From owner-freebsd-stable@FreeBSD.ORG Tue Dec 4 12:14:26 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 BE70216A420 for ; Tue, 4 Dec 2007 12:14:26 +0000 (UTC) (envelope-from rwatson@FreeBSD.org) Received: from cyrus.watson.org (cyrus.watson.org [209.31.154.42]) by mx1.freebsd.org (Postfix) with ESMTP id 92BBA13C4E5 for ; Tue, 4 Dec 2007 12:14:26 +0000 (UTC) (envelope-from rwatson@FreeBSD.org) Received: from fledge.watson.org (fledge.watson.org [209.31.154.41]) by cyrus.watson.org (Postfix) with ESMTP id 9987846F96; Tue, 4 Dec 2007 07:19:14 -0500 (EST) Date: Tue, 4 Dec 2007 12:14:18 +0000 (GMT) From: Robert Watson X-X-Sender: robert@fledge.watson.org To: Krassimir Slavchev In-Reply-To: <47553170.90409@bulinfo.net> Message-ID: <20071204121329.N87930@fledge.watson.org> 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> <47553170.90409@bulinfo.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: freebsd-stable@freebsd.org, Alexey Popov 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 12:14:26 -0000 On Tue, 4 Dec 2007, Krassimir Slavchev 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 A casual reading suggests that this article is about FreeBSD 6.2, and not FreeBSD 7.0. Am I misreading? Robert N M Watson Computer Laboratory University of Cambridge > >> >>>>> 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----- >