From: Paolo Valente <paolo.valente@linaro.org>
To: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Cc: linux-block@vger.kernel.org, Ben Hutchings <ben@decadent.org.uk>
Subject: Re: blk-mq 5-8 times slower for bmap-tools
Date: Fri, 17 Aug 2018 19:35:18 +0200 [thread overview]
Message-ID: <5F152F61-4DBE-4394-939B-D5F82EEE72AE@linaro.org> (raw)
In-Reply-To: <CAPybu_2k-0d=8NxL7kr757QcWOnXyU_TAyV7DMwiMrSDkiXfgA@mail.gmail.com>
> Il giorno 17 ago 2018, alle ore 19:31, Ricardo Ribalda Delgado =
<ricardo.ribalda@gmail.com> ha scritto:
>=20
> Hello
>=20
> Coming from: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=3D906328
>=20
> bmaptools is kind of a "smart dd" tool, that lets you write images
> very fast and securely. Since the last Debian Kernel update it has
> become 5-8 times slower.
>=20
> After some debugging, we have figured out that the reason for that
> slowness is the Multi-Queue Block IO Queueing Mechanism.
>=20
> Debian maintainer has pointed out that in the near future the single
> queue will be deprecated.
>=20
> My question is if we can get a similar perfomance for bmaptools with
> blk-mq and how?
>=20
Have you also checked what happens after switching to a different I/O
scheduler for the involved drive (among none, mq-deadline, bfq and
kyber)?
Paolo
> Thanks!
>=20
> --=20
> Ricardo Ribalda
next prev parent reply other threads:[~2018-08-17 20:39 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-17 17:31 blk-mq 5-8 times slower for bmap-tools Ricardo Ribalda Delgado
2018-08-17 17:35 ` Paolo Valente [this message]
2018-08-17 17:39 ` Ricardo Ribalda Delgado
2018-08-17 17:41 ` Jens Axboe
2018-08-17 17:49 ` Ricardo Ribalda Delgado
2018-08-17 21:23 ` Jens Axboe
2018-08-17 17:42 ` Paolo Valente
2018-08-17 17:52 ` Ricardo Ribalda Delgado
2018-08-17 23:43 ` Ming Lei
[not found] ` <CAPybu_2ke4usj9Qwr9iSKTymAk1510pzZnZAgLemRB+cK4Se1A@mail.gmail.com>
2018-08-20 8:30 ` Ming Lei
2018-08-20 9:04 ` Ricardo Ribalda Delgado
2018-08-20 9:55 ` Ming Lei
2018-08-20 9:56 ` Ricardo Ribalda Delgado
2018-08-20 10:15 ` Ming Lei
2018-08-20 11:42 ` Ming Lei
2018-08-20 11:45 ` Ming Lei
2018-08-22 19:22 ` Ben Hutchings
2018-08-22 22:02 ` Ming Lei
2018-08-23 0:51 ` Ben Hutchings
2018-08-23 2:17 ` Ming Lei
2018-08-23 6:29 ` Ricardo Ribalda Delgado
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