8-STABLE freezes on UDP traffic (DNS), 7.x doesn't

[Attila Nagy]

Hi,

Michael Loftis wrote:
>
>
> --On Thursday, March 25, 2010 3:22 PM +0100 Attila Nagy <bra at 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.
Bingo, this solved the problem. The current uptime nears four days.
Previously I couldn't go further than a day.

The machine gets very light TCP load (and other machines which get work
well), so I guess it's UDP RX or TX checksum related.