Optimizing a high-latency connection

[Petri Helenius]

Increase sendspace an recvspace depending which way your data is going:
net.inet.tcp.sendspace: 57344
net.inet.tcp.recvspace: 256000

TCP window scaling is enabled by default nowadays if I remember correctly.

Pete


Morgan wrote:
> Hi.
>
> I'm trying som file transfers across the globe. The RTT is almost 400ms and
> the transfer rate is painfully slow. There are 24 router hops on the path
> and I assume most of the problem is there but I wonder if there are any
> sysctl variables I can trim on my side to help this problem slightly? I seem
> to understand that there need to be an ACK received for at least every other
> packet or at least every 100ms for the data flow to proceed uninterrupted
> but I'm no expert in this field so please correct me if I'm wrong. Assuming
> this IS correct, are there any sysctl variables I can optimize to change
> this behaviour or will that affect low latency connections negatively. Any
> other suggestions?
>
> Regards
> Morgan
>
>
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