From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 27 May 2001 17:35:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 27 May 2001 17:35:30 -0400 Received: from chromium11.wia.com ([207.66.214.139]:37638 "EHLO neptune.kirkland.local") by vger.kernel.org with ESMTP id ; Sun, 27 May 2001 17:35:18 -0400 Message-ID: <3B117412.A196A70C@chromium.com> Date: Sun, 27 May 2001 14:39:30 -0700 From: Fabio Riccardi X-Mailer: Mozilla 4.77 [en] (X11; U; Linux 2.4.2 i686) X-Accept-Language: en MIME-Version: 1.0 To: Alan Cox CC: linux-kernel@vger.kernel.org Subject: Re: 2.4.5-ac1 won't boot with 4GB bigmem option In-Reply-To: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Alan Cox wrote: > > > mm: critical shortage of bounce buffers. > > > > Indeed this message has been pestering me in all the recent .4-acx kernels when > > the machine is under heavy FS pressure. > > > > In these kernels I observe a significative (5-10%) performance degradation as > > soon as the FS cache fills up all the available memory, at this moment "kswapd" > > Its there to prove we had a problem granted > > 2.4.2-acx and early 2.4.3-acx kernles were much better in this respect and a lot > > more stable. > > Hit any 2.4 kernel pre 2.4.5 vanilla [maybe fixed] and you will break bigmem > that way. I've been using many kernels (I upgrade every week or so) and as far as I can recollect I started experiencing serious performance problems with the 2.4.4 series. I'm double checking my data right now with older kernels. - Fabio