Public bug reported:
[Impact]
100Gbps network performance, as measured on an hns3 controller, doesn't scale
as queue size goes up.
[Test Case]
Use a traffic generator instrument to generate load, using the SUT as an IP
forwarder.
19.04 today:
8 queue 12 queue 16 queue 24 queue
37G 45G 38G 33G
With the patch applied:
8 queue 12 queue 16 queue 24 queue
37G 50G 47G 47G
[Fix]
14bd9a607f908 iommu/iova: Separate atomic variables to improve performance
[Regression Risk]
The patch makes no functional change, just reorders members of a structure.
However, it is possible that this has unforeseen negative performance impacts
on some platform.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Affects: linux (Ubuntu Disco)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Affects: linux (Ubuntu Eoan)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Also affects: linux (Ubuntu Eoan)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Disco)
Status: New => In Progress
** Changed in: linux (Ubuntu Disco)
Assignee: (unassigned) => dann frazier (dannf)
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https://bugs.launchpad.net/bugs/1832909
Title:
Cache line contention prevents scaling of 100Gbps performance
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Disco:
In Progress
Status in linux source package in Eoan:
In Progress
Bug description:
[Impact]
100Gbps network performance, as measured on an hns3 controller, doesn't scale
as queue size goes up.
[Test Case]
Use a traffic generator instrument to generate load, using the SUT as an IP
forwarder.
19.04 today:
8 queue 12 queue 16 queue 24 queue
37G 45G 38G 33G
With the patch applied:
8 queue 12 queue 16 queue 24 queue
37G 50G 47G 47G
[Fix]
14bd9a607f908 iommu/iova: Separate atomic variables to improve performance
[Regression Risk]
The patch makes no functional change, just reorders members of a structure.
However, it is possible that this has unforeseen negative performance impacts
on some platform.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1832909/+subscriptions
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