[rdiff-backup-users] How to speed up rdiff-backup

[Carsten Lorenz]

I started the first backup to an empty directory on a second server.
I'm wandering about the low speed of ca. 1.6MB/s

Both servers are DL380 with dual PIII 833MHz running debian, python2.3,
librsync 0.9.7-1 and rdiff-backup 1.0.0-0.cvs20050819 (thanks to Dean
Gaudet for the debian package).
They are directly connected by gigabit.

I started rdiff-backup this way:
rdiff-backup -v5 --terminal-verbosity=4 --ssh-no-compression /mnt/files/ 
192.168.0.1::/mnt/raid/backup/fileserver2/

Everything looks fine:
CPU-usage on the source-server is ca.15% for ssh and ca. 6% for rdiff-backup
CPU-usage on the destination is ca. 18% for sshd and ca. 12% for rdiff-backup
No swap-space is used.

rdiff-backup needs 132s to transfer a 140MB file (1.1MB/s).
While rdiff-backup works on the next file scp transfers the same file in 15s 
(9.3MB/s)!

Since we want to backup one tera-byte of data this would last more than a week.

Has anyone hints how to speedup rdiff-backup?

Carsten