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Message #76406
[Bug 1358949] [NEW] arm64 iperf performance suboptimal
Public bug reported:
[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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "optimized copy_to_user and copy_from_user for arm64"
https://bugs.launchpad.net/bugs/1358949/+attachment/4181987/+files/0001-UBUNTU-SAUCE-no-up-arm64-optimized-copy_to_user-and-.patch
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https://bugs.launchpad.net/bugs/1358949
Title:
arm64 iperf performance suboptimal
Status in “linux” package in Ubuntu:
New
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1358949/+subscriptions
Follow ups
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[Bug 1358949] Re: arm64 iperf performance suboptimal
From: Andrew Cloke, 2014-12-15
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[Bug 1358949] Re: arm64 iperf performance suboptimal
From: Andy Whitcroft, 2014-12-04
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[Bug 1358949] Re: arm64 iperf performance suboptimal
From: Launchpad Bug Tracker, 2014-09-22
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[Bug 1358949] Re: arm64 iperf performance suboptimal
From: dann frazier, 2014-09-09
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[Bug 1358949] Re: arm64 iperf performance suboptimal
From: Brad Figg, 2014-09-08
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[Bug 1358949] Re: arm64 iperf performance suboptimal
From: Launchpad Bug Tracker, 2014-09-05
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[Bug 1358949] Re: arm64 iperf performance suboptimal
From: Launchpad Bug Tracker, 2014-09-04
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[Bug 1358949] Re: arm64 iperf performance suboptimal
From: Launchpad Bug Tracker, 2014-08-22
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[Bug 1358949] Re: arm64 iperf performance suboptimal
From: Tim Gardner, 2014-08-21
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[Bug 1358949] Re: arm64 iperf performance suboptimal
From: Joseph Salisbury, 2014-08-19
-
[Bug 1358949] [NEW] arm64 iperf performance suboptimal
From: dann frazier, 2014-08-19
References