[dm-devel] ANNOUNCE: SCSI XCOPY support for the kernel and device mapper

Christoph Hellwig hch at infradead.org
Tue Jul 15 18:55:13 UTC 2014

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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