Re: can I rsync on UDP?

On Tue, 21 Oct 2008 22:47:56 GMT, Unruh <unruh-spam@xxxxxxxxxxxxxx> wrote:
Allen Kistler <ackistler@xxxxxxxxx> writes:

Unruh wrote:
Joe Pfeiffer <pfeiffer@xxxxxxxxxxx> writes:

FWIW, I've found that rsync over ssh over a 1 Gbit link has a bottleneck
at the platter, not the cpu. Of course, that's with
electrically-connected drives (SAS, SATA).

It depends on the computer. I ran tests with a SATA drive on a 2GH machine
and Gb ethernet, and it was ssh that was the bottleneck. With a faster
machine
it is possible that disk access would be the bottleneck. ( If I ran rsync
straight-- ie rsync->rsync daemon which does not go through ssh) I got
about 50-80% higher throughput.

As another data point, when I've compared sending a large file (e.g.
knoppix iso image) via rsync/ssh and netcat, netcat usually took half
as long. That was done on pata/sata attached drives in my office on
either 100M or gig ethernet.


Mike

--
Michael Zawrotny
Institute of Molecular Biophysics
Florida State University | email: zawrotny@xxxxxxxxxx
Tallahassee, FL 32306-4380 | phone: (850) 644-0069
.

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