From: Alan Stern <stern@rowland.harvard.edu>
To: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Andrea Vai <andrea.vai@unipv.it>, Jens Axboe <axboe@kernel.dk>,
<linux-usb@vger.kernel.org>, <linux-scsi@vger.kernel.org>,
Himanshu Madhani <himanshu.madhani@cavium.com>,
Hannes Reinecke <hare@suse.com>, Ming Lei <ming.lei@redhat.com>,
Omar Sandoval <osandov@fb.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Greg KH <gregkh@linuxfoundation.org>
Subject: Re: Slow I/O on USB media after commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6
Date: Wed, 3 Jul 2019 10:23:13 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.44L0.1907031020220.1547-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <20190703072934.GA4026@x250.microfocus.com>
On Wed, 3 Jul 2019, Johannes Thumshirn wrote:
> On Wed, Jul 03, 2019 at 12:36:30AM +0200, Andrea Vai wrote:
> > On 02/07/19 13:51:17, Johannes Thumshirn wrote:
> > > On Tue, Jul 02, 2019 at 12:46:45PM +0200, Andrea Vai wrote:
> > > > Hi,
> > > > I have a problem writing data to a USB pendrive, and it seems
> > > > kernel-related. With the help of Greg an Alan (thanks) and some
> > > > bisect, I found out the offending commit being
> > > >
> > > > commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6
> > > >
> > > > [...]
> > >
> > > Hi,
> > >
> > > Can you please check what IO scheduler you have set for your USB pendrive?
> > >
> > > i.e. with:
> > > cat /sys/block/$DISK/queue/scheduler
> > >
> >
> > # cat /sys/block/sdf/queue/scheduler
> > [mq-deadline] none
>
> One thing you can try as well is building a kernel with CONFIG_IOSCHED_BFQ and
> use it. Deadline is probably not the best choice for a slow drive.
Andrea, another thing you could try is to collect a usbmon trace under
one of the "slow" kernels. Follow the instructions in
Documentation/usb/usbmon.txt. I think you could kill the file-copy
operation after just a couple of seconds; that should provide enough
trace information to help see what causes the slowdown.
(If you want, do the same test with a "fast" kernel and then we'll
compare the results.)
Alan Stern
next prev parent reply other threads:[~2019-07-03 14:23 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-02 10:46 Slow I/O on USB media after commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6 Andrea Vai
2019-07-02 11:51 ` Johannes Thumshirn
2019-07-02 22:36 ` Andrea Vai
2019-07-03 7:29 ` Johannes Thumshirn
2019-07-03 14:23 ` Alan Stern [this message]
2019-07-06 22:06 ` Andrea Vai
2019-07-08 15:38 ` Alan Stern
2019-07-02 12:01 ` Ming Lei
2019-07-02 22:39 ` Andrea Vai
2019-07-03 2:01 ` Ming Lei
2019-07-03 5:11 ` Andrea Vai
2019-07-03 6:36 ` Ming Lei
2019-07-03 15:27 ` Chris Murphy
2019-07-06 9:33 ` Andrea Vai
2019-07-08 1:01 ` Ming Lei
2019-07-09 21:18 ` Andrea Vai
2019-07-10 2:44 ` Ming Lei
[not found] <e3f87757f7a0fdf551e911ad32fc8122eebe04c7.camel@unipv.it>
2019-08-13 19:52 ` Alan Stern
[not found] <307581a490b610c3025ee80f79a465a89d68ed19.camel@unipv.it>
2019-08-20 17:13 ` Alan Stern
2019-08-23 10:39 ` Andrea Vai
2019-08-23 20:42 ` Alan Stern
2019-08-26 6:09 ` Andrea Vai
2019-08-26 16:33 ` Alan Stern
2019-09-18 15:25 ` Andrea Vai
2019-09-18 16:30 ` Alan Stern
2019-09-19 7:33 ` Andrea Vai
2019-09-19 17:54 ` Alan Stern
2019-09-20 7:25 ` Andrea Vai
2019-09-20 7:44 ` Greg KH
2019-09-19 8:26 ` Damien Le Moal
2019-09-19 8:55 ` Ming Lei
2019-09-19 9:09 ` Damien Le Moal
2019-09-19 9:21 ` Ming Lei
2019-09-19 14:01 ` Alan Stern
2019-09-19 14:14 ` Damien Le Moal
2019-09-20 7:03 ` Andrea Vai
2019-09-25 19:30 ` Alan Stern
2019-09-25 19:36 ` Jens Axboe
2019-09-27 15:47 ` Andrea Vai
2019-11-04 16:00 ` Andrea Vai
2019-11-04 18:20 ` Alan Stern
2019-11-05 11:48 ` Andrea Vai
2019-11-05 18:31 ` Alan Stern
2019-11-05 23:29 ` Jens Axboe
2019-11-06 16:03 ` Alan Stern
2019-11-06 22:13 ` Damien Le Moal
2019-11-07 7:04 ` Andrea Vai
2019-11-07 7:54 ` Damien Le Moal
2019-11-07 18:59 ` Andrea Vai
2019-11-08 8:42 ` Damien Le Moal
2019-11-08 14:33 ` Jens Axboe
2019-11-11 10:46 ` Andrea Vai
2019-11-09 10:09 ` Ming Lei
2019-11-09 22:28 ` Ming Lei
2019-11-11 10:50 ` Andrea Vai
2019-11-11 11:05 ` Ming Lei
2019-11-11 11:13 ` Andrea Vai
2019-11-22 19:16 ` Andrea Vai
2019-11-23 7:28 ` Ming Lei
2019-11-23 15:44 ` Andrea Vai
2019-11-25 3:54 ` Ming Lei
2019-11-25 10:11 ` Andrea Vai
2019-11-25 10:29 ` Ming Lei
2019-11-25 14:58 ` Andrea Vai
2019-11-25 15:15 ` Ming Lei
2019-11-25 18:51 ` Andrea Vai
2019-11-26 2:32 ` Ming Lei
2019-11-26 7:46 ` Andrea Vai
2019-11-26 9:15 ` Ming Lei
2019-11-26 10:24 ` Ming Lei
2019-11-26 11:14 ` Andrea Vai
2019-11-27 2:05 ` Ming Lei
2019-11-27 9:39 ` Andrea Vai
2019-11-27 13:08 ` Ming Lei
2019-11-27 15:01 ` Andrea Vai
2019-11-27 0:21 ` Finn Thain
2019-11-28 17:10 ` Andrea Vai
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