From owner-freebsd-net@FreeBSD.ORG  Thu Feb 15 01:02:54 2007
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Date: Thu, 15 Feb 2007 01:02:50 +0000
From: "Bruce M. Simpson" <bms@FreeBSD.org>
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Subject: Re: Gateway slowed down to barely usable
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Andrea Venturoli wrote:
>
> Today it suddenly dropped to a bare few b/s. I checked the ISP line by 
> attaching another machine in place of this and it could do full 1Mb/s, 
> so this box was the problem.
>
> After a simple reboot it started working as good as always.
>
> Now the question is: in case this happens again, how do I find out 
> what's wrong?
> CPU usage was under 2% and so was swap usage... what else could I check?
> What tools should I use?
Points for further investigation:
How long was the machine up for?
Exactly which network components in FreeBSD are you using?
Do you have any figures on what kind of network load the machine was 
dealing with?
Can you rule out problems with an intermediate switch?

Based on what you've said I can only speculate that the possible causes 
are either mbuf memory fragmentation or a driver problem; both are a 
total stab in the dark.

Regards,
BMS
>
>  bye & Thanks
>     av.
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