[c-nsp] Performance issue on link

[Azher Mughal]

These might be helpful:

http://fasterdata.es.net/network-tuning/

http://www.mellanox.com/related-docs/prod_software/Performance_Tuning_Guide_for_Mellanox_Network_Adapters.pdf

-Azher

On 4/1/2013 3:51 PM, CiscoNSP List wrote:
> Hi,
>
> We have a 40Mb link between 2 POPs - Latency ~65m/sec (No packet-loss)
>
> POP A Is a 7301 and 2960POP B is a 7200 and 4948
>
> 40Mb link is connected to the two switches (L2), and then a trunk link to both routers for all L3.
>
> Have a Linux server connected to both switches, and achieve the following performance:
>
> IPERF (UDP)
> POP A -> POP B - 38.5Mb/secPOP B -> POP A - 38.5Mb/sec
>
> IPERF (TCP)
> POP A -> POP B - ~20Mb/secPOP B -> POP A - ~12Mb/sec
>
> FTP
> POP A -> POP B - ~38Mb/secPOP B -> POP A - ~16Mb/sec
>
> WGET
> POP A -> POP B - ~30Mb/sec POP B -> POP A - ~16Mb/sec
>
> Any suggestions on why I am seeing poor performance with TCP transfers? (Especially POP B -> POP A direction) - I've tried adjusting the window size in IPERF but it actually made the results worse?
> Thanks in advance.
>
>
>
>   		 	   		
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