[Samba] missing tcp-ack in samba transfers

[Peter Menzebach]

Hi,
I am not shure if I am correct on this list, but maybe someone can give 
me a pointer...

We are running an samba server (3.0.10) on linux (2.6.12.5). Wenn we 
copy a file from a workstation to the server, we have *very* bad 
throughput, since we have tcp retransmissions.
These retransmissions are causes by a missing tcp-ack, which is not sent 
by the linux server.

This happens occasionally but if, then it happens every time at the last 
tcp packet of an "Write andX Request" (total about 60k bytes in 40 tcp 
packets). Here the ack for the last tcp packet is not sent by the 
server. I cannot see the ack with ethereal. So, it is lost in the 
server, not on the network...

The problem exists, since we upgraded to gigabit ethernet and happens 
only, if the file is sent from a machine, which has gigabit ethernet 
too. I cannot see such a problem, if I use ftp.

I hope, someone can give me a pointer...

Best regards
Peter