From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756622AbaEaNs3 (ORCPT ); Sat, 31 May 2014 09:48:29 -0400 Received: from mail-qa0-f45.google.com ([209.85.216.45]:52385 "EHLO mail-qa0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756390AbaEaNs1 (ORCPT ); Sat, 31 May 2014 09:48:27 -0400 Date: Sat, 31 May 2014 09:48:23 -0400 From: Tejun Heo To: Paolo Valente Cc: Jens Axboe , Li Zefan , Fabio Checconi , Arianna Avanzini , Paolo Valente , linux-kernel@vger.kernel.org, containers@lists.linux-foundation.org, cgroups@vger.kernel.org Subject: Re: [PATCH RFC - TAKE TWO - 08/12] block, bfq: preserve a low latency also with NCQ-capable drives Message-ID: <20140531134823.GB24557@mtj.dyndns.org> References: <20140528221929.GG1419@htj.dyndns.org> <1401354343-5527-1-git-send-email-paolo.valente@unimore.it> <1401354343-5527-9-git-send-email-paolo.valente@unimore.it> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1401354343-5527-9-git-send-email-paolo.valente@unimore.it> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, May 29, 2014 at 11:05:39AM +0200, Paolo Valente wrote: > This patch addresses this issue by not disabling device idling for This patch addresses this issue by allowing device idling for... > weight-raised queues, even if the device supports NCQ. This allows BFQ > to start serving a new queue, and therefore allows the drive to This disallows BFQ to start serving a new queue, and therefore the drive to prefetch new requests, until the idling timeout expires. Prefetch? Can you elaborate? Thanks. -- tejun