From: Andi Kleen <ak@suse.de>
To: Christoph Lameter <clameter@sgi.com>
Cc: Nick Piggin <npiggin@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>,
linux-mm@kvack.org, Pekka J Enberg <penberg@cs.helsinki.fi>
Subject: Re: Fastpath prototype?
Date: Wed, 13 Feb 2008 12:38:19 +0100 [thread overview]
Message-ID: <47B2D6AB.1020408@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.64.0802121426060.9829@schroedinger.engr.sgi.com>
Christoph Lameter wrote:
> Here is a patch to remove the pcp lists (just in case someone wants to toy
> around with these things too). It hits tbench/SLUB badly because that
> relies heavily on effective caching by the page allocator
>
> tbench/SLUB: 726.25 MB/sec
>
> Even adding the fast path prototype (covers only slab allocs >=4K
> allocs) yields only 1825.68 MB/sec
So why is the new fast path slower than the old one? Because it is not
NUMA aware?
-Andi
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next prev parent reply other threads:[~2008-02-13 11:38 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-09 21:45 SLUB tbench regression due to page allocator deficiency Christoph Lameter
2008-02-09 22:35 ` Andrew Morton
2008-02-10 0:19 ` Christoph Lameter
2008-02-10 2:45 ` Nick Piggin
2008-02-10 3:36 ` Christoph Lameter
2008-02-10 3:39 ` Christoph Lameter
2008-02-10 23:24 ` Nick Piggin
2008-02-11 19:14 ` Christoph Lameter
2008-02-11 22:03 ` Christoph Lameter
2008-02-11 7:18 ` Nick Piggin
2008-02-11 19:21 ` Christoph Lameter
2008-02-11 23:40 ` Nick Piggin
2008-02-11 23:42 ` Christoph Lameter
2008-02-11 23:56 ` Nick Piggin
2008-02-12 0:08 ` Christoph Lameter
2008-02-12 6:06 ` Fastpath prototype? Christoph Lameter
2008-02-12 10:40 ` Andi Kleen
2008-02-12 20:10 ` Christoph Lameter
2008-02-12 22:31 ` Christoph Lameter
2008-02-13 11:38 ` Andi Kleen [this message]
2008-02-13 20:09 ` Christoph Lameter
2008-02-13 18:33 ` SLUB tbench regression due to page allocator deficiency Paul Jackson
2008-02-11 13:50 ` Mel Gorman
2008-02-13 11:15 ` Mel Gorman
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