Thanks Arie - I already have the following policy-maps on each router:
policy-map 40MBPS
class class-default
police 41943040 5242880 conform-action transmit exceed-action drop
Then on the L3 Ints between the POP's
service-policy input 40MBPS
service-policy output 40MBPS
Should I be shaping rather than policing?
> From: [email protected]
> To: [email protected]; [email protected]
> Subject: RE: [c-nsp] Performance issue on link
> Date: Mon, 1 Apr 2013 23:20:34 +0000
>
> You need to shape your traffic to 40Mbps (or most likely slightly less than
> that).
> TCP bursts and your provider drops the traffic, which causes the TCP window
> to shrink.
>
> Your switches cannot shape, so you would have to do it on the routers.
>
> Basically, a classic sub-rate link problem:
> http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND_40/QoSIntro_40.html#wp61026
>
> Arie
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of CiscoNSP List
> Sent: Monday, April 01, 2013 15:51
> To: [email protected]
> Subject: [c-nsp] Performance issue on link
>
> 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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