From: Long Li <longli@microsoft.com>
To: KY Srinivasan <kys@microsoft.com>,
        Bart Van Assche <Bart.VanAssche@sandisk.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
        "axboe@kernel.dk" <axboe@kernel.dk>
CC: Stephen Hemminger <sthemmin@microsoft.com>
Subject: RE: [PATCH] block-mq: set both block queue and hardware queue restart
 bit for restart
Thread-Topic: [PATCH] block-mq: set both block queue and hardware queue
 restart bit for restart
Thread-Index: AQHSrms40Uir2JJba0uWmbYvvI7Kv6G3faUAgAAz6xCAAAIZAIAACeWAgAAULvA=
Date: Thu, 6 Apr 2017 05:38:10 +0000
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> -----Original Message-----
> From: KY Srinivasan
> Sent: Wednesday, April 5, 2017 9:21 PM
> To: Bart Van Assche <Bart.VanAssche@sandisk.com>; linux-
> kernel@vger.kernel.org; linux-block@vger.kernel.org; Long Li
> <longli@microsoft.com>; axboe@kernel.dk
> Cc: Stephen Hemminger <sthemmin@microsoft.com>
> Subject: RE: [PATCH] block-mq: set both block queue and hardware queue
> restart bit for restart
> 
> 
> 
> > -----Original Message-----
> > From: Bart Van Assche [mailto:Bart.VanAssche@sandisk.com]
> > Sent: Wednesday, April 5, 2017 8:46 PM
> > To: linux-kernel@vger.kernel.org; linux-block@vger.kernel.org; Long Li
> > <longli@microsoft.com>; axboe@kernel.dk
> > Cc: Stephen Hemminger <sthemmin@microsoft.com>; KY Srinivasan
> > <kys@microsoft.com>
> > Subject: Re: [PATCH] block-mq: set both block queue and hardware queue
> > restart bit for restart
> >
> > On Thu, 2017-04-06 at 03:38 +0000, Long Li wrote:
> > > > -----Original Message-----
> > > > From: Bart Van Assche [mailto:Bart.VanAssche@sandisk.com]
> > > >
> > > > Please drop this patch. I'm working on a better solution.
> > >
> > > Thank you. Looking forward to your patch.
> >
> > Hello Long,
> >
> > It would help if you could share the name of the block or SCSI driver
> > with which you ran into that lockup and also if you could share the
> > name of the I/O scheduler used in your test.
> 
> The tests that indicated the issue were run Hyper-V. The driver is
> storvsc_drv.c The I/O scheduler was I think noop.

Yes, we see I/O hung on scheduler none. Also tried on mq-deadline, same hung with the same cause.

> 
> K. Y
> >
> > Thanks,
> >
> > Bart.