From: Rafael Aquini <aquini@redhat.com>
To: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: Rik van Riel <riel@redhat.com>,
linux-kernel@vger.kernel.org, walken@google.com,
eric.dumazet@gmail.com, lwoodman@redhat.com, jeremy@goop.org,
Jan Beulich <JBeulich@novell.com>,
knoel@redhat.com, chegu_vinod@hp.com, mingo@redhat.com
Subject: Re: [PATCH 0/5] x86,smp: make ticket spinlock proportional backoff w/ auto tuning
Date: Thu, 10 Jan 2013 00:27:23 -0200 [thread overview]
Message-ID: <20130110022722.GA1636@x61.redhat.com> (raw)
In-Reply-To: <50ED679B.9020306@linux.vnet.ibm.com>
On Wed, Jan 09, 2013 at 06:20:35PM +0530, Raghavendra K T wrote:
> I ran kernbench on 32 core (mx3850) machine with 3.8-rc2 base.
> x base_3.8rc2
> + rik_backoff
> N Min Max Median Avg Stddev
> x 8 222.977 231.16 227.735 227.388 3.1512986
> + 8 218.75 232.347 229.1035 228.25425 4.2730225
> No difference proven at 95.0% confidence
I got similar results on smaller systems (1 socket, dual-cores and quad-cores)
when running Rik's latest series, no big difference for good nor for worse,
but I also think Rik's work is meant to address bigger systems with more cores
contending for any given spinlock.
next prev parent reply other threads:[~2013-01-10 2:27 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-08 22:26 [PATCH 0/5] x86,smp: make ticket spinlock proportional backoff w/ auto tuning Rik van Riel
2013-01-08 22:30 ` [PATCH 3/5] x86,smp: auto tune spinlock backoff delay factor Rik van Riel
2013-01-10 3:13 ` Rafael Aquini
2013-01-10 12:49 ` Michel Lespinasse
2013-01-08 22:31 ` [PATCH 4/5] x86,smp: keep spinlock delay values per hashed spinlock address Rik van Riel
2013-01-10 3:14 ` Rafael Aquini
2013-01-10 13:01 ` Michel Lespinasse
2013-01-10 13:05 ` Rik van Riel
2013-01-10 13:15 ` Michel Lespinasse
2013-01-08 22:32 ` [DEBUG PATCH 5/5] x86,smp: add debugging code to track spinlock delay value Rik van Riel
2013-01-08 22:32 ` [PATCH 2/5] x86,smp: proportional backoff for ticket spinlocks Rik van Riel
2013-01-08 22:50 ` Eric Dumazet
2013-01-08 22:54 ` Rik van Riel
2013-01-10 2:30 ` Rafael Aquini
2013-01-08 22:32 ` [PATCH 1/5] x86,smp: move waiting on contended ticket lock out of line Rik van Riel
2013-01-08 22:43 ` Eric Dumazet
2013-01-10 17:38 ` Raghavendra K T
2013-01-09 12:50 ` [PATCH 0/5] x86,smp: make ticket spinlock proportional backoff w/ auto tuning Raghavendra K T
2013-01-10 2:27 ` Rafael Aquini [this message]
2013-01-10 17:36 ` Raghavendra K T
2013-01-11 20:11 ` Rik van Riel
2013-01-13 18:07 ` Raghavendra K T
2013-01-10 15:19 ` Mike Galbraith
2013-01-10 15:31 ` Rik van Riel
2013-01-10 19:30 ` Mike Galbraith
2013-01-24 13:28 ` Ingo Molnar
2013-01-10 22:24 ` Chegu Vinod
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