLTP performance update
Date: Fri, 23 Jan 2009 18:01:38 +0200
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Cc: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
	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>
To: Christoph Lameter <cl@linux-foundation.org>
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On Fri, 23 Jan 2009, Pekka Enberg wrote:
> > I wonder why that doesn't happen already, actually. The slub_max_order
> > know is capped to PAGE_ALLOC_COSTLY_ORDER ("3") by default and obviously
> > order 3 should be as good fit as order 2 so 'fraction' can't be too high
> > either. Hmm.

On Fri, 2009-01-23 at 10:55 -0500, Christoph Lameter wrote:
> The kmalloc-8192 is new. Look at slabinfo output to see what allocation
> orders are chosen.

Yes, yes, I know the new cache a result of my patch. I'm just saying
that AFAICT, the existing logic should set the order to 3 but IIRC
Yanmin said it's 2.

			Pekka