Actually, it's quite possible to have 400 in one direction and 60 in the other. As an example, if you assume a 1 Gbps link with 20ms RTT, a receiver using a 1 MB receive window might see between 300-400 Mbps, whereas a receiver stuck with a 64 KB receive window on the same link might see only 20 Mbps. It's pretty common, especially if one side is an older OS.
John On Fri, Nov 21, 2014 at 10:46 AM, Payam Chychi <pchy...@gmail.com> wrote: > Hi Johan, > > This sounds like a network issue, i'm actually dealing with the same thing > with one of my off-net providers. > > Latency does of course play a factor however, latency has a bidirectional > influence and not asymmetric (as in 200ms rtr both ways). > No reason as to why you should be getting 400 one way and 60 the other. > > Only thing comes to mind is different paths the packets may travel, > hitting a congestion/problem point. > > You should grant your provider a maintenance window to take down your > circuit and do an end to end throughput test and make sure they provide you > with the results. > If they can get 1:1 capacity then look at your optics, interfaces, any > bundled links, and switch/routing fabric at both ends. > > Cheers > Payam > > > > > On 2014-11-19, 1:18 PM, Johan Borch wrote: > >> Hi! >> >> >> I'm doing some performance troubleshooting between two linux systems, the >> servers are located in each end of an L3VPN, with a bunch of routers >> between them. >> >> Using Iperf and UDP I get ~1Gbps in both directions >> Using iperf and TCP i get ~400Mbps in one direction and ~60Mbps in the >> other direction >> >> Could this still be a network problem or should I dig on the linux side? >> >> Johan >> _______________________________________________ >> juniper-nsp mailing list juniper-nsp@puck.nether.net >> https://puck.nether.net/mailman/listinfo/juniper-nsp >> > > _______________________________________________ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp > _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp