From mboxrd@z Thu Jan  1 00:00:00 1970
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Subject: Re: [PATCH 03/17] ps3disk: convert to blk-mq
To: Geoff Levand <geoff@infradead.org>, linux-block@vger.kernel.org
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
 Geert Uytterhoeven <geert@linux-m68k.org>
References: <20181011165909.32615-1-axboe@kernel.dk>
 <20181011165909.32615-4-axboe@kernel.dk>
 <17539e5f-742b-796e-8e36-31327120f883@infradead.org>
 <ee11f577-5766-13bc-2ff5-e3d672041462@kernel.dk>
 <7f27a68f-9cbe-c4c2-5c35-70763a5b1484@infradead.org>
 <b95e3ebf-f08d-2cbf-3f82-89424d7bf60d@kernel.dk>
 <3403ae47-1aaa-9d01-817c-cd52a7daa272@infradead.org>
From: Jens Axboe <axboe@kernel.dk>
Message-ID: <ef7c0fb3-a31f-68e3-25f6-478958c08602@kernel.dk>
Date: Mon, 15 Oct 2018 12:38:21 -0600
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On 10/15/18 12:23 PM, Geoff Levand wrote:
> Hi Jens,
> 
> On 10/15/2018 09:27 AM, Jens Axboe wrote:> Can you try and change the queue depth to 1 instead of 2? It's set in> the tag_set, as ->queue_depth.
> 
> With this change:
> 
> -       set->queue_depth = 2;
> +       set->queue_depth = 1;
> 
> Something is still wrong.  It can sometimes boot, sometimes udevd hangs
> up on /sbin/blkid.  If it boots I can sometimes mount a ps3disk
> partition, but then cat or echo to a file will hang.  Other times the
> mount command will hang. I saw this error appear in the system log:

Weird, it looks like we're waiting for something to complete, and then
we have a few others waiting for queue new IO.

Can you try and move the blk_mq_end_request() inside the priv->lock
section and see if that helps?

-- 
Jens Axboe