From owner-svn-src-all@FreeBSD.ORG Tue Jan 26 20:12:27 2010 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BAC881065670; Tue, 26 Jan 2010 20:12:27 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from cyrus.watson.org (cyrus.watson.org [65.122.17.42]) by mx1.freebsd.org (Postfix) with ESMTP id 87F0F8FC17; Tue, 26 Jan 2010 20:12:27 +0000 (UTC) Received: from bigwig.baldwin.cx (66.111.2.69.static.nyinternet.net [66.111.2.69]) by cyrus.watson.org (Postfix) with ESMTPSA id 39D0546B23; Tue, 26 Jan 2010 15:12:27 -0500 (EST) Received: from jhbbsd.localnet (smtp.hudson-trading.com [209.249.190.9]) by bigwig.baldwin.cx (Postfix) with ESMTPA id 641318A01F; Tue, 26 Jan 2010 15:12:26 -0500 (EST) From: John Baldwin To: Ivan Voras Date: Tue, 26 Jan 2010 15:07:21 -0500 User-Agent: KMail/1.12.1 (FreeBSD/7.2-CBSD-20100120; KDE/4.3.1; amd64; ; ) References: <201001231842.o0NIgSa5086957@svn.freebsd.org> <20100126141525.10365e5dzlk7jc4k@webmail.leidinger.net> <9bbcef731001260905u36436624rfcf466765eee1f6a@mail.gmail.com> In-Reply-To: <9bbcef731001260905u36436624rfcf466765eee1f6a@mail.gmail.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <201001261507.21399.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.0.1 (bigwig.baldwin.cx); Tue, 26 Jan 2010 15:12:26 -0500 (EST) X-Virus-Scanned: clamav-milter 0.95.1 at bigwig.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-2.6 required=4.2 tests=AWL,BAYES_00 autolearn=ham version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on bigwig.baldwin.cx Cc: Alan Cox , Alexander Leidinger , svn-src-all@freebsd.org, src-committers@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r202894 - in head/sys/i386: i386 include X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 Jan 2010 20:12:27 -0000 On Tuesday 26 January 2010 12:05:29 pm Ivan Voras wrote: > 2010/1/26 Alexander Leidinger : > > > > Quoting John Baldwin (from Mon, 25 Jan 2010 07:57:49 > > -0500): > > > >> On Saturday 23 January 2010 1:42:28 pm Alan Cox wrote: > >>> > >>> Author: alc > >>> Date: Sat Jan 23 18:42:28 2010 > >>> New Revision: 202894 > >>> URL: http://svn.freebsd.org/changeset/base/202894 > >>> > >>> Log: > >>> Handle a race between pmap_kextract() and pmap_promote_pde(). This race > >>> is > >>> known to cause a kernel crash in ZFS on i386 when superpage promotion is > >>> enabled. > >>> > >>> Tested by: netchild > >>> MFC after: 1 week > >> > >> Yay! Should we enable pg_ps by default on i386 now? > > > > Data point, the i386 system where I have superpages enabled is a p4 with > > currently 11 jails active. Some webservers, squid, samba, bind, postfix and > > a lot of portupgrades (during the last days, I'm updating a jail with a > > desktop-setup inside). All jails are on ZFS. > > Do you have any method of comparing performance before-and-after? > There was a thread on some of the mailing lists (stable@/current@?) > about squid being the pessimal case for superpages. The thread did not say that superpages made squid slower, rather that due to the way it forked to execute the log rotation binaries, some superpages were demoted back to regular pages losing the gain of superpages for those pages. -- John Baldwin