From owner-freebsd-current@FreeBSD.ORG Sun Dec 28 21:33:20 2008 Return-Path: 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 5AF641065674 for ; Sun, 28 Dec 2008 21:33:20 +0000 (UTC) (envelope-from c47g@gmx.at) Received: from mail.gmx.net (mail.gmx.net [213.165.64.20]) by mx1.freebsd.org (Postfix) with SMTP id BDBE68FC08 for ; Sun, 28 Dec 2008 21:33:19 +0000 (UTC) (envelope-from c47g@gmx.at) Received: (qmail invoked by alias); 28 Dec 2008 21:33:17 -0000 Received: from cm56-152-15.liwest.at (EHLO bones) [86.56.152.15] by mail.gmx.net (mp035) with SMTP; 28 Dec 2008 22:33:17 +0100 X-Authenticated: #9978462 X-Provags-ID: V01U2FsdGVkX1+NG/RC4JKNE1LI40fID4Xo/WbzhP2EkcSyIBbn0k FGjZDcSWGlPoGU From: Christian Gusenbauer To: "Li, Qing" Date: Sun, 28 Dec 2008 22:33:35 +0100 User-Agent: KMail/1.9.10 References: <200812281856.20118.c47g@gmx.at> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200812282233.35612.c47g@gmx.at> X-Y-GMX-Trusted: 0 X-FuHaFi: 0.58 Cc: qingli@freebsd.org, freebsd-current@freebsd.org Subject: Re: Network slowdown on lo0 introduced with svn186119/186121 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 Dec 2008 21:33:20 -0000 Hi Qing! Amanda uses two processes which communicate using a localhost-based tcp connection. I assume one of them is dump'ing the partition and sends the blocks to the other process, which stores them on tape or to another hard disk (which is the way I configured it). I did not configure amanda to use the localhost address though. My method of measurement is rather simple: a backup of my root partition (~ 800 MB) lasts about a 3 minutes with a kernel based on revision 186107. Using a kernel based on revision 186121 a backup of the same partition lasts more than 9 hours! I tested kernels of revisions 186133, 186150, 186176 and HEAD of today morning CET - all showing the same slowdown. Revisions 185984, 186061 and 186107 are ok. I did some tests with the 'echo' and 'discard' services of inetd, too, but I was not able to reproduce this slowdown. Many thanks, Christian. On Sunday 28 December 2008, Li, Qing wrote: > Hi Christian, > > Is the loopback address or an address that is assigned to > an interface used by amanda? Would it be possible for you > to give me some information on the tests you performed and > on your method of measurement? > > Thanks, > > -- Qing > > ________________________________ > > From: owner-freebsd-current@freebsd.org on behalf of Christian Gusenbauer > Sent: Sun 12/28/2008 9:56 AM > To: freebsd-current@freebsd.org > Subject: Network slowdown on lo0 introduced with svn186119/186121 > > > > Hi! > > Today I built a new kernel on current and experienced a massive network > slowdown on lo0 when doing a backup using amanda. I made some tests and it > seems that the commits 186119 and 186121 to the svn repository are causing > it. A kernel based on revision 186107 runs fine and all kernels starting > with revison 186119 do not. > > This slowdown seems to appear only on the loopback interface, not on my lan > interface. > > Is this a known issue? > > Regards, > Christian. > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"