Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 8 Dec 2001 15:06:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 8 Dec 2001 15:06:04 -0500 Received: from ns.virtualhost.dk ([195.184.98.160]:34060 "EHLO virtualhost.dk") by vger.kernel.org with ESMTP id ; Sat, 8 Dec 2001 15:05:45 -0500 Date: Sat, 8 Dec 2001 21:05:29 +0100 From: Jens Axboe To: Ivanovich Cc: war , linux-kernel@vger.kernel.org Subject: Re: Impact of HIGHMEM? Message-ID: <20011208200529.GA11567@suse.de> In-Reply-To: <3C1263FE.EBD973FA@starband.net> <01120820485101.01267@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <01120820485101.01267@localhost.localdomain> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Dec 08 2001, Ivanovich wrote: > A Dissabte 08 Desembre 2001 20:03, war va escriure: > > Does anyone have any benchmarks as to how much HIGHMEM affects > > performance in Linux? > > > > Searched google.com + groups.google.com, couldn't find anything solid > > though. > > why don't you try to compile a kernel with HIGHMEM and another without it and > then run some benchmarks in each one and compare? You'll very quickly spend a significant amount of sys time copying pages back and forth. > not everyone have the amount of ram to test this (i only have > 256...(sigh)) if i had that amount i would run some bench... You don't need lots of mem to test highmem impact, just grab the highmem debug patch from Andrea: kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.17pre4aa1/20_highmem-debug-7 -- 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/