From: Rik van Riel <riel@redhat.com>
To: Mike Galbraith <bitbucket@online.de>
Cc: linux-kernel@vger.kernel.org, aquini@redhat.com,
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,
raghavendra.kt@linux.vnet.ibm.com, mingo@redhat.com
Subject: Re: [PATCH 0/5] x86,smp: make ticket spinlock proportional backoff w/ auto tuning
Date: Thu, 10 Jan 2013 10:31:13 -0500 [thread overview]
Message-ID: <50EEDEC1.9020708@redhat.com> (raw)
In-Reply-To: <1357831182.5841.21.camel@marge.simpson.net>
On 01/10/2013 10:19 AM, Mike Galbraith wrote:
> On Tue, 2013-01-08 at 17:26 -0500, Rik van Riel wrote:
>
>> Please let me know if you manage to break this code in any way,
>> so I can fix it...
>
> I didn't break it, but did let it play with rq->lock contention. Using
> cyclictest -Smp99 -i 100 -d 0, with 3 rt tasks for pull_rt_task() to
> pull around appears to have been a ~dead heat.
Good to hear that the code seems to be robust. It seems to
help prevent performance degradation in some workloads, and
nobody seems to have found regressions yet.
Thank you for testing.
next prev parent reply other threads:[~2013-01-10 15:31 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
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 [this message]
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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