Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262484AbTIPTxy (ORCPT ); Tue, 16 Sep 2003 15:53:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262488AbTIPTxy (ORCPT ); Tue, 16 Sep 2003 15:53:54 -0400 Received: from dspnet.fr.eu.org ([62.73.5.179]:30214 "EHLO dspnet.fr.eu.org") by vger.kernel.org with ESMTP id S262484AbTIPTxr (ORCPT ); Tue, 16 Sep 2003 15:53:47 -0400 Date: Tue, 16 Sep 2003 21:53:45 +0200 From: Olivier Galibert To: Pavel Machek Cc: Alan Cox , Stephan von Krawczynski , Marcelo Tosatti , neilb@cse.unsw.edu.au, Linux Kernel Mailing List Subject: Re: experiences beyond 4 GB RAM with 2.4.22 Message-ID: <20030916195345.GB68728@dspnet.fr.eu.org> Mail-Followup-To: Olivier Galibert , Pavel Machek , Alan Cox , Stephan von Krawczynski , Marcelo Tosatti , neilb@cse.unsw.edu.au, Linux Kernel Mailing List References: <20030916102113.0f00d7e9.skraw@ithnet.com> <20030916153658.3081af6c.skraw@ithnet.com> <1063722973.10037.65.camel@dhcp23.swansea.linux.org.uk> <20030916171057.GA8210@openzaurus.ucw.cz> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="+QahgC5+KEYLbs62" Content-Disposition: inline In-Reply-To: <20030916171057.GA8210@openzaurus.ucw.cz> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9901 Lines: 157 --+QahgC5+KEYLbs62 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Sep 16, 2003 at 07:10:57PM +0200, Pavel Machek wrote: > Hi! > > > > Well, I do understand the bounce buffer problem, but honestly the current way > > > of handling the situation seems questionable at least. If you ever tried such a > > > system you notice it is a lot worse than just dumping the additional ram above > > > 4GB. You can really watch your network connections go bogus which is just > > > unacceptable. Is there any thinkable way to ommit the bounce buffers and still > > > do something useful with the beyond-4GB ram parts? > > > > The 2.6 tree is somewhat better about this but at the end of the day if > > your I/O subsystem can't do the job your box will not perform ideally. > > For some workloads its a huge win to have the extra RAM, for others the > > I/O is a real pain. > > If he has trouble logging in, then there's a bug somewhere. > Bounce buffers should not slow machine down more than > 2x, and from his description it looks like way worse slowdown. The box does not just slowdown, the box crawls on the floor wimpering. Nothing works except ping until the i/os are finished (and they seem to crawl too), then everything works perfectly again. We're quite eager to fix the problem too, if you want us to test some things. 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