From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 23 Nov 2001 06:30:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 23 Nov 2001 06:30:01 -0500 Received: from mx3.port.ru ([194.67.57.13]:63247 "EHLO smtp3.port.ru") by vger.kernel.org with ESMTP id ; Fri, 23 Nov 2001 06:29:50 -0500 From: Samium Gromoff <_deepfire@mail.ru> Message-Id: <200111231132.fANBWbk11468@vegae.deep.net> Subject: Re: Heavy disk IO stalls ftp/http downloads To: harisri@bigpond.com Date: Fri, 23 Nov 2001 14:32:36 +0300 (MSK) Cc: linux-kernel@vger.kernel.org X-Mailer: ELM [version 2.5 PL6] MIME-Version: 1.0 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 does hdparm -u1 fixes the problem? -u1 == unmasq irq during its handling the problem is that serial port need its interrupt to be served with minimal latency, and the drives makes that impossible, unless irqs are unmasked... looks like ( = - disc io irq handling periods, . - the ones of serial port): both ones wants something like: disc: ========= ============= ================== ============= ========= serial: . . . . . . . . . . . . . . . . . . . . . . . in reality: ==============.=============. ============= =========== etc etc... cheers, Samium Gromoff