[j-nsp] TCP

[Payam Chychi]

Hi Johan,

This sounds like a network issue, i'm actually dealing with the same 
thing with one of my off-net providers.

Latency does of course play a factor however, latency has a 
bidirectional influence and not asymmetric (as in 200ms rtr both ways).
No reason as to why you should be getting 400 one way and 60 the other.

Only thing comes to mind is different paths the packets may travel, 
hitting a congestion/problem point.

You should grant your provider a maintenance window to take down your 
circuit and do an end to end throughput test and make sure they provide 
you with the results.
If they can get 1:1 capacity then look at your optics, interfaces, any 
bundled links, and switch/routing fabric at both ends.

Cheers
Payam



On 2014-11-19, 1:18 PM, Johan Borch wrote:
> Hi!
>
>
> I'm doing some performance troubleshooting between two linux systems, the
> servers are located in each end of an L3VPN, with a bunch of routers
> between them.
>
> Using Iperf and UDP I get ~1Gbps in both directions
> Using iperf and TCP i get ~400Mbps in one direction and ~60Mbps in the
> other direction
>
> Could this still be a network problem or should I dig on the linux side?
>
> Johan
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