From: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>,
Jiannan Ouyang <ouyang@cs.pitt.edu>,
LKML <linux-kernel@vger.kernel.org>,
Avi Kivity <avi.kivity@gmail.com>, Gleb Natapov <gleb@redhat.com>,
Ingo Molnar <mingo@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Srikar <srikar@linux.vnet.ibm.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Nikunj A. Dadhania" <nikunj@linux.vnet.ibm.com>,
KVM <kvm@vger.kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
Chegu Vinod <chegu_vinod@hp.com>,
"Andrew M. Theurer" <habanero@linux.vnet.ibm.com>,
Srivatsa Vaddagiri <srivatsa.vaddagiri@gmail.com>,
Andrew Jones <drjones@redhat.com>, Karen Noel <knoel@redhat.com>
Subject: Re: Preemptable Ticket Spinlock
Date: Tue, 23 Apr 2013 10:33:00 +0530 [thread overview]
Message-ID: <51761604.6080103@linux.vnet.ibm.com> (raw)
In-Reply-To: <1366664518.8337.21.camel@laptop>
On 04/23/2013 02:31 AM, Peter Zijlstra wrote:
> On Mon, 2013-04-22 at 16:49 -0400, Rik van Riel wrote:
>> Given the fairly high cost of rescheduling a VCPU (which is likely
>> to include an IPI), versus the short hold time of most spinlocks,
>> I have the strong suspicion that your approach would win.
>
> https://lkml.org/lkml/2012/5/2/101
>
> If you schedule too often your SPIN_THRESHOLD is far too low.
>
> Anyway.. performance can't be that bad, otherwise Jeremey would have
> spend as much time on it as he did.
When I experimented last time ideal SPIN_THRESHOLD for PLE machine,
was around 4k, 8k. Jeremy's experiment was on a non-PLE machine AFAIK,
which complemented PLE feature in a nice way with 2k threshold.
next prev parent reply other threads:[~2013-04-23 5:03 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAJocwccu5QQyuKRvgNyPSFz2K_rzCW419W9-XdSUYOL7+KqQKg@mail.gmail.com>
2013-04-21 21:12 ` Preemptable Ticket Spinlock Rik van Riel
2013-04-21 23:07 ` Jiannan Ouyang
2013-04-22 5:59 ` Raghavendra K T
2013-04-22 11:51 ` Peter Zijlstra
2013-04-22 12:52 ` Rik van Riel
2013-04-22 19:49 ` Peter Zijlstra
2013-04-22 19:56 ` Rik van Riel
2013-04-22 20:05 ` Jiannan Ouyang
2013-04-22 20:08 ` Peter Zijlstra
2013-04-22 20:32 ` Rik van Riel
2013-04-22 20:44 ` Peter Zijlstra
2013-04-22 20:48 ` Peter Zijlstra
2013-04-22 20:50 ` Rik van Riel
2013-04-22 20:50 ` Jiannan Ouyang
2013-04-22 20:54 ` Chegu Vinod
2013-04-22 20:46 ` Jiannan Ouyang
2013-04-22 20:49 ` Rik van Riel
2013-04-22 21:01 ` Peter Zijlstra
2013-04-23 5:03 ` Raghavendra K T [this message]
2013-04-22 20:55 ` Peter Zijlstra
2013-04-22 21:31 ` Jiannan Ouyang
2013-04-22 23:08 ` Rik van Riel
2013-04-23 5:57 ` Gleb Natapov
2013-04-23 1:42 ` Raghavendra K T
2013-05-30 11:56 ` Raghavendra K T
2013-05-30 20:14 ` Thomas Gleixner
2013-04-22 21:56 ` Andi Kleen
2013-04-22 23:13 ` Rik van Riel
2013-04-22 5:58 ` Raghavendra K T
2013-04-22 16:42 ` Jiannan Ouyang
2013-04-23 1:54 ` Raghavendra K T
2013-04-26 20:10 ` Andrew Theurer
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=51761604.6080103@linux.vnet.ibm.com \
--to=raghavendra.kt@linux.vnet.ibm.com \
--cc=avi.kivity@gmail.com \
--cc=chegu_vinod@hp.com \
--cc=drjones@redhat.com \
--cc=gleb@redhat.com \
--cc=habanero@linux.vnet.ibm.com \
--cc=hpa@zytor.com \
--cc=knoel@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=mtosatti@redhat.com \
--cc=nikunj@linux.vnet.ibm.com \
--cc=ouyang@cs.pitt.edu \
--cc=peterz@infradead.org \
--cc=riel@redhat.com \
--cc=srikar@linux.vnet.ibm.com \
--cc=srivatsa.vaddagiri@gmail.com \
--cc=tglx@linutronix.de \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.