[c-nsp] Performance issue on link

[Arie Vayner (avayner)]

Yes, you should be shaping on egress.
Why are you policing on ingress?!

Arie


Sent via my mobile phone.



-------- Original message --------
From: CiscoNSP List <cisconsp_list at hotmail.com>
Date:
To: "Arie Vayner (avayner)" <avayner at cisco.com>,cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] Performance issue on link


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: avayner at cisco.com
> To: cisconsp_list at hotmail.com; cisco-nsp at puck.nether.net
> 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: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of CiscoNSP List
> Sent: Monday, April 01, 2013 15:51
> To: cisco-nsp at puck.nether.net
> 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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