From: Paolo Valente <paolo.valente@linaro.org> To: Jens Axboe <axboe@kernel.dk> Cc: Tejun Heo <tj@kernel.org>, Fabio Checconi <fchecconi@gmail.com>, Arianna Avanzini <avanzini.arianna@gmail.com>, linux-block@vger.kernel.org, Linux-Kernal <linux-kernel@vger.kernel.org>, Ulf Hansson <ulf.hansson@linaro.org>, Linus Walleij <linus.walleij@linaro.org>, broonie@kernel.org Subject: Re: [PATCH RFC 01/14] block, bfq: introduce the BFQ-v0 I/O scheduler as an extra scheduler Date: Sun, 5 Mar 2017 17:02:19 +0100 [thread overview] Message-ID: <060CBCB3-AB73-4F88-9CDC-828F502A8FF7@linaro.org> (raw) In-Reply-To: <91b856e8-2c14-00b6-fdd8-b9879b1b9952@kernel.dk> > Il giorno 05 mar 2017, alle ore 16:16, Jens Axboe <axboe@kernel.dk> ha = scritto: >=20 > On 03/04/2017 09:01 AM, Paolo Valente wrote: >> We tag as v0 the version of BFQ containing only BFQ's engine plus >> hierarchical support. BFQ's engine is introduced by this commit, = while >> hierarchical support is added by next commit. We use the v0 tag to >> distinguish this minimal version of BFQ from the versions containing >> also the features and the improvements added by next commits. BFQ-v0 >> coincides with the version of BFQ submitted a few years ago [1], = apart >> from the introduction of preemption, described below. >>=20 >> BFQ is a proportional-share I/O scheduler, whose general structure, >> plus a lot of code, are borrowed from CFQ. >=20 > I'll take a closer look at this in the coming week. ok > But one quick > comment - don't default to BFQ. Both because it might not be fully > stable yet, and also because the performance limitation of it is > quite severe. Whereas deadline doesn't really hurt single queue > flash at all, BFQ will. >=20 Ok, sorry. I was doubtful on what to do, but, to not bother you on every details, I went for setting it as default, because I thought people would have preferred to test it, even from boot, in this preliminary stage. I reset elevator.c in the submission, unless you want me to do it even before receiving your and others' reviews. > Generally, I think that sort of logic should go into a udev rule. If > a device is rotational it should default to BFQ once the dust has > settled. >=20 ok Looking forward for your feedback, Paolo > --=20 > Jens Axboe >=20
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Valente <paolo.valente@linaro.org> To: Jens Axboe <axboe@kernel.dk> Cc: Tejun Heo <tj@kernel.org>, Fabio Checconi <fchecconi@gmail.com>, Arianna Avanzini <avanzini.arianna@gmail.com>, linux-block@vger.kernel.org, Linux-Kernal <linux-kernel@vger.kernel.org>, Ulf Hansson <ulf.hansson@linaro.org>, Linus Walleij <linus.walleij@linaro.org>, broonie@kernel.org Subject: Re: [PATCH RFC 01/14] block, bfq: introduce the BFQ-v0 I/O scheduler as an extra scheduler Date: Sun, 5 Mar 2017 17:02:19 +0100 [thread overview] Message-ID: <060CBCB3-AB73-4F88-9CDC-828F502A8FF7@linaro.org> (raw) In-Reply-To: <91b856e8-2c14-00b6-fdd8-b9879b1b9952@kernel.dk> > Il giorno 05 mar 2017, alle ore 16:16, Jens Axboe <axboe@kernel.dk> ha scritto: > > On 03/04/2017 09:01 AM, Paolo Valente wrote: >> We tag as v0 the version of BFQ containing only BFQ's engine plus >> hierarchical support. BFQ's engine is introduced by this commit, while >> hierarchical support is added by next commit. We use the v0 tag to >> distinguish this minimal version of BFQ from the versions containing >> also the features and the improvements added by next commits. BFQ-v0 >> coincides with the version of BFQ submitted a few years ago [1], apart >> from the introduction of preemption, described below. >> >> BFQ is a proportional-share I/O scheduler, whose general structure, >> plus a lot of code, are borrowed from CFQ. > > I'll take a closer look at this in the coming week. ok > But one quick > comment - don't default to BFQ. Both because it might not be fully > stable yet, and also because the performance limitation of it is > quite severe. Whereas deadline doesn't really hurt single queue > flash at all, BFQ will. > Ok, sorry. I was doubtful on what to do, but, to not bother you on every details, I went for setting it as default, because I thought people would have preferred to test it, even from boot, in this preliminary stage. I reset elevator.c in the submission, unless you want me to do it even before receiving your and others' reviews. > Generally, I think that sort of logic should go into a udev rule. If > a device is rotational it should default to BFQ once the dust has > settled. > ok Looking forward for your feedback, Paolo > -- > Jens Axboe >
