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Date:      Tue, 04 Feb 2003 02:19:41 +0100
From:      Marko Zec <zec@tel.fer.hr>
To:        Matthew Dillon <dillon@apollo.backplane.com>
Cc:        Peter Radcliffe <pir@pir.net>, stable@FreeBSD.ORG
Subject:   Re: "ping: sendto: No buffer space available"
Message-ID:  <3E3F152D.6BE3A41B@tel.fer.hr>
References:  <20030203212349.GG12779@pir.net> <20030204003205.T30858@marvin.sko.mh.se> <20030204000108.GA23967@pir.net> <200302040027.h140RwI8038634@apollo.backplane.com>

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Matthew Dillon wrote:

> :Mats Larsson <myrslok@marvin.sko.mh.se> probably said:
> :> On a 4.4 box I got this error using some old ep(4) card, a card
> :> switch Solved my problems back then. If you have the possible then
> :> test with a different card.
> :
> :A different card isn't much use - it's the built in wireless.
>
>     Check the queue statistics.  It could be a queue overflow due to
>     stalls in the wireless card accepting new packets, due to
>     excessive collisions on a hard line.
>
>     test2:/home/dillon> sysctl -a | fgrep ip.intr_qu
>     net.inet.ip.intr_queue_maxlen: 50
>     net.inet.ip.intr_queue_drops: 0

Hmm... the issue here is with interface _outbound_ buffers, not with the IP
inbound queue. Despite ping / ip_output() claiming ENOBUFS,
net.inet.ip.intr_queue_drops will probably remain unchanged. netstat -s /
netstat -i would probably offer better diagnostics in this case.

Marko



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