From owner-cvs-src@FreeBSD.ORG  Mon Jul 23 22:24:03 2007
Return-Path: <owner-cvs-src@FreeBSD.ORG>
Delivered-To: cvs-src@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 78CB216A417;
	Mon, 23 Jul 2007 22:24:03 +0000 (UTC)
	(envelope-from jroberson@chesapeake.net)
Received: from webaccess-cl.virtdom.com (webaccess-cl.virtdom.com
	[216.240.101.25])
	by mx1.freebsd.org (Postfix) with ESMTP id 4A93213C45B;
	Mon, 23 Jul 2007 22:24:03 +0000 (UTC)
	(envelope-from jroberson@chesapeake.net)
Received: from [192.168.1.101] (c-71-231-138-78.hsd1.or.comcast.net
	[71.231.138.78]) (authenticated bits=0)
	by webaccess-cl.virtdom.com (8.13.6/8.13.6) with ESMTP id
	l6NMO1I1092982
	(version=TLSv1/SSLv3 cipher=DHE-DSS-AES256-SHA bits=256 verify=NO);
	Mon, 23 Jul 2007 18:24:02 -0400 (EDT)
	(envelope-from jroberson@chesapeake.net)
Date: Mon, 23 Jul 2007 15:27:02 -0700 (PDT)
From: Jeff Roberson <jroberson@chesapeake.net>
X-X-Sender: jroberson@10.0.0.1
To: Attilio Rao <attilio@FreeBSD.org>
In-Reply-To: <3bbf2fe10707231359ge18ef19s1db60160ee497bfa@mail.gmail.com>
Message-ID: <20070723152622.U561@10.0.0.1>
References: <200707032126.l63LQ7ea027929@repoman.freebsd.org> 
	<20070703142714.F552@10.0.0.1>
	<20070723201642.GC96643@obiwan.tataz.chchile.org>
	<3bbf2fe10707231359ge18ef19s1db60160ee497bfa@mail.gmail.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org,
	Jeremie Le Hen <jeremie@le-hen.org>, cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/kern kern_descrip.c
X-BeenThere: cvs-src@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: CVS commit messages for the src tree <cvs-src.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src>
List-Post: <mailto:cvs-src@freebsd.org>
List-Help: <mailto:cvs-src-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 23 Jul 2007 22:24:03 -0000


On Mon, 23 Jul 2007, Attilio Rao wrote:

> 2007/7/23, Jeremie Le Hen <jeremie@le-hen.org>:
>> Hi Jeff,
>> 
>> On Tue, Jul 03, 2007 at 02:27:51PM -0700, Jeff Roberson wrote:
>> >  For the curious, these last two patches make a substantial improvement 
>> to
>> >  mysql write performance on my 8way opteron:
>> >
>> >  http://people.freebsd.org/~jeff/mysqlwrite.png
>> >
>> >  The green line is without and the blue line is with.
>> 
>> Just for information, do you have any hint why Linux eventually
>> performs better above 18 threads?
>
> IIRC, this workload is lockmgr() dominated now, which is particulary
> unlucky for us since they are very heavy.

Attilio should also mention that he is fixing this problem as his SoC 
project.  I expect to see good gains once this is complete.

Thanks,
Jeff

>
> Attilio
>
>
> -- 
> Peace can only be achieved by understanding - A. Einstein
>