From: Waiman Long <waiman.long@hp.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Arnd Bergmann <arnd@arndb.de>,
linux-arch@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org,
Steven Rostedt <rostedt@goodmis.org>,
Andrew Morton <akpm@linux-foundation.org>,
Michel Lespinasse <walken@google.com>,
Andi Kleen <andi@firstfloor.org>, Rik van Riel <riel@redhat.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
George Spelvin <linux@horizon.com>,
Tim Chen <tim.c.chen@linux.intel.com>,
Daniel J Blueman <daniel@numascale.com>,
Alexander Fyodorov <halcy@yandex.ru>,
Aswin Chandramouleeswaran <aswin@hp.com>,
Scott J Norton <scott.norton@hp.com>,
Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@hp.com>
Subject: Re: [PATCH v3 1/2] qspinlock: Introducing a 4-byte queue spinlock implementation
Date: Wed, 05 Feb 2014 22:10:34 -0500 [thread overview]
Message-ID: <52F2FD2A.1020704@hp.com> (raw)
In-Reply-To: <20140203114054.GH8874@twins.programming.kicks-ass.net>
On 02/03/2014 06:40 AM, Peter Zijlstra wrote:
> On Fri, Jan 31, 2014 at 02:24:33PM -0500, Waiman Long wrote:
>> Light contention is the only case where the qspinlock may not perform as
>> good as the ticket spinlock. I know this is the most common case. However, I
>> would argue that the slowdown, if any, will not be really noticeable. This
>> is what I will try to find out.
> Please also explain why things are slower/faster. Thomas tried to get
> you to do so a few months back, but you kept deflecting.
It is not easy to have a test case to test light contention. I am trying
to create custom test case to get that data.
-Longman
next prev parent reply other threads:[~2014-02-06 3:11 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-28 18:19 [PATCH v3 0/2] qspinlock: Introducing a 4-byte queue spinlock Waiman Long
2014-01-28 18:19 ` [PATCH v3 1/2] qspinlock: Introducing a 4-byte queue spinlock implementation Waiman Long
2014-01-29 0:20 ` Andi Kleen
2014-01-29 2:57 ` George Spelvin
2014-01-29 17:57 ` Waiman Long
2014-01-30 17:43 ` Rik van Riel
2014-01-30 19:00 ` Tim Chen
2014-01-30 19:28 ` Peter Zijlstra
2014-01-30 22:27 ` Tim Chen
2014-01-31 18:26 ` Waiman Long
2014-01-31 19:14 ` George Spelvin
2014-01-31 19:28 ` Waiman Long
2014-01-31 19:45 ` Peter Zijlstra
2014-01-31 18:16 ` Waiman Long
2014-01-30 19:35 ` Peter Zijlstra
2014-01-31 18:28 ` Waiman Long
2014-01-31 15:08 ` Peter Zijlstra
2014-01-31 19:24 ` Waiman Long
2014-01-31 19:51 ` Peter Zijlstra
2014-02-03 11:40 ` Peter Zijlstra
2014-02-06 3:10 ` Waiman Long [this message]
2014-02-07 18:17 ` Paul E. McKenney
2014-02-03 8:51 ` Raghavendra K T
2014-01-28 18:19 ` [PATCH v3 2/2] qspinlock, x86: Enable x86-64 to use queue spinlock Waiman Long
2014-01-30 17:45 ` Rik van Riel
2014-01-30 8:55 ` [PATCH v3 0/2] qspinlock: Introducing a 4-byte " Raghavendra K T
2014-01-30 15:38 ` Waiman Long
2014-01-30 18:49 ` Raghavendra K T
2014-02-03 8:51 ` Raghavendra K T
2014-02-06 3:09 ` Waiman Long
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=52F2FD2A.1020704@hp.com \
--to=waiman.long@hp.com \
--cc=akpm@linux-foundation.org \
--cc=andi@firstfloor.org \
--cc=arnd@arndb.de \
--cc=aswin@hp.com \
--cc=daniel@numascale.com \
--cc=halcy@yandex.ru \
--cc=hpa@zytor.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@horizon.com \
--cc=mingo@redhat.com \
--cc=paulmck@linux.vnet.ibm.com \
--cc=peterz@infradead.org \
--cc=raghavendra.kt@linux.vnet.ibm.com \
--cc=riel@redhat.com \
--cc=rostedt@goodmis.org \
--cc=scott.norton@hp.com \
--cc=tglx@linutronix.de \
--cc=thavatchai.makpahibulchoke@hp.com \
--cc=tim.c.chen@linux.intel.com \
--cc=torvalds@linux-foundation.org \
--cc=walken@google.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).