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.
