linux-kernel - Re: ANNOUNCE: SCSI XCOPY support for the kernel and device mapper

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Message-ID: <20140715185513.GA5331@infradead.org>
Date:	Tue, 15 Jul 2014 11:55:13 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	"Alasdair G. Kergon" <agk@...hat.com>,
	Mike Snitzer <msnitzer@...hat.com>,
	Jonathan Brassow <jbrassow@...hat.com>,
	Edward Thornber <thornber@...hat.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Jens Axboe <axboe@...nel.dk>, dm-devel@...hat.com,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: ANNOUNCE: SCSI XCOPY support for the kernel and device mapper

On Tue, Jul 15, 2014 at 02:33:13PM -0400, Mikulas Patocka wrote:
> Hi
> 
> I annouce that I released the first version of a patch set that makes it 
> possible to use SCSI XCOPY offload for the block layer and device mapper.
> 
> The patchset is at 
> http://people.redhat.com/~mpatocka/patches/kernel/xcopy/series.html It 
> requires kernel version at least 3.16-rc4. It was tested on target-core 
> iSCSI implementation.

Can you send the series to the mainling list(s)?  That makes it a lot
easier to do a quick review.

> The dm-kcopyd subsystem is modified to use the XCOPY command, so device 
> mapper targets that use it (mirror, snapshot, thin, cache) take advantage 
> of copy offload automatically.

That sounds good, do you have any benchmarking data that shows the
advantage of using XCOPY?

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