rsync speed limited by read chunk size?

AZ 9901 az9901 at
Sat Jul 13 06:42:07 MDT 2013

Le 12 juil. 2013 à 19:35, Wayne Davison <wayned at> a écrit :

> 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.

Hi Wayne,

Why don't you choose 4K boundaries alignment, as new hard drives now come with 4K physical blocks ?
It would also be still compatible with disks using 512B blocks (4096/512=8).

Thank you !

Best regards,

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