Herbert Graeber wrote:
Am Dienstag 18 Mai 2010, 15:59:21 schrieb Boris Epstein:
Hello everyone,
Something very curious has just been discovered here.
We have a machine running SSH/SFTP server (a Windows XP machine if that matters). The network is a mix of 100 Mbit and 1000 Mbit ports (12.5 and 125 MB/s, respectively). When we use command-line sftp to transfer files we get decent speed (from 7 MB/s and upwards). When we use graphical interfaces on either OpenSuSE or Ubuntu (and it is the same whether it is Konqueror or Dolphin) the transfer speed drops down to no more than 2 MB/s and sometimes even to 500 KB/s. Any idea why?
Dolpin and konqueror use kio_sftp to use the sftp protocol. kio_sftp uses the libssh library. It's likely that it is a problem of this library, which isn't part of KDE.
Herbert
I believe it is a kio throughput performance issue. The following comments are more specific to smb transfers to/from Samba servers, but serve to illustrate. Quite a while back I still had a partition with my trusty old KDE 3.5.10 install present as a fallback from KDE 4.x.x. (This is no longer the case.) With the old 100Mb/s ethernet I averaged somewhere between 6-7 MB/s during smb file transfers using Konqueror in file manager mode. Perfectly nominal. I then changed my NICs and switch to 1Gb/s. On the old KDE 3.5.10 the average run of the mill was about 24MB/s throughput on file transfers. I immediately noticed very early on that the 4.x.x install averaged somewhere around 16MB/s and was lucky if it every once in a while hit 18MB/s. Could not ever get it any faster than this. Reboot back to the 3.5.10 install and it would go right back to 24MB/s. I should probably add that I have seen this identical behavior on both FreeBSD and Linux. These numbers are from a small home network using servers which do not have the throughput capabilities of real server hardware. But the delta between KDE 3.5.10 and KDE 4.x.x was real and reproducible. This speed difference between KDE 3.5.10 and KDE 4.x.x was very well defined and completely repeatable by simply booting between KDE versions. Never really tried to do anything about it and was hoping that at some point in the future others with more techn-fu would notice, complain about it, and maybe it would eventually get looked at. I'm not holding my breath, as KDE 4.x.x has been out how long now and nobody seems interested. -Mike -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org