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Hi Guys,
I have a 40Mb connection between 2 POPs, and 2 Debian servers connected at each end(L2, same broadcast domain) - I am seeing consistent poor performance with TCP in only one direction. Latency between the POP's is ~67m/sec POPA->POPB UDP(IPERF) - consistent 38.5Mb/sec POPA->POPB TCP(IPERF) - fluctuates ~30Mb/sec -> 32Mb/sec POPA->POPB TCP(FTP) - fluctuates ~30Mb/sec -> 32Mb/sec POPA->POPB TCP(WGET) - fluctuates ~30Mb/sec -> 32Mb/sec POPB->POPA UDP(IPERF) - consistent 38.5Mb/sec POPB->POPA TCP(IPERF) - fluctuates ~10Mb/sec -> 15Mb/sec POPB->POPA TCP(FTP) - fluctuates ~10Mb/sec -> 15Mb/sec POPB->POPA TCP(WGET) - fluctuates ~10Mb/sec -> 15Mb/sec Both Deb boxes are running the same kernel (2.6.32-5), and I have tried adjusting tcp window without seeing any improvements...all ports are running full duplex, and Im not seeing any errors/drops, nor packet-loss on the link. Any suggestions are greatly appreciated (Provider of the link is stating it is a tcp window issue) -If that is the case, if someone can provide some suggested tweaks/changes to the Deb servers, It would be fantastic! Cheers. |