From owner-cvs-all@FreeBSD.ORG  Tue Oct 30 13:18:22 2007
Return-Path: <owner-cvs-all@FreeBSD.ORG>
Delivered-To: cvs-all@hub.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id F418116A418;
	Tue, 30 Oct 2007 13:18:21 +0000 (UTC)
	(envelope-from davidxu@FreeBSD.org)
Received: from freefall.freebsd.org (freefall.freebsd.org
	[IPv6:2001:4f8:fff6::28])
	by mx1.freebsd.org (Postfix) with ESMTP id DEA9F13C4B2;
	Tue, 30 Oct 2007 13:18:21 +0000 (UTC)
	(envelope-from davidxu@FreeBSD.org)
Received: from alona.my.domain (root@localhost [127.0.0.1])
	by freefall.freebsd.org (8.14.1/8.14.1) with ESMTP id l9UDIE2Q081933;
	Tue, 30 Oct 2007 13:18:18 GMT (envelope-from davidxu@freebsd.org)
Message-ID: <47272F1E.7070900@freebsd.org>
Date: Tue, 30 Oct 2007 21:18:22 +0800
From: David Xu <davidxu@FreeBSD.org>
User-Agent: Thunderbird 2.0.0.0 (X11/20070613)
MIME-Version: 1.0
To: Kris Kennaway <kris@FreeBSD.org>
References: <200710292101.l9TL1mAE049561@repoman.freebsd.org>
	<47268F17.1000106@freebsd.org>
	<Pine.GSO.4.64.0710292207140.19572@sea.ntplx.net>
	<47269AD0.3080906@freebsd.org> <4726EEFB.8030309@FreeBSD.org>
	<4726F3C7.2060506@freebsd.org> <472701C9.4020208@FreeBSD.org>
In-Reply-To: <472701C9.4020208@FreeBSD.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: Daniel Eischen <deischen@FreeBSD.org>, David Xu <davidxu@FreeBSD.org>,
	cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/lib/libthr/thread thr_mutex.c
 src/lib/libkse/thread thr_mutex.c src/include pthread.h
X-BeenThere: cvs-all@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: CVS commit messages for the entire tree <cvs-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-all>,
	<mailto:cvs-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-all>
List-Post: <mailto:cvs-all@freebsd.org>
List-Help: <mailto:cvs-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-all>,
	<mailto:cvs-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 30 Oct 2007 13:18:22 -0000

Kris Kennaway wrote:
> David Xu wrote:
>> My last commit improves mysql select-smack benchmark on 4-core xeon from
>> 48000 queries/s to 70000 queries/s, so my work is alternative way
> 
> No, that is an orthogonal issue that (after measurement) does not solve 
> the same problem that is addressed by this change.  I'd be happy to 
> discuss it with you in more detail if you are interested.  We could also 
> discuss the fact that super-smack is a questionable target to be 
> optimizing because the main performance problems seem to be from a very 
> poor benchmark design.
> 
> I claim that real-world applications do not commonly do I/O in units of 
> 1 byte :)
> 


I'd rather to believe it is scheduling problem, spin loops does not 
help, but sched_yield() loops does help it a lot.