** Changed in: linux (Ubuntu Eoan)
Assignee: Khaled El Mously (kmously) => Marcelo Cerri (mhcerri)
** Changed in: linux (Ubuntu Disco)
Assignee: (unassigned) => Marcelo Cerri (mhcerri)
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => Khaled El Mously (kmously)
** Also affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-azure (Ubuntu Bionic)
Status: New => Invalid
** Changed in: linux-azure (Ubuntu Eoan)
Status: New => Invalid
** Changed in: linux (Ubuntu Disco)
Status: New => In Progress
** Changed in: linux-azure (Ubuntu Disco)
Status: New => In Progress
** Changed in: linux-azure (Ubuntu Disco)
Assignee: (unassigned) => Marcelo Cerri (mhcerri)
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1832151
Title:
Unexpected CFS throttling
Status in linux package in Ubuntu:
Incomplete
Status in linux-azure package in Ubuntu:
New
Status in linux source package in Bionic:
Fix Released
Status in linux-azure source package in Bionic:
Invalid
Status in linux source package in Disco:
In Progress
Status in linux-azure source package in Disco:
In Progress
Status in linux source package in Eoan:
Incomplete
Status in linux-azure source package in Eoan:
Invalid
Bug description:
Basically, this issue:
https://bugzilla.kernel.org/show_bug.cgi?id=198197
..is affecting a cloud provider on a 4.15 kernel.
Customer testing with a kernel that is patched with the fix (upstream:
de53fd7aedb100f03e5d2231cfce0e4993282425 ) confirms that it resolves
the issue.
More details in the SalesForce ticket:
https://canonical.my.salesforce.com/5003z00001yUmC1
[Impact]
* Aggressive throttling by CFS causes severe performance degradation
in some cases.
[Test Case]
* This reproducer clearly shows the problem before the fix and shows no
problem after the fix:
https://gist.github.com/bobrik/2030ff040fad360327a5fab7a09c4ff1
[Regression Potential]
* It touches core scheduler code so regression could be bad - but
risk is low as the patch is accepted in mainline and tested separately
by myself, the cloud provider, and at least 2 others.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1832151/+subscriptions
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