From: Mike Galbraith <efault@gmx.de>
To: Oleksandr Natalenko <oleksandr@natalenko.name>,
Paolo Valente <paolo.valente@linaro.org>
Cc: Jens Axboe <axboe@kernel.dk>, stable <stable@vger.kernel.org>
Subject: Re: [PATCH BUGFIX V3] block, bfq: add requeue-request hook
Date: Wed, 14 Feb 2018 14:25:41 +0100 [thread overview]
Message-ID: <1518614741.8220.19.camel@gmx.de> (raw)
In-Reply-To: <30107c3d7cc4dadb0d6949b7dd30d565@natalenko.name>
On Wed, 2018-02-14 at 10:55 +0100, Oleksandr Natalenko wrote:
> Hi.
>
> 14.02.2018 09:56, Paolo Valente wrote:
> > This has evidently to do with tag pressure. I've looked for a way to
> > easily reduce the number of tags online, so as to put your system in
> > the bad spot deterministically. But at no avail. Does anyone know a
> > way to do it?
>
> Isn't this a case for block device queue_depth? IIRC, the amount of tags
> is derived from it.
/sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/queue_depth
/sys/devices/pci0000:00/0000:00:1f.2/ata6/host5/target5:0:0/5:0:0:0/queue_depth
/sys/devices/pci0000:00/0000:00:1f.2/ata2/host1/target1:0:0/1:0:0:0/queue_depth
/sys/devices/pci0000:00/0000:00:1f.2/ata5/host4/target4:0:0/4:0:0:0/queue_depth
FWIW, these guys are all 31.
next prev parent reply other threads:[~2018-02-14 13:25 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-07 21:19 [PATCH BUGFIX V3] block, bfq: add requeue-request hook Paolo Valente
2018-02-07 22:18 ` Jens Axboe
2018-02-08 7:16 ` Paolo Valente
2018-02-08 7:16 ` Paolo Valente
2018-02-09 13:21 ` Oleksandr Natalenko
2018-02-09 17:17 ` Jens Axboe
2018-02-09 17:29 ` Mike Galbraith
2018-02-10 8:29 ` Oleksandr Natalenko
2018-02-10 8:29 ` Oleksandr Natalenko
2018-02-12 7:24 ` Paolo Valente
2018-02-12 7:24 ` Paolo Valente
2018-02-12 11:22 ` Mike Galbraith
2018-02-12 12:48 ` Oleksandr Natalenko
2018-02-13 5:02 ` Mike Galbraith
2018-02-13 5:46 ` Paolo Valente
2018-02-13 6:42 ` Mike Galbraith
2018-02-13 6:50 ` Mike Galbraith
2018-02-13 8:15 ` Paolo Valente
2018-02-13 14:30 ` Mike Galbraith
2018-02-14 5:58 ` Mike Galbraith
2018-02-14 7:04 ` Mike Galbraith
2018-02-14 7:15 ` Mike Galbraith
2018-02-14 8:56 ` Paolo Valente
2018-02-14 9:55 ` Oleksandr Natalenko
2018-02-14 13:25 ` Mike Galbraith [this message]
2018-02-14 15:19 ` Jens Axboe
2018-02-14 15:39 ` Paolo Valente
2018-02-14 15:44 ` Jens Axboe
2018-02-15 18:13 ` Paolo Valente
2018-02-16 5:39 ` Mike Galbraith
2018-02-16 7:16 ` Paolo Valente
2018-02-16 7:20 ` Paolo Valente
2018-02-17 5:30 ` Mike Galbraith
2018-02-17 5:33 ` Mike Galbraith
2018-02-19 5:34 ` Mike Galbraith
2018-02-19 6:05 ` Oleksandr Natalenko
2018-02-19 7:09 ` Mike Galbraith
2018-02-19 7:58 ` Mike Galbraith
2018-02-19 9:37 ` Paolo Valente
2018-02-19 13:18 ` Mike Galbraith
2018-02-17 5:39 ` Mike Galbraith
2018-02-26 19:48 ` Greg KH
2018-02-26 20:10 ` Oleksandr Natalenko
2018-02-26 20:18 ` Jens Axboe
2018-02-23 15:07 ` Ming Lei
2018-02-23 15:41 ` Paolo Valente
2018-02-23 15:41 ` Paolo Valente
2018-02-23 16:17 ` Ming Lei
2018-02-24 7:54 ` Paolo Valente
2018-02-24 7:54 ` Paolo Valente
2018-02-24 12:05 ` Ming Lei
2018-02-24 16:15 ` Paolo Valente
2018-02-24 16:15 ` Paolo Valente
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