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

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Message-ID: <20191125035437.GA3806@ming.t460p>
Date:   Mon, 25 Nov 2019 11:54:37 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Andrea Vai <andrea.vai@...pv.it>
Cc:     Damien Le Moal <Damien.LeMoal@....com>,
        Alan Stern <stern@...land.harvard.edu>,
        Jens Axboe <axboe@...nel.dk>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        USB list <linux-usb@...r.kernel.org>,
        SCSI development list <linux-scsi@...r.kernel.org>,
        Himanshu Madhani <himanshu.madhani@...ium.com>,
        Hannes Reinecke <hare@...e.com>,
        Omar Sandoval <osandov@...com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Hans Holmberg <Hans.Holmberg@....com>,
        Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Slow I/O on USB media after commit
 f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6

On Sat, Nov 23, 2019 at 04:44:55PM +0100, Andrea Vai wrote:
> Il giorno sab, 23/11/2019 alle 15.28 +0800, Ming Lei ha scritto:
> > 
> > Please post the log of 'lsusb -v', and I will try to make a patch
> > for
> > addressing the issue.
> 
> attached,

Please apply the attached patch, and re-build & install & reboot kernel.

This time, please don't switch io scheduler.

Thanks,
Ming

View attachment "usb.patch" of type "text/plain" (3520 bytes)