Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756753Ab1BJTuU (ORCPT ); Thu, 10 Feb 2011 14:50:20 -0500 Received: from mail.tpi.com ([70.99.223.143]:2360 "EHLO mail.tpi.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752114Ab1BJTuT (ORCPT ); Thu, 10 Feb 2011 14:50:19 -0500 X-Greylist: delayed 1692 seconds by postgrey-1.27 at vger.kernel.org; Thu, 10 Feb 2011 14:50:19 EST Message-ID: <4D543AD6.4000908@canonical.com> Date: Thu, 10 Feb 2011 12:21:58 -0700 From: Tim Gardner Reply-To: tim.gardner@canonical.com User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101208 Thunderbird/3.1.7 MIME-Version: 1.0 To: "Haefliger, Juerg" CC: Vivek Goyal , LKML Subject: Re: Block IO throttling disabled in distros References: <59DD1BA8FD3C0F4C90771C18F2B5B53A653FF7284B@GVW0432EXB.americas.hpqcorp.net> <20110207160451.GH7437@redhat.com> <59DD1BA8FD3C0F4C90771C18F2B5B53A653FF72FB5@GVW0432EXB.americas.hpqcorp.net> In-Reply-To: <59DD1BA8FD3C0F4C90771C18F2B5B53A653FF72FB5@GVW0432EXB.americas.hpqcorp.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1405 Lines: 40 On 02/08/2011 12:24 AM, Haefliger, Juerg wrote: >> On Mon, Feb 07, 2011 at 03:33:38PM +0000, Haefliger, Juerg wrote: >>> Hi, >>> >>> Both RHEL6 and Ubuntu 10.10 have block IO throttling disabled in >> their kernels. Does anybody know why that is? Are there performance or >> stability issues with the throttling controller or does it somehow >> negatively interfere with the rest of the kernel and/or system? >> >> Block IO throttling support was not even upstream at that time hence >> you don't see it. > > Duh! I thought I checked that the code was there but just not enabled. I just double-checked and sure enough block IO throttling is not in the RHEL6 kernel source. Sorry for the noise. > > Thanks > ...Juerg > > >> I have not heard about any stability issues so far. Of course more >> testing will reveal that. >> >> The only thing I have thinking is that should we limit the number of >> bios queued per IO context on the device. Currently there is no such limit >> and one can queue up as many bios as one want to. >> >> >> Thanks >> Vivek > -- CONFIG_BLK_DEV_THROTTLING=y in what will be Ubuntu 11.04 rtg -- Tim Gardner tim.gardner@canonical.com -- 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/