From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:37094 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933577AbcKOVbd (ORCPT ); Tue, 15 Nov 2016 16:31:33 -0500 Date: Tue, 15 Nov 2016 13:31:10 -0800 From: Shaohua Li To: Bart Van Assche CC: "linux-block@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "Kernel-team@fb.com" , "axboe@fb.com" , "tj@kernel.org" , "vgoyal@redhat.com" Subject: Re: [PATCH V4 00/15] blk-throttle: add .high limit Message-ID: <20161115213108.GA28069@shli-mbp.local> References: <986ada43-3217-3277-724a-5c76f8dad74e@sandisk.com> <20161115000529.GA15160@shli-mbp.local> <20161115004922.GA16173@shli-mbp.local> <1bf8605a-9920-19ea-e2ab-2f3d747e55be@sandisk.com> <20161115012857.GA17239@shli-mbp.local> <6f33c69f-f382-1515-d83d-f1109f982ab3@sandisk.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" In-Reply-To: <6f33c69f-f382-1515-d83d-f1109f982ab3@sandisk.com> Sender: linux-block-owner@vger.kernel.org List-Id: linux-block@vger.kernel.org On Tue, Nov 15, 2016 at 11:53:39AM -0800, Bart Van Assche wrote: > On 11/14/2016 05:28 PM, Shaohua Li wrote: > > On Mon, Nov 14, 2016 at 05:18:28PM -0800, Bart Van Assche wrote: > > > Unless someone can convince me of the opposite I think that coming up with > > > an algorithm for estimating I/O cost is essential to guarantee I/O fairness > > > without requesting users to perform complicated parameter configurations. > > > > That's what I tried before: > > http://marc.info/?l=linux-kernel&m=145617863208940&w=2 > > That URL refers to v2 of this patch series. Sorry but I have not found the > I/O cost estimation algorithm I was referring to in v2 of this patch series. It's a v2, but not the v2 of this series. There is no algorithm to estimate I/O cost, that one just uses IOPS or bandwidth to determine I/O cost. Thanks, Shaohua