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 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
