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Bug#572201: linux-image-2.6.32-trunk-amd64: forcedeth driver hangs under heavy load



On Tue, 2010-03-02 at 10:33 +0000, stephen mulcahy wrote:
> Package: linux-2.6
> Version: 2.6.32-5
> Severity: grave
> 
> When running linux-image-2.6.32-trunk-amd64, the network stops 
> responding if large amounts of traffic are transmitted/received. Running 
> ifdown eth0 followed by ifup eth0 restores operation of the network. 
> There are no errors relating to this failure logged in /var/log that I 
> could see.

There is a 'TX watchdog' that will log a warning if a network device
stops transmitting and the driver has not reported that the link is
down.  If you do not see such a warning in the log then the problem may
lie outside this driver.

What protocol(s) are you using when this occurs?

> Downgrading to linux-image-2.6.30-2-amd64 results in a stable network. 
> Not sure if this is a forcedeth specific problem or a general problem in 
> the newer kernel (I have seen problems with forcedeth on other 
> distro/kernel combinations).

I don't believe this is a general problem.

> Happy to run further diagnostics to tie this down if you let me know 
> what to run.

We'll want to see the kernel log (output from dmesg) after this happens,
even if you can't spot anything in it.

The device statistics (output from ethtool -S eth0) might also be
informative.

Ben.

-- 
Ben Hutchings
Q.  Which is the greater problem in the world today, ignorance or apathy?
A.  I don't know and I couldn't care less.

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