issues with bnx2 - NETDEV WATCHDOG: eth0: transmit timed out

Matt Domsch Matt_Domsch at
Wed Apr 28 11:28:44 CDT 2010

On Tue, Dec 15, 2009 at 09:00:58AM -0800, PJF wrote:
> Greetings,
> On our new R410, randomly when eth0 is pushing more than 30Mbps of traffic
> the interface sometimes times out and shuts off:
> Dec 15 07:53:59 web1 kernel: NETDEV WATCHDOG: eth0: transmit timed out
> Dec 15 07:53:59 web1 kernel: bnx2: eth0 NIC Copper Link is Down
> We are running CentOS 5.4 x86_64
> Cat6 has been replaced, tried different ports on the switch, made no
> difference.
> This morning I found this post suggesting adding "options bnx2 disable_msi=1
> in /etc/modprobe.conf"

As a follow-up, this has been root caused, and a kernel patch is now
accepted upstream.

Kudos to the Dell Linux Engineering team for staying on this, getting
to ultimate root cause, and driving a valid workaround into the community.

Matt Domsch
Technology Strategist
Dell | Office of the CTO

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