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The `--rsyncable` patch never got upstreamed, and in recent debian the feature is totally broken (rsync needs to transmit ~100% of the file again).

`pigz` has a similar flag that works reliably, though.

Are you referring to https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=708423 ? If so, it was fixed in December 2013 and doesn't affect the current Debian release (Jessie), although it does affect the previous release (Wheezy) and there is an open request to backport the fix https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=781496