Yes, you should be shaping on egress. Why are you policing on ingress?! Arie
Sent via my mobile phone. -------- Original message -------- From: CiscoNSP List <[email protected]> Date: To: "Arie Vayner (avayner)" <[email protected]>,[email protected] 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: [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. > > > > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
