This is the same test, repeated, sans firewall rules - all iptables
rules cleared. I get about 220MB/sec without oprofile running, and 208
with it running. (vs about 190MB with the iptables rules in the
previous run)

As noted earlier this is with netperf running on the router itself,
with web10g patched in. Web10g supplies some interesting statistics
(attached), and I have a tcptrace/xplot.org screenshots of the
previous run here:

http://huchra.bufferbloat.net/~d/rc6-smoke-captures/

that is also interesting. There is a knee at 30 seconds and other
somewhat odd looking behavior when you zoom in.

I further note that the laptop driving this test (via a gige pcmcia
card) has a default txqueuelen of 1000 and I don't presently know the
length of the dma tx ring, and is running the std ubuntu 11.4 kernel (
 2.6.38-11-generic), with ecn,sack,dsack enabled.

And the best performance I've got from the laptop to a pentium 4 box
was 290Mbit. I note that I'm pretty happy with 220Mbit OK! I wanted to
have a baseline value before I started fiddling with vlan and dscp
stuff....


CPU: MIPS 24K, speed 0 MHz (estimated)
Counted INSTRUCTIONS events (Instructions completed) with a unit mask
of 0x00 (No unit mask) count 100000
samples  %        app name                 symbol name
-------------------------------------------------------------------------------
17141    14.8045  vmlinux                  csum_partial
  17141    100.000  vmlinux                  csum_partial [self]
-------------------------------------------------------------------------------
17024    14.7035  vmlinux                  __copy_user
  17024    100.000  vmlinux                  __copy_user [self]
-------------------------------------------------------------------------------
8888      7.6765  nf_conntrack             /nf_conntrack
  8888     100.000  nf_conntrack             /nf_conntrack [self]
-------------------------------------------------------------------------------
4139      3.5748  vmlinux                  __do_softirq
  4139     100.000  vmlinux                  __do_softirq [self]
-------------------------------------------------------------------------------
4055      3.5023  ip_tables                /ip_tables
  4055     100.000  ip_tables                /ip_tables [self]



-- 
Dave Täht
SKYPE: davetaht
US Tel: 1-239-829-5608
http://the-edge.blogspot.com