rsync speed limited by read chunk size?

Wayne Davison wayned at
Fri Jul 12 11:35:15 MDT 2013

On Tue, Jul 9, 2013 at 9:46 AM, CM Fields <cmfileds at> wrote:

> Is rsync speed limited to 160MB/sec read speeds due to the chunk
> read size? Or, are we seeing just a coincidence and the limitation
> is somewhere else?

The fileio routines are usually reading 256K chunks except for the
receiver, which tries to read 16K chunks (since it may be randomly
accessing the file data in some cases).

Give the 3.1.0dev code a try -- it aligns its reads on 1K boundaries.  That
might help the speed.  It also has better I/O throughput between processes.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the rsync mailing list