Date: Sun, 13 Mar 2011 09:02:07 +0200 From: Aragon Gouveia <aragon@phat.za.net> To: freebsd-acpi@freebsd.org Subject: C2/C3 states cause poor TCP performance with re(4) Message-ID: <4D7C6BEF.9070303@phat.za.net>
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Hi, 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: http://wiki.freebsd.org/TuningPowerConsumption Thanks, Aragon
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