linux-kernel - Re: [PATCH] SLUB use cmpxchg

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Message-ID: <Pine.LNX.4.64.0708211630240.6062@schroedinger.engr.sgi.com>
Date:	Tue, 21 Aug 2007 16:35:30 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	mingo@...hat.com
Subject: Re: [PATCH] SLUB use cmpxchg_local

On Tue, 21 Aug 2007, Mathieu Desnoyers wrote:

> * cmpxchg_local Slub test
> kmalloc(8) = 83 cycles	    kfree = 363 cycles
> kmalloc(16) = 85 cycles	    kfree = 372 cycles
> kmalloc(32) = 92 cycles	    kfree = 377 cycles
> kmalloc(64) = 115 cycles	  kfree = 397 cycles
> kmalloc(128) = 179 cycles	  kfree = 438 cycles

So for consecutive allocs of small slabs up to 128 bytes this effectively 
doubles the speed of kmalloc.

> kmalloc(256) = 314 cycles	  kfree = 564 cycles
> kmalloc(512) = 398 cycles	  kfree = 615 cycles
> kmalloc(1024) = 573 cycles	kfree = 745 cycles

Less of a benefit.

> kmalloc(2048) = 629 cycles	kfree = 816 cycles

Allmost as before.

> kmalloc(4096) = 473 cycles	kfree = 548 cycles
> kmalloc(8192) = 659 cycles	kfree = 745 cycles
> kmalloc(16384) = 724 cycles	kfree = 843 cycles

Page allocator pass through measurements.
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