Messages in this thread | | | Date | Tue, 15 Jul 2014 15:26:10 -0400 (EDT) | From | Mikulas Patocka <> | Subject | Re: ANNOUNCE: SCSI XCOPY support for the kernel and device mapper |
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On Tue, 15 Jul 2014, Christoph Hellwig wrote:
> 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.
I'll post them to the lists.
> > 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?
dm-mirror resynchronization is 4 times faster with XCOPY offload, but it is just a benchmark on a network with iSCSI between two slow machines.
I hope that we get some benchmarks on a real hardware.
Mikulas
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