Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262882AbTIQTU2 (ORCPT ); Wed, 17 Sep 2003 15:20:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262902AbTIQTU2 (ORCPT ); Wed, 17 Sep 2003 15:20:28 -0400 Received: from ns.virtualhost.dk ([195.184.98.160]:2454 "EHLO virtualhost.dk") by vger.kernel.org with ESMTP id S262882AbTIQTUZ (ORCPT ); Wed, 17 Sep 2003 15:20:25 -0400 Date: Wed, 17 Sep 2003 21:19:46 +0200 From: Jens Axboe To: Alan Cox Cc: Olivier Galibert , 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: <20030917191946.GQ906@suse.de> References: <20030916102113.0f00d7e9.skraw@ithnet.com> <20030916153658.3081af6c.skraw@ithnet.com> <1063722973.10037.65.camel@dhcp23.swansea.linux.org.uk> <20030916172057.148a5741.skraw@ithnet.com> <1063726141.10036.130.camel@dhcp23.swansea.linux.org.uk> <20030916195858.GC68728@dspnet.fr.eu.org> <1063811445.12648.69.camel@dhcp23.swansea.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1063811445.12648.69.camel@dhcp23.swansea.linux.org.uk> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 976 Lines: 25 On Wed, Sep 17 2003, Alan Cox wrote: > On Maw, 2003-09-16 at 20:58, Olivier Galibert wrote: > > On Tue, Sep 16, 2003 at 04:29:02PM +0100, Alan Cox wrote: > > > The kernel has no idea what you will do with given ram. It does try to > > > make some guesses but you are basically trying to paper over hardware > > > limits. > > > > Is there a way to specifically turn that ram into a tmpfs though? > > > Something like z2ram copied and hacked a little to kmap the blocks it > wants would give you a block device you could use for swap or for /tmp. > Im not sure tmpfs would work here Aditionally, you need GFP_DMA32 or similar. Would also alleviate the nasty pressure on ZONE_NORMAL which is often quite stressed. -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/