recent discussion regarding 'checksums'

Kyle Lanclos lanclos at
Wed Sep 29 07:35:38 MDT 2010

Jason Haar wrote:
> Besides all this, what is the performance impact of "-c"? If it's moved
> from MD5 to XXXXX - will that impact performance?

The major impact of using checksums is that both the client and the server
now need to read out every file inspected by the rsync session, where before
they could get away with only inspecting file metadata before initiating a
transfer. The delay due to I/O wait is going to be orders of magnitude higher
than any reasonable hash computation.


More information about the rsync mailing list