[tech] Murasoi dropouts

[James Andrewartha]

If you've been paying close attention, you may have noticed that murasoi's 
network is dropping occasionally. dmesg shows:

[Fri Jun 26 07:48:25 2015] e1000 0000:01:01.0 eth0: Detected Tx Unit Hang
  Tx Queue             <0>
  TDH                  <df>
  TDT                  <2e>
  next_to_use          <2e>
  next_to_clean        <dd>
buffer_info[next_to_clean]
  time_stamp           <10b250914>
  next_to_watch        <e1>
  jiffies              <10b2513b2>
  next_to_watch.status <0>
[Fri Jun 26 07:48:25 2015] e1000 0000:01:01.0 eth0: Reset adapter
[Fri Jun 26 07:48:29 2015] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX

Some quick googling returns 
http://blog.bradiceanu.net/2010/11/28/netdev-watchdog-eth0-transmit-timed-out/ 
which suggests building a more recent version of the e1000 driver (which 
is 8.0.35 vs 3.16's 7.3.21-k8-NAPI) and setting in modprobe.d:

options e1000 ignore_64bit_dma=1

Further discussion is happening in #ucc

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