C2/C3 states cause poor TCP performance with re(4)
aragon at phat.za.net
Sun Mar 13 07:20:41 UTC 2011
I've recently been hunting down a TCP performance issue with re(4) on a
system that has C3 states enabled. In short, outgoing TCP traffic shows
good performance, but incoming TCP traffic has very unstable throughput
with substantial packet loss evident in a tcpdump.
The same was observed with C2 states enabled. Limiting to C1 states
brought performance back to normal.
Can anyone confirm if this is reproducible with drivers other than
re(4)? Am I expecting too much in the hope of achieving both C3 states
and good performance out of re(4)? Any pointers on getting there?
This system is tuned using mav@'s tuning guide:
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