RE: Hping/Ping

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@xxxxxx]
Sent: Tuesday, February 26, 2008 8:45 PM
To: Dave Raven
Cc: freebsd-net@xxxxxxxxxxx
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

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