linux-kernel - Re: Mainline kernel OLTP performance update

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Date:	Thu, 12 Feb 2009 18:07:51 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	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

Hi Christoph,

On Thu, 12 Feb 2009, Zhang, Yanmin wrote:
>> The default order of kmalloc-8192 on 2*4 stoakley is an issue of calculate_order.
>>
>>
>> slab_size       order           name
>> -------------------------------------------------
>> 4096            3               sgpool-128
>> 8192            2               kmalloc-8192
>> 16384           3               kmalloc-16384
>>
>> kmalloc-8192's default order is smaller than sgpool-128's.

On Thu, Feb 12, 2009 at 5:25 PM, Christoph Lameter
<cl@...ux-foundation.org> wrote:
> You reverted the page allocator passthrough patch before this right?
> Otherwise kmalloc-8192 should not exist and allocation calls for 8192
> bytes would be converted inline to request of an order 1 page from the
> page allocator.

Yup, I assume that's the case here.
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