> Looks like you have TSO enabled. Does it behave differently if it's > disabled?
It cranks the interrupts/sec up to 8K instead of 5K. No difference in performance other than that. > I think Rick Jones is on to something with the HP ack avoidance. I sincerely doubt it. I'm only using the HP box because it has gigabit so it's a single connection. I can produce almost identical results by doing the same sorts of tests with several linux clients. One direction goes fast and the other goes slow. 3x performance difference depending on the direction of data flow: # Server is receiving, goes fast $ for i in 22 24 25 26; do rsh -n glibc$i dd if=/dev/zero|dd of=/dev/null & done load free cach swap pgin pgou dk0 dk1 dk2 dk3 ipkt opkt int ctx usr sys idl 0.98 0 0 0 0 0 0 0 0 0 30K 15K 8.1K 68K 12 66 22 0.98 0 0 0 0 0 0 0 0 0 29K 15K 8.2K 67K 11 64 25 0.98 0 0 0 0 0 0 0 0 0 29K 15K 8.2K 67K 12 66 22 # Server is sending, goes slow $ for i in 22 24 25 26; do dd if=/dev/zero|rsh glibc$i dd of=/dev/null & done load free cach swap pgin pgou dk0 dk1 dk2 dk3 ipkt opkt int ctx usr sys idl 1.06 0 0 0 0 0 0 0 0 0 5.0K 10K 4.4K 8.4K 21 17 62 0.97 0 0 0 0 0 0 0 0 0 5.1K 10K 4.4K 8.9K 2 15 83 0.97 0 0 0 0 0 0 0 0 0 5.0K 10K 4.4K 8.6K 21 26 53 $ for i in 22 24 25 26; do rsh glibc$i cat /etc/motd; done | grep Welcome Welcome to redhat71.bitmover.com, a 2Ghz Athlon running Red Hat 7.1. Welcome to glibc24.bitmover.com, a 1.2Ghz Athlon running SUSE 10.1. Welcome to glibc25.bitmover.com, a 2Ghz Athlon running Fedora Core 6 Welcome to glibc26.bitmover.com, a 2Ghz Athlon running Fedora Core 7 $ for i in 22 24 25 26; do rsh glibc$i uname -r; done 2.4.2-2 2.6.16.13-4-default 2.6.18-1.2798.fc6 2.6.22.4-65.fc7 No HP in the mix. It's got nothing to do with hp, nor to do with rsh, it has everything to do with the direction the data is flowing. -- --- Larry McVoy lm at bitmover.com http://www.bitkeeper.com - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
