From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 18 Aug 2001 12:23:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 18 Aug 2001 12:23:04 -0400 Received: from citd-ppp.paderlinx.de ([193.189.252.149]:62215 "EHLO mail.citd.de") by vger.kernel.org with ESMTP id ; Sat, 18 Aug 2001 12:22:53 -0400 Date: Sat, 18 Aug 2001 18:23:00 +0200 From: Matthias Schniedermeyer To: Alan Cox Cc: linux-kernel@vger.kernel.org Subject: Re: Strange Slowdown Message-ID: <20010818182300.A15860@citd.de> In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: ; from alan@lxorguk.ukuu.org.uk on Sat, Aug 18, 2001 at 01:57:02PM +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > > After i switched "High Memory-Support" to "OFF"(4GB Before) the speed went > > to normal, but now less than half RAM is used. > > Any suggestions? > > This sounds like the top of memory is running uncached due to wrong mtrr > settings from the BIOS. Can you post your /proc/mtrr Because of other reasons i'm back to 2.2.19 /proc/mtrr from 2.2.19 show this -- /proc/mtrr -- reg00: base=0x00000000 ( 0MB), size=1024MB: write-back, count=1 reg01: base=0x40000000 (1024MB), size= 512MB: write-back, count=1 reg02: base=0x60000000 (1536MB), size= 256MB: write-back, count=1 reg03: base=0x70000000 (1792MB), size= 128MB: write-back, count=1 reg04: base=0x78000000 (1920MB), size= 64MB: write-back, count=1 reg05: base=0x7c000000 (1984MB), size= 32MB: write-back, count=1 -- end -- (32MB "missing". Seems like Linux uses these "missing" MBs.) For the 2.4.X-Kernel i had switched off the MTRR-Kernel-Option! Maybe i should try it another time with MTRR-Support switched on. Or i should use "mem=2016M". Bis denn -- Real Programmers consider "what you see is what you get" to be just as bad a concept in Text Editors as it is in women. No, the Real Programmer wants a "you asked for it, you got it" text editor -- complicated, cryptic, powerful, unforgiving, dangerous.