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

From: Christoph Hellwig
Date: Tue Jul 15 2014 - 14:55:23 EST

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
> 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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