fish:// transfer speed slow in one direction

[James Gray]

Anton Rolls wrote:
> Hi,
> 
> I've got a strange problem transferring files
> between Kubuntu Feisty machines using fish://
> in Konqueror.
> 
> When files were transferred from the client
> to the server, the transfer speed was ~1.1MB/s.
> When files were transferred the other way,
> from server to client, it went at about 8.1MB/s.
> 
> Does this ring any bells ?

The kio "fish" is painfully slow.  The problem is in the KDE code, not 
your network.  I see the same thing on a gigabit network between a pair 
of high-end machines (many cores, hardware RAID, lots of RAM):

CLIENT       SERVER    SPEED
FISH    <--> SSH       1-2Mbps
SSH/SCP <--> SSH       700-800Mbps

When using KIO handlers (specifically CIFS/SMB/FISH/SFTP) I've noticed 
the throughput really suffers compared to either dedicated clients or 
command line utilities for the same protocols.

You may notice your CPU utilisation is comparatively much higher with 
the "fish" handler compared to using scp/sftp etc.

Cheers,

James
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