** Changed in: linux (Ubuntu Utopic)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Trusty)
Status: In Progress => Fix Committed
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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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