Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758696Ab2JKNlf (ORCPT ); Thu, 11 Oct 2012 09:41:35 -0400 Received: from lxorguk.ukuu.org.uk ([81.2.110.251]:35854 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753616Ab2JKNlc (ORCPT ); Thu, 11 Oct 2012 09:41:32 -0400 Date: Thu, 11 Oct 2012 14:46:34 +0100 From: Alan Cox To: Alex Bligh Cc: linux-kernel@vger.kernel.org Subject: Re: Local DoS through write heavy I/O on CFQ & Deadline Message-ID: <20121011144634.7017e270@pyramind.ukuu.org.uk> In-Reply-To: <0B138F62-16BF-4295-9AD9-64C0BB39FCE2@alex.org.uk> References: <0B138F62-16BF-4295-9AD9-64C0BB39FCE2@alex.org.uk> X-Mailer: Claws Mail 3.8.1 (GTK+ 2.24.8; x86_64-redhat-linux-gnu) Face: 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 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 527 Lines: 11 > We have reproduced this on multiple hardware environments, using 3.2 > (/proc/version_signature gives "Ubuntu 3.2.0-29.46-generic 3.2.24"). > Anecdotally we believe the situation has worsened since 3.0. I've certainly seen this on 3.0 and 3.2, but do you still see it on 3.5/6 ? -- 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/