[c-nsp] asymmetrical performance inside core

[Tim Densmore]

Stab in the dark, but have you verified you don't have a duplex mismatch 
anywhere?  IME, they can look exactly like that.


On 10/1/2012 5:03 PM, Eric A Louie wrote:
> I'm inheriting a problem that I could use some ideas to troubleshoot.
>
> Speedtesting from within my core to other locations within the core give me
> "asymmetrical" performance. I've traced the routes and the path is the same
> download and upload, but I'll get very good download speeds (30Mbps) and
> terrible upload speeds (3Mbps, 6Mbps)
>
> I've looked at MTU and it doesn't appear that there's a lot of packet
> fragmentation/reassembly
>
> I've looked at total bandwidth utilization during the test times across the
> backhaul and I'm not saturating the bandwidth in either direction
>
> I've looked at the interfaces through which the packets are traveling, and there
> are no CRC errors, no drops, no retransmissions
>
> The physical layer radio transmissions seem to be good both directions with the
> performance testing at that level.
>
> What do I look at next?  It's a problem because customers are speedtesting and
> seeing this DSL-like performance and making noises.
>
>   Much appreciated,
> Eric Louie
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