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From: yangxingui <yangxingui@huawei.com>
To: <axboe@kernel.dk>, John Garry <john.g.garry@oracle.com>
Cc: <linux-block@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<James.Bottomley@HansenPartnership.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	<damien.lemoal@opensource.wdc.com>
Subject: [bug report] block: Non-NCQ commands will never be executed while fio is continuously running
Date: Mon, 9 Sep 2024 21:10:14 +0800	[thread overview]
Message-ID: <eef1e927-c9b2-c61d-7f48-92e65d8b0418@huawei.com> (raw)

Hello axboe & John,

After the driver exposes all HW queues to the block layer, non-NCQ 
commands will never be executed while fio is continuously running, such 
as a smartctl command.

The cause of the problem is that other hctx used by the NCQ command is 
still active and can continue to issue NCQ commands to the sata disk.
And the pio command keeps retrying in its corresponding hctx because 
qc_defer() always returns true.

hctx0: ncq, pio, ncq
hctx1：ncq, ncq, ...
...
hctxn: ncq, ncq, ...

Is there any good solution for this?

Thanks.
Xingui

             reply	other threads:[~2024-09-09 13:10 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-09-09 13:10 yangxingui [this message]
2024-09-09 13:21 ` Damien Le Moal
2024-09-10  1:09   ` yangxingui
2024-09-10  4:45     ` Damien Le Moal
2024-09-10  6:34       ` yangxingui
2024-09-10 11:27         ` Niklas Cassel
2024-09-10 22:38           ` Damien Le Moal
2024-09-11  9:41             ` yangxingui
2024-09-19 12:26             ` Yu Kuai
2024-09-19 14:14               ` Damien Le Moal
2024-10-31 14:12                 ` Niklas Cassel
2024-11-01  2:17                   ` yangxingui

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