From: Christoph Lameter <clameter@sgi.com>
To: Matthew Wilcox <willy@linux.intel.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
Christoph Hellwig <hch@lst.de>, Mel Gorman <mel@skynet.ie>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
David Chinner <dgc@sgi.com>, Jens Axboe <jens.axboe@oracle.com>
Subject: Re: SLUB performance regression vs SLAB
Date: Thu, 4 Oct 2007 10:38:15 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0710041034550.10854@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20071004161621.GO12049@parisc-linux.org>
On Thu, 4 Oct 2007, Matthew Wilcox wrote:
> So, on "a well-known OLTP benchmark which prohibits publishing absolute
> numbers" and on an x86-64 system (I don't think exactly which model
> is important), we're seeing *6.51%* performance loss on slub vs slab.
> This is with a 2.6.23-rc3 kernel. Tuning the boot parameters, as you've
> asked for before (slub_min_order=2, slub_max_order=4, slub_min_objects=8)
> gets back 0.38% of that. It's still down 6.13% over slab.
Yeah the fastpath vs. slow path is not the issue as Siddha and I concluded
earlier. Seems that we are mainly seeing cacheline bouncing due to two
cpus accessing meta data in the same page struct. The patches in
MM that are scheduled to be merged for .24 address that issue. I
have repeatedly asked that these patches be tested. The patches were
posted months ago.
> Now, where do we go next? I suspect that 2.6.23-rc9 has significant
> changes since -rc3, but I'd like to confirm that before kicking off
> another (expensive) run. Please, tell me what useful kernels are to test.
I thought Siddha has a test in the works with the per cpu structure
patchset from MM? Could you sync up with Siddha?
next prev parent reply other threads:[~2007-10-04 17:38 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-19 3:36 [00/17] [RFC] Virtual Compound Page Support Christoph Lameter
2007-09-19 3:36 ` [01/17] Vmalloc: Move vmalloc_to_page to mm/vmalloc Christoph Lameter
2007-09-19 3:36 ` [02/17] Vmalloc: add const Christoph Lameter
2007-09-19 3:36 ` [03/17] is_vmalloc_addr(): Check if an address is within the vmalloc boundaries Christoph Lameter
2007-09-19 6:32 ` David Rientjes
2007-09-19 7:24 ` Anton Altaparmakov
2007-09-19 8:09 ` David Rientjes
2007-09-19 8:44 ` Anton Altaparmakov
2007-09-19 9:19 ` David Rientjes
2007-09-19 13:23 ` Anton Altaparmakov
2007-09-19 17:29 ` Christoph Lameter
2007-09-19 17:52 ` Anton Altaparmakov
2007-09-19 17:29 ` Christoph Lameter
2007-09-19 17:52 ` Anton Altaparmakov
2007-09-19 3:36 ` [04/17] vmalloc: clean up page array indexing Christoph Lameter
2007-09-19 3:36 ` [05/17] vunmap: return page array Christoph Lameter
2007-09-19 8:05 ` KAMEZAWA Hiroyuki
2007-09-19 22:15 ` Christoph Lameter
2007-09-20 0:47 ` KAMEZAWA Hiroyuki
2007-09-19 3:36 ` [06/17] vmalloc_address(): Determine vmalloc address from page struct Christoph Lameter
2007-09-19 3:36 ` [07/17] GFP_VFALLBACK: Allow fallback of compound pages to virtual mappings Christoph Lameter
2007-09-19 3:36 ` [08/17] Pass vmalloc address in page->private Christoph Lameter
2007-09-19 3:36 ` [09/17] VFALLBACK: Debugging aid Christoph Lameter
2007-09-19 3:36 ` [10/17] Use GFP_VFALLBACK for sparsemem Christoph Lameter
2007-09-19 3:36 ` [11/17] GFP_VFALLBACK for zone wait table Christoph Lameter
