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Date: Thu, 25 Mar 2010 09:39:40 -0600
From: Michael Loftis <mloftis@wgops.com>
To: Mailing List FreeBSD Stable <freebsd-stable@FreeBSD.org>
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Subject: Re: 8-STABLE freezes on UDP traffic (DNS), 7.x doesn't
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--On Thursday, March 25, 2010 3:22 PM +0100 Attila Nagy <bra@fsn.hu> wrote:

<...>
> Both unbound and python accepts DNS requests, and it seems when 25%
> interrupt happens, only unbound is in *udp state, where it is 50%, both
> programs are in that state.

Try turning of hardware TSO/checksum offload if it's availble on your 
chipset?  ifconfig <interface> -rxcsum -txcsum -tso -- I'm only using nfe 
chips right now, but w/ the TSO/CSUM on they lock up constantly under high 
load.  We're pretty sure it's mostly the nfe driver, or the chips 
themselves, but have never ruled out some generic 8.x hardware offload 
issues.