for what it's worth, the original newreno work tcp does not have the mtu bug. on a 8 processor system i have around here i get
bwc; while() nettest -a 127.1 tcp!127.0.0.1!40357 count 100000; 819200000 bytes in 1.505948 s @ 519 MB/s (0ms) tcp!127.0.0.1!47983 count 100000; 819200000 bytes in 1.377984 s @ 567 MB/s (0ms) tcp!127.0.0.1!53197 count 100000; 819200000 bytes in 1.299967 s @ 601 MB/s (0ms) tcp!127.0.0.1!61569 count 100000; 819200000 bytes in 1.418073 s @ 551 MB/s (0ms) however, after fixing things so the initial cwind isn't hosed, i get a little better story: bwc; while() nettest -a 127.1 tcp!127.0.0.1!54261 count 100000; 819200000 bytes in .5947659 s @ 1.31e+03 MB/s (0ms) boo yah! not bad for trying to clean up some constants. - erik
