From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
Arjan van de Ven <arjan@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: sched_yield: delete sysctl_sched_compat_yield
Date: Tue, 04 Dec 2007 14:40:13 +0800 [thread overview]
Message-ID: <1196750413.25646.182.camel@ymzhang> (raw)
In-Reply-To: <20071203100554.GA30050@elte.hu>
On Mon, 2007-12-03 at 11:05 +0100, Ingo Molnar wrote:
> * Zhang, Yanmin <yanmin_zhang@linux.intel.com> wrote:
>
> > Although no source codes of volanoMark, I suspect it calls
> > Thread.sched. volanoMark is a kind of chatroom benchmark. When a
> > client sends out a message, server will send the message to all
> > clients. I suspect the client calls Thread.yield after sending out a
> > couple of messages.
>
> yeah, so far only volanomark seems to be affected by this, and if it
> indeed calls Thread.yield artificially it's a pretty stupid benchmark
> and it's not the fault of the JDK. If we had the source to volanomark we
> could fix this easily.
>
> > 2 JVM all have regression if sched_compat_yield=0.
> >
> > I ran some testing, such like iozone/specjbb/tbench/dbench/sysbench,
> > and didn't see regression.
>
> which JVM was utilized by the specjbb (Java Business Benchmark) tests?
BEA Jrockit. It supports huge pages which promote performance for about 8%~10%.
-yanmin
prev parent reply other threads:[~2007-12-04 6:41 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-27 9:33 sched_yield: delete sysctl_sched_compat_yield Zhang, Yanmin
2007-11-27 11:17 ` Ingo Molnar
2007-11-27 22:57 ` Arjan van de Ven
2007-11-30 2:46 ` Nick Piggin
2007-11-30 2:51 ` Arjan van de Ven
2007-11-30 3:02 ` Nick Piggin
2007-11-30 3:15 ` Zhang, Yanmin
2007-11-30 3:29 ` Nick Piggin
2007-11-30 4:32 ` Zhang, Yanmin
2007-11-30 10:08 ` Ingo Molnar
2007-12-03 4:27 ` Nick Piggin
2007-12-03 8:45 ` Ingo Molnar
2007-12-03 9:17 ` Nick Piggin
2007-12-03 9:35 ` Zhang, Yanmin
2007-12-03 9:57 ` Ingo Molnar
2007-12-03 10:15 ` Nick Piggin
2007-12-03 10:33 ` Ingo Molnar
2007-12-03 11:02 ` Nick Piggin
2007-12-03 11:37 ` Ingo Molnar
2007-12-03 17:04 ` David Schwartz
2007-12-03 17:37 ` Chris Friesen
2007-12-03 19:12 ` David Schwartz
2007-12-03 19:56 ` Chris Friesen
2007-12-03 21:39 ` Mark Lord
2007-12-03 21:48 ` Ingo Molnar
2007-12-03 21:57 ` Mark Lord
2007-12-03 22:05 ` Ingo Molnar
2007-12-03 22:18 ` Mark Lord
2007-12-03 22:33 ` Ingo Molnar
2007-12-04 0:18 ` Nick Piggin
2007-12-04 0:30 ` David Schwartz
2007-12-04 2:09 ` Nick Piggin
2007-12-04 1:02 ` Nick Piggin
2007-12-03 9:41 ` Zhang, Yanmin
2007-12-03 10:17 ` Ingo Molnar
2007-12-03 9:29 ` Zhang, Yanmin
2007-12-03 10:05 ` Ingo Molnar
2007-12-04 6:40 ` Zhang, Yanmin [this message]
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=1196750413.25646.182.camel@ymzhang \
--to=yanmin_zhang@linux.intel.com \
--cc=akpm@linux-foundation.org \
--cc=arjan@infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=nickpiggin@yahoo.com.au \
/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).