From: Rik van Riel <riel@redhat.com>
To: Jan Beulich <jbeulich@suse.com>
Cc: eric.dumazet@gmail.com, rostedt@goodmis.org, therbert@google.com,
walken@google.com, jeremy@goop.org, tglx@linutronix.de,
aquini@redhat.com, lwoodman@redhat.com,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 3/3 -v2] x86,smp: auto tune spinlock backoff delay factor
Date: Thu, 27 Dec 2012 14:09:21 -0500 [thread overview]
Message-ID: <50DC9CE1.9030709@redhat.com> (raw)
In-Reply-To: <50DC9662020000780009210D@nat28.tlf.novell.com>
On 12/27/2012 01:41 PM, Jan Beulich wrote:
>>>> Rik van Riel <riel@redhat.com> 12/27/12 4:01 PM >>>
>> On 12/27/2012 09:27 AM, Eric Dumazet wrote:
>>> So the hash sounds good to me, because the hash key could mix both lock
>>> address and caller IP ( __builtin_return_address(1) in
>>> ticket_spin_lock_wait())
>>
>> The lock acquisition time depends on the holder of the lock,
>> and what the CPUs ahead of us in line will do with the lock,
>> not on the caller IP of the spinner.
>
> The lock holder could supply its __builtin_return_address(0) for use
> in eventual hashing.
>
> Also, with all of this - did you evaluate the alternative of using
> monitor/mwait instead?
How much bus traffic do monitor/mwait cause behind the scenes?
--
All rights reversed
next prev parent reply other threads:[~2012-12-27 19:09 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-21 23:49 [RFC PATCH 0/3] x86,smp: make ticket spinlock proportional backoff w/ auto tuning Rik van Riel
2012-12-21 23:50 ` [RFC PATCH 1/3] x86,smp: move waiting on contended lock out of line Rik van Riel
2012-12-22 3:05 ` Steven Rostedt
2012-12-22 4:40 ` Michel Lespinasse
2012-12-22 4:48 ` Rik van Riel
2012-12-23 22:52 ` Rafael Aquini
2012-12-21 23:51 ` [RFC PATCH 2/3] x86,smp: proportional backoff for ticket spinlocks Rik van Riel
2012-12-22 3:07 ` Steven Rostedt
2012-12-22 3:14 ` Steven Rostedt
2012-12-22 3:47 ` Rik van Riel
2012-12-22 4:44 ` Michel Lespinasse
2012-12-23 22:55 ` Rafael Aquini
2012-12-21 23:51 ` [RFC PATCH 3/3] x86,smp: auto tune spinlock backoff delay factor Rik van Riel
2012-12-21 23:56 ` [RFC PATCH 3/3 -v2] " Rik van Riel
2012-12-22 0:18 ` Eric Dumazet
2012-12-22 2:43 ` Rik van Riel
2012-12-22 0:48 ` Eric Dumazet
2012-12-22 2:57 ` Rik van Riel
2012-12-22 3:29 ` Eric Dumazet
2012-12-22 3:44 ` Rik van Riel
2012-12-22 3:33 ` Steven Rostedt
2012-12-22 3:50 ` Rik van Riel
2012-12-26 19:10 ` Eric Dumazet
2012-12-26 19:27 ` Eric Dumazet
2012-12-26 19:51 ` Rik van Riel
2012-12-27 6:07 ` Michel Lespinasse
2012-12-27 14:27 ` Eric Dumazet
2012-12-27 14:35 ` Rik van Riel
2012-12-27 18:41 ` Jan Beulich
2012-12-27 19:09 ` Rik van Riel [this message]
2013-01-03 9:05 ` Jan Beulich
2013-01-03 13:24 ` Steven Rostedt
2013-01-03 13:35 ` Eric Dumazet
2013-01-03 15:32 ` Steven Rostedt
2013-01-03 16:10 ` Eric Dumazet
2013-01-03 16:45 ` Steven Rostedt
2013-01-03 17:54 ` Eric Dumazet
2012-12-27 18:49 ` Eric Dumazet
2012-12-27 19:31 ` Rik van Riel
2012-12-29 0:42 ` Eric Dumazet
2012-12-29 10:27 ` Michel Lespinasse
2013-01-03 18:17 ` Eric Dumazet
2012-12-22 0:47 ` [RFC PATCH 3/3] " David Daney
2012-12-22 2:51 ` Rik van Riel
2012-12-22 3:49 ` Steven Rostedt
2012-12-22 3:58 ` Rik van Riel
2012-12-23 23:08 ` Rafael Aquini
2012-12-22 5:42 ` Michel Lespinasse
2012-12-22 14:32 ` Rik van Riel
2013-01-02 0:06 ` ticket spinlock proportional backoff experiments Michel Lespinasse
2013-01-02 0:09 ` [PATCH 1/2] x86,smp: simplify __ticket_spin_lock Michel Lespinasse
2013-01-02 15:31 ` Rik van Riel
2013-01-02 0:10 ` [PATCH 2/2] x86,smp: proportional backoff for ticket spinlocks Michel Lespinasse
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