linux-kernel - Re: reeze while write on external usb 3.0 hard disk [Bug 204095]

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Message-ID: <20190820163722.GA2991@lazy.lzy>
Date:   Tue, 20 Aug 2019 18:37:22 +0200
From:   Piergiorgio Sartor <piergiorgio.sartor@...go.de>
To:     Christoph Hellwig <hch@....de>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Piergiorgio Sartor <piergiorgio.sartor@...go.de>,
        Jens Axboe <axboe@...nel.dk>,
        USB list <linux-usb@...r.kernel.org>,
        linux-block@...r.kernel.org,
        Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: reeze while write on external usb 3.0 hard disk [Bug 204095]

On Tue, Aug 20, 2019 at 09:23:26AM +0200, Christoph Hellwig wrote:
> On Mon, Aug 19, 2019 at 10:14:25AM -0400, Alan Stern wrote:
> > Let's bring this to the attention of some more people.
> > 
> > It looks like the bug that was supposed to be fixed by commit
> > d74ffae8b8dd ("usb-storage: Add a limitation for
> > blk_queue_max_hw_sectors()"), which is part of 5.2.5, but apparently
> > the bug still occurs.
> 
> Piergiorgio,
> 
> can you dump the content of max_hw_sectors_kb file for your USB storage
> device and send that to this thread?

Hi all,

for both kernels, 5.1.20 (working) and 5.2.8 (not working),
the content of /sys/dev/x:y/queue/max_hw_sectors_kb is 512
for USB storage devices (2.0 and 3.0).

This is for the PC showing the issue.

In an other PC, which does not show the issus at the moment,
the values are 120, for USB2.0, and 256, for USB3.0.

bye,

-- 

piergiorgio