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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Nenad Mihajlovic <nenad@venturis.hu>
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Cc: freebsd-questions@freebsd.org
Subject: Re: FreeBSD SAMBA file server performance - strange behaviour
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> address from the fileserver, i get performance increase in the transfer speed 
> - the bigger the traffic i generate, the better the results, which max out at 
> 25-27 MB/sec with flood ping.
>
> Has anyone else experienced any similar behaviour?
>
yes. there was (but at 100Mbit/s) autonegotiation problems, switch got 
"half duplex" while computer worked full duplex - which lead to packet 
losses. setting manually to 100Mbit/s half-duplex (on server) fixed this.

but check, it may not be your case