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Tasklist

FS#61682 - [linux] 4.20 autosuspend causes 1 core to spend all it's time in kernel space.

Attached to Project: Arch Linux
Opened by Jakub (kubast2) - Friday, 08 February 2019, 19:51 GMT
Last edited by Andreas Radke (AndyRTR) - Thursday, 09 January 2020, 05:47 GMT
Task Type Bug Report
Category Kernel
Status Closed
Assigned To Jan Alexander Steffens (heftig)
Architecture x86_64
Severity Medium
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description:
Usb driver sits the whole time in kernel space, disabling usb autosuspend with usbcore.autosuspend=-1 kernel cmdline gets rid of the issue, and gives a noticeable boost to ffmpeg encoding times.

Additional info:
* 4.20.7
* in attachments compressed 10 seconds perf report

Steps to reproduce:
1.Turn on my laptop.
2.kworker uses 80% of a single cpu core, one cpu core spends 100% of the time in kernel space at all time.
3.Disconnecting all usb devices doesn't help.
   perf.data.xz (541.5 KiB)
This task depends upon

Closed by  Andreas Radke (AndyRTR)
Thursday, 09 January 2020, 05:47 GMT
Reason for closing:  Fixed
Comment by Jakub (kubast2) - Friday, 08 February 2019, 22:02 GMT
[Deleted]
Comment by Andreas Radke (AndyRTR) - Tuesday, 10 December 2019, 16:05 GMT
Is this still an issue?
Comment by Jakub (kubast2) - Wednesday, 08 January 2020, 21:56 GMT
Nope it seemingly got fixed, I tried to go back to previous kernel version(4.20.7), but the problem didn't persist.

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