Another thing to keep in mind is that the local client will always dump the RWIN at line rate. So you could need to increase the default shape queue size up to possibly that large if there is a significant speed difference between the initial wire link to the device, and your WAN circuit, like example a gigabit LAN.
-Blake On Tue, Apr 2, 2013 at 11:32 AM, Arie Vayner (avayner) <[email protected]>wrote: > +1. Sometimes the shaper does not match with the rate limiting the service > provider uses on the link. > Reduce the shaper to substantially lower value (35M would be a good start, > but maybe even 30M just to make sure). > > If you see performance go up and work correctly at the shaped rate, start > increasing the shaper until you hit the value that reduces performance. > > You shaper rate has to be lower than the service policy the service > provider is enforcing to avoid traffic drops on the circuit. > > Arie > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of Mikael Abrahamsson > Sent: Monday, April 01, 2013 20:38 > To: CiscoNSP List > Cc: [email protected] > Subject: Re: [c-nsp] Performance issue on link > > On Tue, 2 Apr 2013, CiscoNSP List wrote: > > > class-map match-any MATCH_ANY match any > > > > policy-map 40MB_SHAPE > > class MATCH_ANY > > shape average 41943040 > > Try lowering this to 35 megabit/s to make sure you avoid the policer your > provider has in place. > > When you do the tcp testing, do a packet capture on the servers and look > for packet loss. Wireshark has excellent TCP analysis tools that can show > you exactly what's going on, if the problem is maxed out TCP windows or if > it's caused by TCP saw-toothing due to packet loss. > > -- > Mikael Abrahamsson email: [email protected] > _______________________________________________ > 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/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
