Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754543AbYBTLeF (ORCPT ); Wed, 20 Feb 2008 06:34:05 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751236AbYBTLdx (ORCPT ); Wed, 20 Feb 2008 06:33:53 -0500 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:4736 "EHLO spitz.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751126AbYBTLdv (ORCPT ); Wed, 20 Feb 2008 06:33:51 -0500 Date: Sat, 16 Feb 2008 17:20:49 +0000 From: Pavel Machek To: Lukas Hejtmanek Cc: linux-kernel@vger.kernel.org Subject: Re: Disk schedulers Message-ID: <20080216172048.GB3979@ucw.cz> References: <20080214162104.GA5347@ics.muni.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080214162104.GA5347@ics.muni.cz> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1018 Lines: 30 Hi! > 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. Is cat /dev/zero > file enough to reproduce this? ext3 filesystem? Will cat /etc/passwd work while machine is unresponsive? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- 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/