From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760261AbYBNQVT (ORCPT ); Thu, 14 Feb 2008 11:21:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753740AbYBNQVJ (ORCPT ); Thu, 14 Feb 2008 11:21:09 -0500 Received: from minas.ics.muni.cz ([147.251.4.40]:54386 "EHLO minas.ics.muni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753700AbYBNQVH (ORCPT ); Thu, 14 Feb 2008 11:21:07 -0500 Date: Thu, 14 Feb 2008 17:21:04 +0100 From: Lukas Hejtmanek To: linux-kernel@vger.kernel.org Subject: Disk schedulers Message-ID: <20080214162104.GA5347@ics.muni.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: 8bit X-echelon: NSA, CIA, CI5, MI5, FBI, KGB, BIS, Plutonium, Bin Laden, bomb User-Agent: Mutt/1.5.17+20080114 (2008-01-14) X-Muni-Spam-TestIP: 147.251.54.96 X-Muni-Envelope-From: xhejtman@anubis.fi.muni.cz X-Muni-Virus-Test: Clean X-Greylist: Sender succeeded SMTP AUTH authentication, not delayed by milter-greylist-3.0 (minas.ics.muni.cz [147.251.4.35]); Thu, 14 Feb 2008 17:21:05 +0100 (CET) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, whom should I blame about disk schedulers? I have the following setup: 1Gb network 2GB RAM disk write speed about 20MB/s If I'm scping file (about 500MB) from the network (which is faster than the local disk), any process is totally unable to read anything from the local disk till the scp finishes. It is not caused by low free memory, while scping I have 500MB of free memory (not cached or buffered). I tried cfq and anticipatory scheduler, none is different. -- Lukáš Hejtmánek