From owner-freebsd-current@FreeBSD.ORG  Fri Sep 19 16:09:22 2008
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id B6E4E1065675;
	Fri, 19 Sep 2008 16:09:22 +0000 (UTC) (envelope-from lev@FreeBSD.org)
Received: from ftp.translate.ru (ftp.translate.ru [195.131.4.140])
	by mx1.freebsd.org (Postfix) with ESMTP id 69FC48FC1F;
	Fri, 19 Sep 2008 16:09:22 +0000 (UTC) (envelope-from lev@FreeBSD.org)
Received: from desktop.home.serebryakov.spb.ru (unknown [89.163.10.141])
	(Authenticated sender: lev@serebryakov.spb.ru)
	by ftp.translate.ru (Postfix) with ESMTPA id D7E8213DF8E;
	Fri, 19 Sep 2008 19:50:02 +0400 (MSD)
Date: Fri, 19 Sep 2008 19:50:03 +0400
From: Lev Serebryakov <lev@FreeBSD.org>
X-Mailer: The Bat! (v3.99.3) Professional
Organization: FreeBSD
X-Priority: 3 (Normal)
Message-ID: <1161333663.20080919195003@serebryakov.spb.ru>
To: Peter Grehan <grehan@freebsd.org>
In-Reply-To: <48D3BBFD.4040403@freebsd.org>
References: <20080919120017.1D44810656A3@hub.freebsd.org>
	<48D3BBFD.4040403@freebsd.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: freebsd-current@freebsd.org, Julian Elischer <julian@elischer.org>
Subject: Re[2]: amd opteron NUMA support
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: lev@FreeBSD.org
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 19 Sep 2008 16:09:22 -0000

Hello, Peter.
You wrote 19 ???????? 2008 ?., 18:49:33:

>> Is anyone looking at trying to add specific support for the
>> hyper-transport based numa AMD systems?
>   You don't have to do anything. The penalty for remote access is hidden
> with caching. It's only hugely large working sets that would show the 
> difference, and for those, the memory is probably set up interleaved to
> average out the worst-case behaviour.
  It is not perfectly true. New Java versions have NUMA-aware memory
allocator, which interacts with OS (Solaris is best an linux is much
worse in providin adequate NUMA configuration information to userland)
and this gives about +15% on 4-socket Opteron system and +200% on
SunFire 15K with 72 sockets (of UltraSPARC, so SunFire expirience is
not too releveant for FreeBSD) on typical benchmarks.

-- 
// Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>