2007-09-19 3:36 ` [12/17] Virtual Compound page allocation from interrupt context Christoph Lameter
2007-09-19 3:36 ` [13/17] Virtual compound page freeing in " Christoph Lameter
2007-09-18 20:36 ` Nick Piggin
2007-09-20 17:50 ` Christoph Lameter
2007-09-19 3:36 ` [14/17] Allow bit_waitqueue to wait on a bit in a vmalloc area Christoph Lameter
2007-09-19 4:12 ` Gabriel C
2007-09-19 17:40 ` Christoph Lameter
2007-09-19 3:36 ` [15/17] SLUB: Support virtual fallback via SLAB_VFALLBACK Christoph Lameter
2007-09-27 21:42 ` Nick Piggin
2007-09-28 17:33 ` Christoph Lameter
2007-09-28 5:14 ` Nick Piggin
2007-10-01 20:50 ` Christoph Lameter
2007-10-02 8:43 ` Nick Piggin
2007-10-04 16:16 ` SLUB performance regression vs SLAB Matthew Wilcox
2007-10-04 17:38 ` Christoph Lameter [this message]
2007-10-04 17:50 ` Arjan van de Ven
2007-10-04 17:58 ` Christoph Lameter
2007-10-04 18:26 ` Peter Zijlstra
2007-10-04 20:48 ` David Miller
2007-10-04 20:58 ` Matthew Wilcox
2007-10-04 21:05 ` David Miller
2007-10-04 21:11 ` Christoph Lameter
2007-10-04 18:32 ` Matthew Wilcox
2007-10-04 17:49 ` Christoph Lameter
2007-10-04 19:28 ` Matthew Wilcox
2007-10-04 19:05 ` Christoph Lameter
2007-10-04 19:46 ` Siddha, Suresh B
2007-10-04 20:55 ` David Miller
2007-10-04 21:02 ` Chuck Ebbert
2007-10-04 21:11 ` David Miller
2007-10-04 21:47 ` Chuck Ebbert
2007-10-04 22:07 ` David Miller
2007-10-04 22:23 ` David Chinner
2007-10-05 6:48 ` Jens Axboe
2007-10-05 9:19 ` Pekka Enberg
2007-10-05 9:28 ` Jens Axboe
2007-10-05 11:12 ` Andi Kleen
2007-10-05 12:39 ` Jens Axboe
2007-10-05 19:31 ` Christoph Lameter
2007-10-05 19:32 ` Christoph Lameter
2007-10-05 11:56 ` Matthew Wilcox
2007-10-05 12:37 ` Jens Axboe
2007-10-05 19:27 ` Christoph Lameter
2007-10-05 20:32 ` Peter Zijlstra
2007-10-05 21:31 ` David Miller
2007-10-04 21:05 ` Matthew Wilcox
2007-10-05 2:43 ` Christoph Lameter
2007-10-05 2:53 ` Arjan van de Ven
2007-09-28 17:55 ` [15/17] SLUB: Support virtual fallback via SLAB_VFALLBACK Peter Zijlstra
2007-09-28 18:20 ` Christoph Lameter
2007-09-28 18:25 ` Peter Zijlstra
2007-09-28 18:41 ` Christoph Lameter
2007-09-28 20:22 ` Nick Piggin
2007-09-28 21:14 ` Mel Gorman
2007-09-28 20:59 ` Mel Gorman
2007-09-29 8:13 ` Andrew Morton
2007-09-29 8:47 ` Peter Zijlstra
2007-09-29 8:53 ` Peter Zijlstra
2007-09-29 9:01 ` Andrew Morton
2007-09-29 9:14 ` Peter Zijlstra
2007-09-29 9:27 ` Andrew Morton
2007-09-28 20:19 ` Nick Piggin
2007-09-29 19:20 ` Andrew Morton
2007-09-29 19:09 ` Nick Piggin
2007-09-30 20:12 ` Andrew Morton
2007-09-30 4:16 ` Nick Piggin
2007-09-29 9:00 ` Andrew Morton
2007-10-01 20:55 ` Christoph Lameter
2007-10-01 21:30 ` Andrew Morton
2007-10-01 21:38 ` Christoph Lameter
2007-10-01 21:45 ` Andrew Morton
2007-10-01 21:52 ` Christoph Lameter
2007-10-02 9:19 ` Peter Zijlstra
2007-09-29 8:45 ` Peter Zijlstra
2007-10-01 21:01 ` Christoph Lameter
2007-10-02 8:37 ` Nick Piggin
2007-09-28 21:05 ` Mel Gorman
2007-10-01 21:10 ` Christoph Lameter
2007-09-19 3:36 ` [16/17] Allow virtual fallback for buffer_heads Christoph Lameter
2007-09-19 3:36 ` [17/17] Allow virtual fallback for dentries Christoph Lameter
2007-09-19 7:34 ` [00/17] [RFC] Virtual Compound Page Support Anton Altaparmakov
2007-09-19 8:34 ` Eric Dumazet
2007-09-19 17:33 ` Christoph Lameter
2007-09-19 8:24 ` Andi Kleen
2007-09-19 17:36 ` Christoph Lameter
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