From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 1 May 2001 09:49:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 1 May 2001 09:49:45 -0400 Received: from smtpde02.sap-ag.de ([194.39.131.53]:25769 "EHLO smtpde02.sap-ag.de") by vger.kernel.org with ESMTP id ; Tue, 1 May 2001 09:49:30 -0400 From: Christoph Rohland To: Alan Cox Cc: jamagallon@able.es (J . A . Magallon), R.E.Wolff@BitWizard.nl (Rogier Wolff), wakko@animx.eu.org (Wakko Warner), xavier.bestel@free.fr (Xavier Bestel), goswin.brederlow@student.uni-tuebingen.de (Goswin Brederlow), fluffy@snurgle.org (William T Wilson), Matt_Domsch@Dell.com, linux-kernel@vger.kernel.org Subject: Re: 2.4 and 2GB swap partition limit In-Reply-To: Organisation: SAP LinuxLab In-Reply-To: Message-ID: User-Agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.1 (Bryce Canyon) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: 01 May 2001 15:39:42 +0200 X-SAP: out X-SAP: out X-SAP: out X-SAP: out X-SAP: out X-SAP: out X-SAP: out X-SAP: out X-SAP: out Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi Alan, On Mon, 30 Apr 2001, Alan Cox wrote: >> paging in just released 2.4.4, but in previuos kernel, a page that >> was paged-out, reserves its place in swap even if it is paged-in >> again, so once you have paged-out all your ram at least once, you >> can't get any more memory, even if swap is 'empty'. > > This is a bug in the 2.4 VM, nothing more or less. It and the > horrible bounce buffer bugs are forcing large machines to remain on > 2.2. So it has to get fixed Yes, it is a bug. and thanks for stating this so clearly. But a lot of the big servers can go to 2.4. because SYSV shm/shm fs/tmpfs will reclaim the swap entries on swapin. So big databases and applications servers which rely on shm are not affected. Greetings Christoph