[Samba] Weird behaviour concerning send-speed (Debian Etch, Samba from official deb)

Michael Biech MichaelBiech at web.de
Mon May 5 12:41:25 GMT 2008


I'm experiencing a very annoying and strange behaviour with Samba since quite 
some time (I guess like 2 months now or so): When I write to a share speeds 
are quite excellent with up to 60 Mbyte/sec, however when I want to read 
speeds are under a megabyte per second, mostly even below 300 kb/s which is 
rather unacceptable in my opinion.

I went through the "usual suspects" - I did a purge and reinstall, starting 
out with a minimal smb.conf, played around with the send and receive buffer, 
nothing helped.

Well, now for the (in my opinion) really weird part: When I put load on my CPU 
(e.g. via a simple python "while True: pass") the sending speed goes up to 
about 20 Mb/sec. As soon as I kill the load-generating process the speed 
instantly drops to the mentioned ~300 kb/s.

Other protocols (http, ftp) don't show this behaviour. Any possible help is 
greatly appreciated!


Michael Biech, http://tikurion.net
OpenPGP-Key: http://tikurion.net/MichaelBiech.asc
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