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, 25 Aug 2001 15:36:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 25 Aug 2001 15:35:59 -0400 Received: from islay.mach.uni-karlsruhe.de ([129.13.162.92]:51120 "EHLO mailout.plan9.de") by vger.kernel.org with ESMTP id ; Sat, 25 Aug 2001 15:35:43 -0400 Date: Sat, 25 Aug 2001 21:35:36 +0200 From: To: Alan Cox Cc: Daniel Phillips , Rik van Riel , Roger Larsson , linux-kernel@vger.kernel.org Subject: Re: [resent PATCH] Re: very slow parallel read performance Message-ID: <20010825213536.D18523@cerebro.laendle> Mail-Followup-To: Alan Cox , Daniel Phillips , Rik van Riel , Roger Larsson , linux-kernel@vger.kernel.org In-Reply-To: <20010825163648Z16186-32383+1334@humbolt.nl.linux.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Operating-System: Linux version 2.4.8-ac8 (root@cerebro) (gcc version 3.0.1) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Aug 25, 2001 at 08:15:44PM +0100, Alan Cox wrote: > How much disk and bandwidth can you afford. With vsftpd its certainly over > 1000 parallal downloads on a decent PII box exactly this is a point: my disk can do 5mb/s with almost random seeks, and linux indeed reads 5mb/s from it. but the userpsace process doing read() only ever sees 2mb/s because the kernel throes away all the nice pages. I doubt vsftpd would help at all. (one can easily get 2000 or more parallel downloads, if you are willing to go with 1kb/s). -- -----==- | ----==-- _ | ---==---(_)__ __ ____ __ Marc Lehmann +-- --==---/ / _ \/ // /\ \/ / pcg@goof.com |e| -=====/_/_//_/\_,_/ /_/\_\ XX11-RIPE --+ The choice of a GNU generation | |