RELENG_8 ignoring TCP window size? [Was: Re: Help for TCP understanding wanted, ACK-MSS-Window [Was: Re: best practice to watch TCP parms of established sockets]]

[Harald Schmalzbauer]

Adam Vande More schrieb am 18.02.2010 17:28 (localtime):
> On Thu, Feb 18, 2010 at 10:24 AM, Harald Schmalzbauer 
> <h.schmalzbauer at omnilan.de <mailto:h.schmalzbauer at omnilan.de>> wrote:
> 
>     The problem is not with the windows box, these transfer rates are
>     sensible. The problem is with two RELENG_8 machines.
> 
>     I'm doing this whole thing because I observed slowdowns under 20MB/s
>     and I try to reproduce and investigate this. But first I have to get
>     the idea right... If I don't understamd things going on when
>     transfers make sense, I won't be able to determine what happens when
>     transfers are slowed down...
> 
> 
> Have you considered the possibility it's not a tcp issue at all, maybe a 
> nic driver?

I did, but then the transfers to the windows box were also affected I guess.

And to answer the iperf wondering of Patrick:

------------------------------------------------------------
Client connecting to banana, TCP port 2121
TCP window size: 4.00 MByte (default)
------------------------------------------------------------
[  3] local 192.168.147.249 port 65230 connected with 192.168.147.11 
port 2121
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  1.07 GBytes    918 Mbits/sec

Though I have no idea what this tells me. Never used iperf before...

Thanks,

-Harry

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