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Date: Fri, 4 Mar 2016 13:10:31 -0500 From: "Austin S. Hemmelgarn" <ahferroin7@...il.com> To: Christoph Hellwig <hch@...radead.org>, Linus Walleij <linus.walleij@...aro.org> Cc: Tejun Heo <tj@...nel.org>, Paolo Valente <paolo.valente@...aro.org>, Jens Axboe <axboe@...nel.dk>, Fabio Checconi <fchecconi@...il.com>, Arianna Avanzini <avanzini.arianna@...il.com>, linux-block@...r.kernel.org, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Ulf Hansson <ulf.hansson@...aro.org>, Mark Brown <broonie@...nel.org> Subject: Re: [PATCH RFC 09/22] block, cfq: replace CFQ with the BFQ-v0 I/O scheduler On 2016-03-04 12:39, Christoph Hellwig wrote: > On Sat, Mar 05, 2016 at 12:29:39AM +0700, Linus Walleij wrote: >> Hi Tejun, >> >> I'm doing a summary of this discussion as a part of presenting >> Linaro's involvement in Paolo's work. So I try to understand things. > > Btw, can someone explain why you guys waste so much time hacking and > arguing about a legacy codebase (old request code and I/O schedulers) > that everyone would really like to see disappear. Why don't you > spend your time on blk-mq where you have an entirely clean slate > for scheduling? > 1. This all started long before blk-mq hit mainline. 2. There's still a decent amount of block drivers that don't support blk-mq. Last time I looked (around the time 4.4 came out), I saw the following that either obviously don't support it, or are ambiguous as to whether they support it or not. Here's a list of just the ones I know are being used on existing systems running relatively recent kernel versions, not including any of the MTD stuff: * fd * MD * bcache * mmcblk * nbd * dasd * drbd * rbd * aoe * xvd (I know there were patches for this floating around, but I never saw if they got merged or not)
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