Arch Linux

SpookyET

Member

Registered: 2008-01-27

Posts: 410

Rsync + SSH = SLOW

Have any of you wondered why rsync via ssh is slow as hell? It's not just rsync, but anything based on the rsync algorighm (rdiff-backup, for example) is very slow. I get 1.5-2MiB/s when I use rsync via ssh. If I use rsync via the rsync daemon, I get around 8MiB/s, which similar to samba.

However, scp, which uses ssh tunneling as well is fast. I get 8MiB/s when I use scp.  What is wrong with the rsync algorighm that makes SSH so bloody slow. scp proves that it's not ssh that is the problem.

Last edited by SpookyET (2008-05-09 20:17:59)

japetto

Member

From: Chicago, IL US

Registered: 2006-07-02

Posts: 183

Re: Rsync + SSH = SLOW

Rsync is meant to speed up transfers when some duplicate files exist between host and destination.  When just transferring files, scp will always be faster.