From: Dave Hansen <dave.hansen@intel.com>
To: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux-MM <linux-mm@kvack.org>, Rik van Riel <riel@redhat.com>,
Kevin Hilman <khilman@linaro.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Paul Bolle <paul.bollee@gmail.com>,
Zlatko Calusic <zcalusic@bitsync.net>,
Andrew Morton <akpm@linux-foundation.org>,
Tim Chen <tim.c.chen@linux.intel.com>,
Andi Kleen <ak@linux.intel.com>, Vlastimil Babka <vbabka@suse.cz>
Subject: Re: NUMA? bisected performance regression 3.11->3.12
Date: Fri, 06 Dec 2013 09:43:05 -0800 [thread overview]
Message-ID: <52A20CA9.2040303@intel.com> (raw)
In-Reply-To: <20131126103223.GG5285@suse.de>
On 11/26/2013 02:32 AM, Mel Gorman wrote:
> On Thu, Nov 21, 2013 at 02:57:18PM -0800, Dave Hansen wrote:
>> I'm running an open/close microbenchmark from the will-it-scale set:
>>> https://github.com/antonblanchard/will-it-scale/blob/master/tests/open1.c
>>
>> I was seeing some weird symptoms on 3.12 vs 3.11. The throughput in
>> that test was going from down from 50 million to 35 million.
>>
>> The profiles show an increase in cpu time in _raw_spin_lock_irq. The
>> profiles pointed to slub code that hasn't been touched in quite a while.
>> I bisected it down to:
>
> Dave, do you mind retesting this against "[RFC PATCH 0/5] Memory compaction
> efficiency improvements" please? I have not finished reviewing the series
> yet but patch 3 mentions lower allocation success rates with Johannes'
> patch and notes that it is unlikely to be a bug with the patch itself.
Sorry for the delay. I lost monster box for a few days...
That series didn't look to have much of an effect. Before/after numbers
coming out of that open1 test were both ~35M. If it helped, it was in
the noise.
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prev parent reply other threads:[~2013-12-06 17:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-21 22:57 NUMA? bisected performance regression 3.11->3.12 Dave Hansen
2013-11-22 5:22 ` Johannes Weiner
2013-11-22 6:18 ` Dave Hansen
2013-11-22 6:38 ` Johannes Weiner
2013-11-22 16:57 ` Dave Hansen
2013-11-26 10:32 ` Mel Gorman
2013-12-06 17:43 ` Dave Hansen [this message]
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