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[Ming Lei <1425576@xxxxxxxxxxxxxxxxxx>]

ubuntu@ms10-40-mcdivittA3:~$ uname -a
Linux ms10-40-mcdivittA3 3.16.0-44-generic #59-Ubuntu SMP Tue Jul 7 02:18:58 UTC 2015 aarch64 aarch64 aarch64 GNU/Linux
ubuntu@ms10-40-mcdivittA3:~$ 
ubuntu@ms10-40-mcdivittA3:~$ 
ubuntu@ms10-40-mcdivittA3:~$ 
ubuntu@ms10-40-mcdivittA3:~$ iperf -c 10.229.0.101 -P 8 -t 120
------------------------------------------------------------
Client connecting to 10.229.0.101, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[ 10] local 10.229.65.140 port 48807 connected with 10.229.0.101 port 5001
[  5] local 10.229.65.140 port 48802 connected with 10.229.0.101 port 5001
[  3] local 10.229.65.140 port 48801 connected with 10.229.0.101 port 5001
[  4] local 10.229.65.140 port 48800 connected with 10.229.0.101 port 5001
[  6] local 10.229.65.140 port 48803 connected with 10.229.0.101 port 5001
[  7] local 10.229.65.140 port 48804 connected with 10.229.0.101 port 5001
[  8] local 10.229.65.140 port 48806 connected with 10.229.0.101 port 5001
[  9] local 10.229.65.140 port 48805 connected with 10.229.0.101 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-120.0 sec  3.46 GBytes   247 Mbits/sec
[  5]  0.0-120.0 sec   192 MBytes  13.4 Mbits/sec
[  6]  0.0-120.0 sec  2.94 GBytes   210 Mbits/sec
[  7]  0.0-120.0 sec  2.83 GBytes   203 Mbits/sec
[  8]  0.0-120.0 sec  3.19 GBytes   228 Mbits/sec
[  9]  0.0-120.0 sec   192 MBytes  13.4 Mbits/sec
[ 10]  0.0-120.1 sec   191 MBytes  13.3 Mbits/sec
[  4]  0.0-120.1 sec   191 MBytes  13.3 Mbits/sec
[SUM]  0.0-120.1 sec  13.2 GBytes   942 Mbits/sec


** Tags removed: verification-needed-utopic
** Tags added: verification-done-utopic

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https://bugs.launchpad.net/bugs/1425576

Title:
  Occasional crash in APM xgene enet driver on kernels prior to v3.19

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Utopic:
  Fix Committed

Bug description:
  [Impact]
  System panics every few hours under constant network load

  [Test Case]
  On the X-Gene system, start an iperf server:
    $ iperf -s
  Connect to it from another system (1Gbps is sufficient)
    $ iperf -t 100000 -c <xgene host>

  On failure, you'll get a panic within several hours.

  [Regression Risk]
  The proposed patch only touches the impacted driver. It is adding a memory barrier - albeit a lightweight one - so there is the risk of a performance degradation. Indeed, when measured using a 60s iperf run, I do see a performance drop, but by < 0.5%.

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