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List:       e1000-devel
Subject:    Re: [E1000-devel] Fake TX hangs
From:       "Skidmore, Donald C" <donald.c.skidmore () intel ! com>
Date:       2015-09-22 17:12:12
Message-ID: F6FB0E698C9B3143BDF729DF2228664691348CF0 () ORSMSX110 ! amr ! corp ! intel ! com
[Download RAW message or body]

Hey Tal Abudi,

The Fake Tx hang message means that the stack is trying to reset the driver since it \
"thinks" we are hung however the driver doesn't believe that there is anything it can \
transmit.  This is most often cased but excessive flow control or a faulty switch.  \
What does your ethtool stats show?  And you might what to test with FC disabled \
(assuming you have it enabled currently) to see if the messages go away.

Thanks,
-Don Skidmore <donald.c.skidmore@intel.com>


> -----Original Message-----
> From: Tal Abudi [mailto:talabudi@gmail.com]
> Sent: Monday, September 21, 2015 11:37 PM
> To: e1000-devel@lists.sourceforge.net
> Subject: [E1000-devel] Fake TX hangs
> 
> Hi All
> My system is experiencing strange fake TX hangs. I'm running ixgbe
> 3.9.15 on a modified 2.6.18 Linux (with multi queue enabled, Per TX queue
> lock).
> 
> ixgbe 0000:82:00.1: eth0: Fake Tx hang detected with timeout of 5 seconds
> NETDEV WATCHDOG: eth0: transmit timed out ixgbe 0000:82:00.1: eth0: Fake
> Tx hang detected with timeout of 10 seconds NETDEV WATCHDOG: eth0:
> transmit timed out ixgbe 0000:82:00.1: eth0: Fake Tx hang detected with
> timeout of 20 seconds
> 
> And this keeps going on.
> The messages are from ixgbe_tx_timeout() which is invoked from
> dev_watchdog() (sch_generic.c)
> 
> I instrumented the kernel and the ixgbe driver and found that
> ixgbe_maybe_stop_tx() stop a tx queue in ixgbe_xmit_frame_ring().
> 
> Please help me figure out where the queue is restart or the device is
> restarted.
> Looking at ethtool -S show tx_restart_queue as 0.
> I'm running a Spirent Avalanche test so it's quite consistent.
> 
> Any leads ?
> Thanks !
> 
> --
> Best regards,
> Tal Abudi
> 
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