netdev - niu lock-up (Transmit timed out, resetting) and NETDEV WATCHDOG

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Message-ID: <CAHOfOo3EZKWJuEGN3wxW9RBb_YXjLxv-DgCULrO=TPTuLSQcdA@mail.gmail.com>
Date:	Tue, 26 Mar 2013 13:46:25 +0000
From:	Andrew Brooks <arb@....dundee.ac.uk>
To:	Linux Net-Dev Mailing List <netdev@...r.kernel.org>
Subject: niu lock-up (Transmit timed out, resetting) and NETDEV WATCHDOG

Hello

Using niu driver for this card: Oracle/SUN Multithreaded 10-Gigabit
Ethernet Network Controller
after a period (often less than 24 hours) the interface will hang with
errors every 5 seconds
"niu: xxx: eth2: Transmit timed out, resetting"

Sometimes also in syslog are messages
WARNING: at sch_generic:255 dev_watchdog
NETDEV WATCHDOG: eth2 (niu): transmit queue 10 timed out

I've seen this in kernel 3.5.0-26-generic #42~precise1-Ubuntu SMP
but I've not seen it in kernel 3.2.0-38-generic #61-Ubuntu SMP

Is there some change between kernels which has broken the driver
or is the difference elsewhere?

Thanks

Andrew
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