You said your testing with iperf, what settings are you using?
Flow control is not flowtable no, which could still result in
a switch "issue" if linux and freebsd are setting different
values by default, similarly with duplex / speed, I would recommend
autoneg if your not already using.
Have you tried without tso, rxcsum, txcsum & lro disabled?
----- Original Message -----
From: "Adam Stylinski" <kungfujesu...@gmail.com>
To: "Steven Hartland" <kill...@multiplay.co.uk>
Cc: <freebsd-net@freebsd.org>
Sent: Thursday, April 28, 2011 3:45 PM
Subject: Re: em0 performance subpar
I was using the default value for maxsockbuf, doesn't seem to hurt or help. The only value you've listed that I didn't have
tweaked to a comparable value already was the nmbclusters, changing it seems to have no effect, though. vmstat -i should display
my interrupts, which I don't think are particularly high. I am most definitely not CPU bound (utilization shows no hot CPUs), I
have 16GB of memory and plenty allocated to the kernel, and I believe flow control is enabled (should it not be?):
net.inet.flowtable.enable: 1
It's a 16 port netgear gigabit prosafe switch, and it's not likely to be the problem (like I said, the Linux hosts have no issues
with the same card).
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