From: Christoph Lameter <cl@linux.com>
To: David Rientjes <rientjes@google.com>
Cc: Pekka Enberg <penberg@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
hughd@google.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [GIT PULL] Lockless SLUB slowpaths for v3.1-rc1
Date: Tue, 2 Aug 2011 09:15:03 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1108020913180.18965@router.home> (raw)
In-Reply-To: <alpine.DEB.2.00.1108012101310.6871@chino.kir.corp.google.com>
On Mon, 1 Aug 2011, David Rientjes wrote:
> On Mon, 1 Aug 2011, Pekka Enberg wrote:
>
> > Btw, I haven't measured this recently but in my testing, SLAB has
> > pretty much always used more memory than SLUB. So 'throwing more
> > memory at the problem' is definitely a reasonable approach for SLUB.
> >
>
> Yes, slub _did_ use more memory than slab until the alignment of
> struct page. That cost an additional 128MB on each of these 64GB
> machines, while the total slab usage on the client machine systemwide is
> ~75MB while running netperf TCP_RR with 160 threads.
I guess that calculation did not include metadata structures (alien caches
and the NR_CPU arrays in kmem_cache) etc? These are particularly costly on SLAB.
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next prev parent reply other threads:[~2011-08-02 14:15 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-28 22:47 Pekka Enberg
2011-07-29 15:04 ` Christoph Lameter
2011-07-29 23:18 ` Andi Kleen
2011-07-30 6:33 ` Eric Dumazet
2011-07-31 18:50 ` David Rientjes
2011-07-31 20:24 ` David Rientjes
2011-07-31 20:45 ` Pekka Enberg
2011-07-31 21:55 ` David Rientjes
2011-08-01 5:08 ` Pekka Enberg
2011-08-01 10:02 ` David Rientjes
2011-08-01 12:45 ` Pekka Enberg
2011-08-02 2:43 ` David Rientjes
2011-08-01 12:06 ` Pekka Enberg
2011-08-01 15:55 ` Christoph Lameter
2011-08-02 4:05 ` David Rientjes
2011-08-02 14:15 ` Christoph Lameter [this message]
2011-08-02 16:24 ` David Rientjes
2011-08-02 16:36 ` Christoph Lameter
2011-08-02 20:02 ` David Rientjes
2011-08-03 14:09 ` Christoph Lameter
2011-08-08 20:04 ` David Rientjes
2011-07-30 18:27 ` Linus Torvalds
2011-07-30 18:32 ` Linus Torvalds
2011-07-31 17:39 ` Andi Kleen
2011-08-01 0:22 ` KAMEZAWA Hiroyuki
2011-07-31 18:11 ` David Rientjes
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