From owner-freebsd-stable@FreeBSD.ORG Tue Dec 4 10:54:08 2007 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 60A1E16A41A for ; Tue, 4 Dec 2007 10:54:08 +0000 (UTC) (envelope-from krassi@bulinfo.net) Received: from mx.bulinfo.net (mx.bulinfo.net [193.194.156.1]) by mx1.freebsd.org (Postfix) with ESMTP id 0F4CB13C4CE for ; Tue, 4 Dec 2007 10:54:07 +0000 (UTC) (envelope-from krassi@bulinfo.net) Received: from localhost (localhost [127.0.0.1]) by mx.bulinfo.net (Postfix) with ESMTP id 561F313A2F; Tue, 4 Dec 2007 12:54:06 +0200 (EET) Received: from mx.bulinfo.net ([127.0.0.1]) by localhost (mx.bulinfo.net [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 94413-01-2; Tue, 4 Dec 2007 12:54:04 +0200 (EET) Received: from [192.168.2.188] (pythia.bulinfo.net [212.72.195.5]) by mx.bulinfo.net (Postfix) with ESMTP id 5842613A8B; Tue, 4 Dec 2007 12:52:34 +0200 (EET) Message-ID: <47553170.90409@bulinfo.net> Date: Tue, 04 Dec 2007 12:52:32 +0200 From: Krassimir Slavchev User-Agent: Thunderbird 2.0.0.9 (X11/20071122) MIME-Version: 1.0 To: Alexey Popov References: <20071201213732.GA16638@cannabis.dataforce.net> <1497741406.20071201230441@rulez.sk> <20071202174540.GA29572@cannabis.dataforce.net> <200712020844.49718.linimon@FreeBSD.org> <4753C9E4.1060200@chistydom.ru> <20071203114037.G79674@fledge.watson.org> <47542372.3040303@chistydom.ru> <20071203163353.J79674@fledge.watson.org> <47551C1C.3000903@chistydom.ru> In-Reply-To: <47551C1C.3000903@chistydom.ru> X-Enigmail-Version: 0.95.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Virus-Scanned: amavisd-new at mx.bulinfo.net Cc: freebsd-stable@freebsd.org, Robert Watson Subject: Re: 2 x quad-core system is slower that 2 x dual core on FreeBSD X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Dec 2007 10:54:08 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Alexey Popov wrote: > Hi > > Robert Watson wrote: >> Evidence in-hand seems to suggest that 8 core systems work very well >> for most users, and reflect a significant performance increase with >> 7.0 over previous FreeBSD releases. > I disagree with that. Heavily loaded Apache, MySQL, Postgres does not > work well. There is another report for such problems: http://blog.insidesystems.net/articles/2007/04/09/what-did-i-do-wrong > >>>> The right path forwawrd at this point is to diagnosis the problems >>>> and work on fixing them in 8-CURRENT, and assuming they are not >>>> highly disruptive, MFC them for FreeBSD 7.1. >>> >>> I believe at least the bug with lockmgr contention should be fixed >>> before release. >> Could you point me at the specific proposed change in question? I >> don't think I've seen it come across re@ as a potential merge >> request. Changing locking primitives close to a release is, FYI, a >> risky business, as while it may improve performance in specific cases, >> we may not have a lot of information about more general cases. We >> also risk opening up previously nascent race conditions in lock >> consumers. > Kris sent me proof of concept patch that helped much against high > lockmgr contention. After applying this patch 8-core server become > faster that 4-core. But, again, it's still slower than Linux. > > Here's the patch: > http://lists.freebsd.org/pipermail/freebsd-stable/2007-November/038449.html > > Here's Kris saying that it helps: > http://lists.freebsd.org/pipermail/freebsd-stable/2007-November/038672.html > > I'm not sure it will help to MySQL and Prostgres, but symptoms are > mostly identical. > > With best regards, > Alexey Popov > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFHVTFwxJBWvpalMpkRAjX0AJ4otHVzAzVqVRKJxUlD4Y9ENdD5PACgq/eZ ptzb/VC56JFh/Iiepy+bK/s= =wpdw -----END PGP SIGNATURE-----