Re: Slow I/O on USB media after commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6

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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.

Byte,
	Johannes
-- 
Johannes Thumshirn                            SUSE Labs Filesystems
jthumshirn@xxxxxxx                                +49 911 74053 689
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