linux-kernel - Re: [PATCH v6] NVMe: conversion to blk-mq

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Message-ID: <20140609145944.GA30626@infradead.org>
Date:	Mon, 9 Jun 2014 07:59:44 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Jens Axboe <axboe@...com>
Cc:	Ming Lei <tom.leiming@...il.com>, Matias Bj??rling <m@...rling.me>,
	willy@...ux.intel.com, keith.busch@...el.com, sbradshaw@...ron.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-nvme@...ts.infradead.org
Subject: Re: [PATCH v6] NVMe: conversion to blk-mq

On Mon, Jun 09, 2014 at 08:08:50AM -0600, Jens Axboe wrote:
> >[  487.704074] nvme 0000:00:07.0: Cancelling I/O 202 QID 1
> >[  487.717881] nvme 0000:00:07.0: Aborting I/O 202 QID 1
> >[  487.736093] end_request: I/O error, dev nvme0n1, sector 91532352
> >[  487.747378] nvme 0000:00:07.0: completed id 0 twice on queue 0
> >
> >
> >when running fio randread(libaio, iodepth:64) with more than 3 jobs.
> >
> >And looks no such failure when jobs is 1 or 2.
> 
> It's a known issue, make sure you have this patch:
> 
> http://git.kernel.dk/?p=linux-block.git;a=commit;h=f6be4fb4bcb396fc3b1c134b7863351972de081f

So without this patch we can get duplicate completions?  That could
explain the issues that Robert sees with scsi-mq and hpsa..

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