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From: "Dave Raven" <dave@raven.za.net>
To: "'Ingo Flaschberger'" <if@xip.at>
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Date: Tue, 26 Feb 2008 20:58:09 +0200
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Cc: freebsd-net@freebsd.org
Subject: RE: Hping/Ping
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Also - sometimes during my testing I see this message, it's hard to make it
happen but its been popping up I'm not sure if its related/different etc --

"sendto: No buffer space available"

Thanks
Dave


-----Original Message-----
From: Ingo Flaschberger [mailto:if@xip.at] 
Sent: Tuesday, February 26, 2008 8:45 PM
To: Dave Raven
Cc: freebsd-net@freebsd.org
Subject: RE: Hping/Ping

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