[rdiff-backup-users] Newbie bumbler rdiff-bkp horribly horribly slow

[Harry Putnam]

I'm a first time user of rdiff-backup and just went by the early
documentation far as cmds go... to run an experiment.

I used the format:
  rdiff-backup address@hidden::/remote-dir local-dir

remotehost was winXP
localhost was Opensolaris (zfs filesystem)

Ended up copying 23 GB... but the nasty thing is, it took a whopping
6+ hrs... from the session-stats log:
  ElapsedTime 21751.67 (6 hours 2 minutes 31.67 seconds)

I'm pretty sure this is not the expected outcome.  In the session
error log I see only error messages indicating certain files were
busy.

Full session stats are printed at the end... but what is likely to
cause such a massive amount of time to rdiff-backup a relatively small
amount of data?

=======================================
session-statistics:
StartTime 1247124026.00 (Thu Jul  9 02:20:26 2009)
EndTime 1247145777.67 (Thu Jul  9 08:22:57 2009)
ElapsedTime 21751.67 (6 hours 2 minutes 31.67 seconds)
SourceFiles 183611
SourceFileSize 32252284604 (30.0 GB)
MirrorFiles 1
MirrorFileSize 0 (0 bytes)
NewFiles 183610
NewFileSize 32252284604 (30.0 GB)
DeletedFiles 0
DeletedFileSize 0 (0 bytes)
ChangedFiles 1
ChangedSourceSize 0 (0 bytes)
ChangedMirrorSize 0 (0 bytes)
IncrementFiles 0
IncrementFileSize 0 (0 bytes)
TotalDestinationSizeChange 32252284604 (30.0 GB)
Errors 24