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, 26 Aug 2001 19:24:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 26 Aug 2001 19:24:38 -0400 Received: from islay.mach.uni-karlsruhe.de ([129.13.162.92]:10935 "EHLO mailout.plan9.de") by vger.kernel.org with ESMTP id ; Sun, 26 Aug 2001 19:24:25 -0400 Date: Mon, 27 Aug 2001 01:24:39 +0200 From: To: Daniel Phillips Cc: linux-kernel@vger.kernel.org Subject: Re: [resent PATCH] Re: very slow parallel read performance Message-ID: <20010827012439.D6755@cerebro.laendle> Mail-Followup-To: Daniel Phillips , linux-kernel@vger.kernel.org In-Reply-To: <20010826172310Z16216-32383+1477@humbolt.nl.linux.org> <20010826211847.B2994@cerebro.laendle> <20010826210026Z16294-32383+1508@humbolt.nl.linux.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20010826210026Z16294-32383+1508@humbolt.nl.linux.org> 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 Sun, Aug 26, 2001 at 11:07:07PM +0200, Daniel Phillips wrote: > To recap, you made these changes: > > - Changed to -ac > - Set max-readahead through proc > > Anything else? Did you change MAX_SECTORS? no, I tinkered a lot with my server (freeing up memory), which obviously helped somewhat and increased socket buffers to 256k max., makeing i/o more chunky and thus more efficient. i also use more than one reader thread: under linus' kernels more than one thread made the situation worse, on the ac kernels they seem to slightly improve throughout, up to a point. > > no longer thrashing. And linux does the job nicely ;) > Good, but should we rest on our laurels now? well, linux-2.4 has a lot of dark corners that need improving, but the machine does no longer totally misbehave (4 or 5 mb/s is debatable, but 2mb/s with more memory and higher load is not ;). it's now acceptable to me ;) -- -----==- | ----==-- _ | ---==---(_)__ __ ____ __ Marc Lehmann +-- --==---/ / _ \/ // /\ \/ / pcg@goof.com |e| -=====/_/_//_/\_,_/ /_/\_\ XX11-RIPE --+ The choice of a GNU generation | |