linux-kernel - Re: [SLUB 0/3] SLUB: The unqueued slab allocator V4

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Message-ID: <Pine.LNX.4.64.0703090907330.7315@schroedinger.engr.sgi.com>
Date:	Fri, 9 Mar 2007 09:21:00 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Mel Gorman <mel@....ul.ie>
cc:	akpm@...l.org, Marcelo Tosatti <marcelo@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	mpm@...enic.com, Manfred Spraul <manfred@...orfullife.com>
Subject: Re: [SLUB 0/3] SLUB: The unqueued slab allocator V4

On Fri, 9 Mar 2007, Mel Gorman wrote:

> The results without slub_debug were not good except for IA64. x86_64 and ppc64
> both blew up for a variety of reasons. The IA64 results were

Yuck that is the dst issue that Adrian is also looking at. Likely an issue 
with slab merging and RCU frees.
 
> KernBench Comparison
> --------------------
>                           2.6.21-rc2-mm2-clean       2.6.21-rc2-mm2-slub
> %diff
> User   CPU time                        1084.64                   1032.93 4.77%
> System CPU time                          73.38                     63.14 13.95%
> Total  CPU time                        1158.02                   1096.07 5.35%
> Elapsed    time                         307.00                    285.62 6.96%

Wow! The first indication that we are on the right track with this.

> AIM9 Comparison
>  2 page_test               2097119.26                 3398259.27 1301140.01 62.04% System Allocations & Pages/second

Wow! Must have all stayed within slab boundaries.

>  8 link_test                 64776.04                    7488.13  -57287.91 -88.44% Link/Unlink Pairs/second

Crap. Maybe we straddled a slab boundary here?
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