From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Mel Gorman <mgorman@suse.de>,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
akpm@linux-foundation.org, mjg59@srcf.ucam.org,
paulmck@linux.vnet.ibm.com, maxime.coquelin@stericsson.com,
loic.pallardy@stericsson.com, arjan@linux.intel.com,
kmpark@infradead.org, kamezawa.hiroyu@jp.fujitsu.com,
lenb@kernel.org, rjw@sisk.pl, gargankita@gmail.com,
amit.kachhap@linaro.org, thomas.abraham@linaro.org,
santosh.shilimkar@ti.com, linux-pm@vger.kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 0/8][Sorted-buddy] mm: Linux VM Infrastructure to support Memory Power Management
Date: Fri, 09 Nov 2012 22:04:16 +0530 [thread overview]
Message-ID: <509D3088.2060507@linux.vnet.ibm.com> (raw)
In-Reply-To: <509D2B9B.4090305@linux.vnet.ibm.com>
On 11/09/2012 09:43 PM, Dave Hansen wrote:
> On 11/09/2012 07:23 AM, Srivatsa S. Bhat wrote:
>> FWIW, kernbench is actually (and surprisingly) showing a slight performance
>> *improvement* with this patchset, over vanilla 3.7-rc3, as I mentioned in
>> my other email to Dave.
>>
>> https://lkml.org/lkml/2012/11/7/428
>>
>> I don't think I can dismiss it as an experimental error, because I am seeing
>> those results consistently.. I'm trying to find out what's behind that.
>
> The only numbers in that link are in the date. :) Let's see the
> numbers, please.
>
Sure :) The reason I didn't post the numbers very eagerly was that I didn't
want it to look ridiculous if it later turned out to be really an error in the
experiment ;) But since I have seen it happening consistently I think I can
post the numbers here with some non-zero confidence.
> If you really have performance improvement to the memory allocator (or
> something else) here, then surely it can be pared out of your patches
> and merged quickly by itself. Those kinds of optimizations are hard to
> come by!
>
:-)
Anyway, here it goes:
Test setup:
----------
x86 2-socket quad-core machine. (CONFIG_NUMA=n because I figured that my
patchset might not handle NUMA properly). Mem region size = 512 MB.
Kernbench log for Vanilla 3.7-rc3
=================================
Kernel: 3.7.0-rc3-vanilla-default
Average Optimal load -j 32 Run (std deviation):
Elapsed Time 650.742 (2.49774)
User Time 8213.08 (17.6347)
System Time 1273.91 (6.00643)
Percent CPU 1457.4 (3.64692)
Context Switches 2250203 (3846.61)
Sleeps 1.8781e+06 (5310.33)
Kernbench log for this sorted-buddy patchset
============================================
Kernel: 3.7.0-rc3-sorted-buddy-default
Average Optimal load -j 32 Run (std deviation):
Elapsed Time 591.696 (0.660969)
User Time 7511.97 (1.08313)
System Time 1062.99 (1.1109)
Percent CPU 1448.6 (1.94936)
Context Switches 2.1496e+06 (3507.12)
Sleeps 1.84305e+06 (3092.67)
Regards,
Srivatsa S. Bhat
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next prev parent reply other threads:[~2012-11-09 16:35 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-06 19:52 [RFC PATCH 0/8][Sorted-buddy] mm: Linux VM Infrastructure to support Memory Power Management Srivatsa S. Bhat
2012-11-06 19:52 ` [RFC PATCH 1/8] mm: Introduce memory regions data-structure to capture region boundaries within node Srivatsa S. Bhat
2012-11-06 23:03 ` Dave Hansen
2012-11-07 20:12 ` Srivatsa S. Bhat
2012-11-06 19:52 ` [RFC PATCH 2/8] mm: Initialize node memory regions during boot Srivatsa S. Bhat
2012-12-04 8:25 ` wujianguo
2012-11-06 19:53 ` [RFC PATCH 3/8] mm: Introduce and initialize zone memory regions Srivatsa S. Bhat
2012-11-06 19:53 ` [RFC PATCH 4/8] mm: Add helpers to retrieve node region and zone region for a given page Srivatsa S. Bhat
2012-11-16 18:39 ` [RFC PATCH UPDATED " Srivatsa S. Bhat
2012-11-06 19:53 ` [RFC PATCH 5/8] mm: Add data-structures to describe memory regions within the zones' freelists Srivatsa S. Bhat
2012-11-06 19:53 ` [RFC PATCH 6/8] mm: Demarcate and maintain pageblocks in region-order in " Srivatsa S. Bhat
2012-11-06 21:49 ` Dave Hansen
2012-11-07 20:15 ` Srivatsa S. Bhat
2012-11-09 6:22 ` Ankita Garg
2012-11-09 6:01 ` Ankita Garg
2012-11-09 9:03 ` Srivatsa S. Bhat
2012-11-06 19:54 ` [RFC PATCH 7/8] mm: Add an optimized version of del_from_freelist to keep page allocation fast Srivatsa S. Bhat
2012-11-06 19:54 ` [RFC PATCH 8/8] mm: Print memory region statistics to understand the buddy allocator behavior Srivatsa S. Bhat
2012-11-08 18:02 ` [RFC PATCH 0/8][Sorted-buddy] mm: Linux VM Infrastructure to support Memory Power Management Mel Gorman
2012-11-08 19:38 ` Srivatsa S. Bhat
2012-11-09 5:14 ` Vaidyanathan Srinivasan
2012-11-09 9:00 ` Mel Gorman
2012-11-09 14:51 ` Srivatsa S. Bhat
2012-11-09 15:23 ` Srivatsa S. Bhat
2012-11-09 16:13 ` Dave Hansen
2012-11-09 16:34 ` Srivatsa S. Bhat [this message]
2012-11-09 16:43 ` Srivatsa S. Bhat
2012-11-09 16:52 ` Srivatsa S. Bhat
2012-11-16 18:32 ` Srivatsa S. Bhat
2012-11-09 15:34 ` Arjan van de Ven
[not found] ` <loom.20121109T172910-394@post.gmane.org>
2012-11-12 16:14 ` Srivatsa S. Bhat
2012-12-04 10:51 ` wujianguo
2012-12-06 6:32 ` Srivatsa S. Bhat
-- strict thread matches above, loose matches on Subject: below --
2012-11-09 18:14 Srinivas Pandruvada
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