Your mail is badly formatted. I suggest sending plain text as is the custom on these lists and perhaps using emacs instead of gmail :-) You didn't explain: if these tests used identical hardware if the interfaces are in full duplex mode which interface/driver is in use what 'RHEL 5.1' means in terms of Linux kernel version Also: As per the theory the performance from NetBSD to NetBSD should be more. Your footnote to the theory paper is missing :-) To figure out TCP performance, install pkgsrc/graphics/xplot-devel, and then, e.g. tcpdump -w FOO -i wm0 tcp netstat -s > BEFORE # also do this on the receiver and then do the blast, and then netstat -s > AFTER Then, diff -u BEFORE AFTER; <understand output> tcpdump -S -tt -n -r FOO | tcpdump2xplot and read all the documentation in the xplot sources and then use xplot to view the files. I just sent to a xen domU at 81 Mb/s, when the dom0 and the sender are on the same switch. So there may be something interesting about your situation, but generally NetBSD's TCP does fine on 100 Mb/s LANs.
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