kernel-packages team mailing list archive

[Peter Curtis <secondary@xxxxxxxxxxx>]

I have tried the test patch provided by Mathias Nyman in http://linux-
kernel.2935.n7.nabble.com/TESTPATCH-v2-xhci-fix-usb2-resume-timing-and-
races-tc1250796.html#a1256745 and rebuilt a Wily 4.2 kernel and that has
prevented High CPU usage of kworker/ksoftirqd under all the
circumstances I have tried. Note this is marked as a TESTPATCH and
Mathias Nyman mentions his intention is to  " do some minor cleanups and
add it to the queue ". At best it will be in the 4.4 kernel and then
available for backports  but it good to know that there is a solution in
hand.

@acelan Is there any way for you to also push the Mathias Nyman patch
into the ubuntu kernel, assuming it also solves your original problem.
Then normal users can just use an updated ubuntu kernel to get rid of
this issue. As it is a timing and race problem it may well turn out to
have  a much wider impact than current reports show, in particular as it
seems to affect Skylake machines.

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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1488426

Title:
  High CPU usage of kworker/ksoftirqd

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  In Progress

Bug description:
  kworker consuming 71.5% cpu resource
  ksoftirqd consuming 28.9% cpu resource

  It leads to power consumption issue and sometimes leads to BT does not
  work.

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