[c-nsp] Performance issue on link

[CiscoNSP List]

Thanks - Ill check them out now

> Date: Mon, 1 Apr 2013 16:16:36 -0700
> From: azher at hep.caltech.edu
> To: cisconsp_list at hotmail.com
> CC: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Performance issue on link
> 
> 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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>