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Date: Mon, 27 Jan 2014 11:14:00 +0200
From: Konstantinos Skarlatos <k.skarlatos@gmail.com>
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To: linux-btrfs@vger.kernel.org
Subject: Btrfs send 4-5 times slower than rsync on local
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Hello, i am using btrfs send to copy a snapshot to another btrfs 
filesystem on the same machine, and it has a maximum speed of 
30-35MByte/sec.
Incredibly rsync is much faster, at 120-140MB/sec. Source btrfs is a 
5x2TB raid 0 and target is 1x4TB.

mount options: rw,noatime,compress-force=zlib,space_cache
kernel is linux-3.13.0-rc6-git and btrfs tools is built from git at 
about the same time linux-3.13.0-rc6 was released

Finally, is there a way to resume an interrupted send?