** Description changed:
[Impact]
- The copy_{to,from}_user implementations in the Ubuntu kernel are suboptimal.
Optimized implementations have been accepted upstream and have shown a
significant improvement in network performance.
+ Performance Regression.
+
+ The copy_{to,from}_user implementations in the Ubuntu kernel are
+ suboptimal. Optimized implementations have been accepted upstream and
+ have shown a significant improvement in network performance. Previous
+ Ubuntu releases included non-upstream versions of these patches, but
+ they were dropped during the wily cycle.
[Test Case]
Generate traffic from one node to another using iperf.
[Regression Risk]
These functions are obviously used heavily throughout the kernel, so a defect
here could have significant impact. However, it has been accepted by upstream
after some cycles of review. The backported patches have also been tested on
real arm64 hardware.
** Description changed:
[Impact]
Performance Regression.
The copy_{to,from}_user implementations in the Ubuntu kernel are
suboptimal. Optimized implementations have been accepted upstream and
have shown a significant improvement in network performance. Previous
Ubuntu releases included non-upstream versions of these patches, but
they were dropped during the wily cycle.
[Test Case]
Generate traffic from one node to another using iperf.
[Regression Risk]
- These functions are obviously used heavily throughout the kernel, so a defect
here could have significant impact. However, it has been accepted by upstream
after some cycles of review. The backported patches have also been tested on
real arm64 hardware.
+ These functions are obviously used heavily throughout the kernel, so a defect
here could have significant impact. However, it has been accepted by upstream
after some cycles of review, and we have shipped earlier versions of it in
every arm64 release prior to wily. The backported patches have also been tested
on real arm64 hardware.
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https://bugs.launchpad.net/bugs/1508471
Title:
[SRU] arm64 performance regression in wily 4.2 kernel on m400 due to
dropped patch
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