Can you also send this patch to the Ubuntu kernel-team mailing list for
review?
** Tags added: kernel-da-key trusty
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: New => Triaged
** Tags added: patch
** Changed in: linux (Ubuntu)
Importance: Medium => High
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https://bugs.launchpad.net/bugs/1358949
Title:
arm64 iperf performance suboptimal
Status in “linux” package in Ubuntu:
Triaged
Bug description:
[Impact]
The copy_{to,from}_user implementations in the Ubuntu kernel are suboptimal.
Optimized implementations have been submitted upstream and have shown a
significant improvement in network performance.
Iperf performance increase:
-l (size) 1 core result
Optimized 64B 44-51Mb/s
1500B 4.9Gb/s
30000B 16.2Gb/s
Original 64B 34-50.7Mb/s
1500B 4.7Gb/s
30000B 14.5Gb/s
[Test Case]
Generate traffic from one node to another using iperf (see above for config).
[Regression Risk]
These functions are obviously used heavily throughout the kernel, so a defect
here could have significant impact. This risk is mitigated by using an
implementation heavily based on the linaro string libraries (which are used in
other places already, e.g. glibc), and through active testing of this patch on
real hardware using a trusty-kernel base.
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