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Date: Tue, 26 Feb 2008 19:44:35 +0100 (CET)
From: Ingo Flaschberger <if@xip.at>
To: Dave Raven <dave@raven.za.net>
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Cc: freebsd-net@freebsd.org
Subject: RE: Hping/Ping
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Dear Dave,

> I have set my icmplim to 1024. When it was 200 I would sometimes get a
> warning about an OPEN port RST - which was also strange to me (that it was
> open not closed). I suspected that it was because 5% of my packets where
> being dropped though.
>
> The server is under reasonable load (networking wise) around 80-90mbits, but
> the processor is 75% idle..
>
> The other strange this is that a reboot solves this, and it takes around 1-2
> days to happen again..

you can try to enable polling:
kern.polling.reg_frac=20
kern.polling.user_frac=10
kern.polling.burst_max=1000

and perhaps tune rx_processing limit:
dev.em.0.rx_processing_limit: 100

you can also look at all open sessions when the server is in trouble:
netstat -n

Kind regards,
 	Ingo Flaschberger