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Groups > linux.debian.kernel > #62230 > unrolled thread
| Started by | Yves-Alexis Perez <corsac@debian.org> |
|---|---|
| First post | 2018-09-25 20:30 +0200 |
| Last post | 2018-09-25 20:30 +0200 |
| Articles | 1 — 1 participant |
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Bug#816176: linux-image-4.3.0-0.bpo.1-amd64: xhci_hub_control causes abnormally high CPU usage when no USB devices attached Yves-Alexis Perez <corsac@debian.org> - 2018-09-25 20:30 +0200
| From | Yves-Alexis Perez <corsac@debian.org> |
|---|---|
| Date | 2018-09-25 20:30 +0200 |
| Subject | Bug#816176: linux-image-4.3.0-0.bpo.1-amd64: xhci_hub_control causes abnormally high CPU usage when no USB devices attached |
| Message-ID | <wC0fT-5qN-1@gated-at.bofh.it> |
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On Sun, 28 Feb 2016 12:19:43 +0100 Anders Nylander <randomsalad@gmail.com> wrote: > Following the removal of of the USB device, I noticed very high CPU usage > being caused by kworker and ksoftirqd. > Using perf to log 10s of data and then reading the report, I noticed that > xhci_hcd/xhci_hub_control was generating a LOT of work for the kworker > (~42%). I'm experiencing a very similar behavior on my ThinkPad X250 attached to a dock. It doesn't happen every time I resume, but quite often these days (on 4.18.8-1). Unplugging an USB3 disk plugged to the dock fixed the problem for me, and replugging it worked as well, so maybe there's some kind of loop I managed to break with that. I also noticed https://bugzilla.redhat.com/show_bug.cgi?id=1325488 on the exact same setup, but there's no other info there. I'll try to dig upstream, but unfortunately it's not that easily reproducible here. Regards, - -- Yves-Alexis -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEE8vi34Qgfo83x35gF3rYcyPpXRFsFAluqfCEACgkQ3rYcyPpX RFtQ6ggA36IjHB87mtIr2ciKDn2DY5afR2oWQ1zlmKXBRQBwVTSxxVFOJ/HP8Mhi flNOTgChEDjs9+cZiWAPxfJkEpbJBkXxVrios0/eRaV5drpCh5oo3h40ln1E4H+M 6ouvDvKtOo8szqJppE2ATYIZ3uXknaN53b2bDAUvjuPHTp688vk47hTCL3rPjVTL LQifiMHWQcqixodBZTh+uQxdDDjKrQ7bVY0gUjAEEkQq/2wgAm1RFtYtHAMfvfek 6gWmQ58mRsaEVTWPaLqSBhybEfvw8djlNo4sp2F/rT/0Hzp1OCIrzbQDUnGB9ttP VF//XAvs8/5ChbhMPNXNRCkS6CFxBw== =EgQP -----END PGP SIGNATURE-----
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