Cygwin Rsync/SSH performance issue

Christopher Faylor
Tue Feb 16 16:08:00 GMT 2010

On Tue, Feb 16, 2010 at 04:45:38PM +0100, Jan Alphenaar wrote:
>Hi again,
>I did some more testing on this and figured out that rsync/ssh is only
>taking the full cpu if the bandwidth allocated to the session exceeds the
>true bandwidth available on the link.
>For example, if the uplink is 128KB/s and I pass in the --bwlimit=24
>parameter the cpu is around 0%. Even --bw-limit=126 does not take 100% cpu,
>but --bwlimit=132 does.
>Would this be because of packet loss on the link and packets have to be
>retransmitted ? I will do a quick test tonight with rsync/ssh between two
>linux boxes, see what that gives me.

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