next prev parent reply other threads:[~2017-03-05 16:02 UTC|newest] Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-03-04 16:01 [PATCH RFC 00/14] Add the BFQ I/O Scheduler to blk-mq Paolo Valente 2017-03-04 16:01 ` [PATCH RFC 01/14] block, bfq: introduce the BFQ-v0 I/O scheduler as an extra scheduler Paolo Valente 2017-03-05 15:16 ` Jens Axboe 2017-03-05 16:02 ` Paolo Valente [this message] 2017-03-05 16:02 ` Paolo Valente 2017-03-06 20:46 ` Jens Axboe 2017-03-14 11:28 ` Paolo Valente 2017-03-14 11:28 ` Paolo Valente 2017-03-06 19:40 ` Bart Van Assche 2017-03-06 19:40 ` Bart Van Assche 2017-03-14 14:18 ` Paolo Valente 2017-03-14 14:18 ` Paolo Valente 2017-03-18 12:08 ` Paolo Valente 2017-03-18 12:08 ` Paolo Valente 2017-03-18 15:24 ` Bart Van Assche 2017-03-18 15:24 ` Bart Van Assche 2017-03-19 11:45 ` Paolo Valente 2017-03-19 11:45 ` Paolo Valente 2017-03-07 23:22 ` Jens Axboe 2017-03-18 12:41 ` Paolo Valente 2017-03-18 12:41 ` Paolo Valente 2017-03-04 16:01 ` [PATCH RFC 02/14] block, bfq: add full hierarchical scheduling and cgroups support Paolo Valente 2017-03-04 16:01 ` [PATCH RFC 03/14] block, bfq: improve throughput boosting Paolo Valente 2017-03-04 16:01 ` [PATCH RFC 04/14] block, bfq: modify the peak-rate estimator Paolo Valente 2017-03-07 0:47 ` Bart Van Assche 2017-03-07 0:47 ` Bart Van Assche 2017-03-04 16:01 ` [PATCH RFC 05/14] block, bfq: add more fairness with writes and slow processes Paolo Valente 2017-03-04 16:01 ` [PATCH RFC 06/14] block, bfq: improve responsiveness Paolo Valente 2017-03-04 16:01 ` [PATCH RFC 07/14] block, bfq: reduce I/O latency for soft real-time applications Paolo Valente 2017-03-04 16:01 ` [PATCH RFC 08/14] block, bfq: preserve a low latency also with NCQ-capable drives Paolo Valente 2017-03-04 16:01 ` [PATCH RFC 09/14] block, bfq: reduce latency during request-pool saturation Paolo Valente 2017-03-04 16:01 ` [PATCH RFC 10/14] block, bfq: add Early Queue Merge (EQM) Paolo Valente 2017-03-07 17:44 ` Jens Axboe 2017-03-15 12:01 ` Paolo Valente 2017-03-15 12:01 ` Paolo Valente 2017-03-15 15:47 ` Jens Axboe 2017-03-15 16:30 ` Jens Axboe 2017-03-15 16:59 ` Paolo Valente 2017-03-15 16:59 ` Paolo Valente 2017-03-15 21:00 ` Jens Axboe 2017-03-18 10:33 ` Paolo Valente 2017-03-18 10:33 ` Paolo Valente 2017-03-15 16:56 ` Jens Axboe 2017-03-15 17:02 ` Paolo Valente 2017-03-15 17:02 ` Paolo Valente 2017-03-15 21:01 ` Jens Axboe 2017-03-04 16:01 ` [PATCH RFC 11/14] block, bfq: reduce idling only in symmetric scenarios Paolo Valente 2017-03-04 16:01 ` [PATCH RFC 12/14] block, bfq: boost the throughput on NCQ-capable flash-based devices Paolo Valente 2017-03-04 16:01 ` [PATCH RFC 13/14] block, bfq: boost the throughput with random I/O on NCQ-capable HDDs Paolo Valente 2017-03-07 0:54 ` Bart Van Assche 2017-03-07 0:54 ` Bart Van Assche 2017-03-14 14:12 ` Paolo Valente 2017-03-14 14:12 ` Paolo Valente 2017-03-04 16:01 ` [PATCH RFC 14/14] block, bfq: handle bursts of queue activations Paolo Valente 2017-03-06 7:43 ` [PATCH RFC 00/14] Add the BFQ I/O Scheduler to blk-mq Markus Trippelsdorf 2017-03-31 13:27 ` Paolo Valente 2017-03-31 13:27 ` Paolo Valente 2017-03-07 0:22 ` Bart Van Assche 2017-03-07 0:22 ` Bart Van Assche 2017-03-14 14:12 ` Paolo Valente 2017-03-14 14:12 ` Paolo Valente 2017-03-07 1:00 ` Bart Van Assche 2017-03-07 1:00 ` Bart Van Assche 2017-03-14 15:35 ` Paolo Valente 2017-03-14 15:35 ` Paolo Valente 2017-03-14 15:42 ` Jens Axboe 2017-03-14 16:32 ` Bart Van Assche 2017-03-14 16:32 ` Bart Van Assche 2017-03-18 10:52 ` Paolo Valente 2017-03-18 10:52 ` Paolo Valente 2017-03-18 17:09 ` Linus Walleij 2017-03-18 17:46 ` Bart Van Assche 2017-03-18 17:46 ` Bart Van Assche 2017-03-18 20:46 ` Linus Walleij 2017-03-19 12:14 ` Paolo Valente 2017-03-19 12:14 ` Paolo Valente 2017-03-20 18:40 ` Jens Axboe
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