checksum feature request

Paul Slootman paul+rsync at
Thu Oct 3 13:43:30 UTC 2019

On Tue 01 Oct 2019, Bill Wichser via rsync wrote:
> Attached is the patch we applied.  Since xxhash is in the distro, a
> dependency would be required for this RPM.  If nothing else, perhaps the
> developers should just take a look as this could benefit many.

"The distro" is a bit vague for a tool like rsync that runs on many
versions of Unix and linux, and even windows.

The problem is (AFAIK) that this would need a protocol version bump so
that the checksum algorithm to be used can be decided upon by both ends
of the transfer, it's not as simple as simply replacing the current
algorithm: that would make it impossible to rsync to / from an older
version of rsync.

It's an interesting idea, although I wonder how many users would
actually profit from this. CPU is generally fast enough to handle what
the IO subsystem can read for most people, I imagine.


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