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From: keith.busch@intel.com (Keith Busch)
Subject: [PATCH] NVMe: Skip namespaces with interleaved meta-data
Date: Wed, 28 Jan 2015 22:17:21 +0000 (UTC)	[thread overview]
Message-ID: <alpine.LNX.2.00.1501282210070.15481@localhost.lm.intel.com> (raw)
In-Reply-To: <yq1iofqimmu.fsf@sermon.lab.mkp.net>

On Wed, 28 Jan 2015, Martin K. Petersen wrote:
>>>>>> "Paul" == Paul Grabinar <paul.grabinar at ranbarg.com> writes:
>
> Paul> What happens if you switch on and off meta-data dynamically with
> Paul> /sys/block/<bdev>/integrity/write_generate and
> Paul> /sys/block/<bdev>/integrity/read_verify?
>
> I think the best way to go about dealing with all this is to set PRACT=1
> if no bip is attached to a bio bound for a name space formatted with PI.

That's an option for a subset of formats I eluded to before. It will
have the controller generate/strip if the metadata size 8 bytes with
DPS settings, but ignored otherwise. We still need a buffer if metadata
is not used for PI, or if the metadata size more than 8 bytes.

  reply	other threads:[~2015-01-28 22:17 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-27 18:07 [PATCH] NVMe: Skip namespaces with interleaved meta-data Keith Busch
2015-01-27 21:57 ` David Darrington
2015-01-27 22:09   ` Keith Busch
2015-01-28  1:21     ` Keith Busch
2015-01-28  1:39       ` Martin K. Petersen
2015-01-28 15:11         ` Keith Busch
2015-01-28 20:50           ` Paul Grabinar
2015-01-28 21:16             ` Keith Busch
2015-01-28 21:46               ` Paul Grabinar
2015-01-28 22:08                 ` Martin K. Petersen
2015-01-28 22:17                   ` Keith Busch [this message]
2015-01-28 22:28                     ` Martin K. Petersen
2015-01-29  0:09                       ` Keith Busch
2015-01-29  0:57                         ` Martin K. Petersen
2015-01-29 15:44                           ` Keith Busch
2015-01-30  0:41                             ` Martin K. Petersen
2015-01-30  0:57                               ` Keith Busch
2015-01-28 22:17           ` Andrey Kuzmin

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