linux-kernel - Re: [PATCH 8/8] Convert PDA into the percpu section

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Date:	Wed, 07 Mar 2007 22:55:50 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Andi Kleen <ak@...e.de>
Cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Zachary Amsden <zach@...are.com>,
	Jeremy Fitzhardinge <jeremy@...source.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 8/8] Convert PDA into the percpu section

On Wed, 2007-03-07 at 11:33 +1100, Rusty Russell wrote:
> On Tue, 2007-03-06 at 20:34 +0100, Andi Kleen wrote:
> > Do you have text size comparisons before/after and possible lmbench? 
> 
> No, but I'll run them this evening.  Last time the size reduction was
> slight, and there was no measurable performance improvement in
> microbenchmarks.

Here are the size results, for a start:


UP:
Before:
size vmlinux
   text    data     bss     dec     hex filename
3094881  243110  221184 3559175  364f07 vmlinux

After:
size vmlinux 
   text    data     bss     dec     hex filename
3093409  243142  221184 3557735  364967 vmlinux

SMP:
Before:
size vmlinux
   text    data     bss     dec     hex filename
3222269  318770  237568 3778607  39a82f vmlinux

After:
size vmlinux
   text    data     bss     dec     hex filename
3221421  314674  237568 3773663  3994df vmlinux

(The data size changes are moving from pda -> percpu, and on SMP
removing the page-aligned PDA).

So, a slight win.  lmbench tomorrow...

Rusty.

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