[dm-devel] [PATCH] dm-kcopyd/dm-snap: Don't read the origin on full chunk write
Joe Thornber
thornber at redhat.com
Mon Jun 20 08:09:53 UTC 2011
On Fri, Jun 17, 2011 at 08:32:36AM -0400, Mikulas Patocka wrote:
> Hi
>
> This optimizes full chunk writes for snapshots.
>
> Note that there is a performance bug in device mapper that it doesn't ever
> send bios larger than 4k to snapshots. So this patch optimizes only 4k
> chunk sizes. Once the 4k limit will be removed from device mapper, this
> patch could optimize any chunk size.
Nack. If you don't need to copy, don't send it to kcopyd.
- Joe
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