On 10/07/2016 03:57 PM, Linus Torvalds wrote: > On Fri, Oct 7, 2016 at 12:38 PM, Joseph Salisbury > <joseph.salisb...@canonical.com> wrote: >> A kernel bug report was opened against Ubuntu [0]. After a kernel >> bisect, it was found that reverting the following commit resolved this bug: > Hmm. Interesting, and it sounds like we should revert that unless > somebody figures out *why* following the rules wrt cfq updates causes > problems. But I also wonder what the Ubuntu kernel config is. Does > Ubuntu enable CONFIG_SCHED_AUTOGROUP=y, for example? Because > regardless of any other scheduler issues, autogrouping *should* mean > that when you run some CPU hogger in one session, that should still > balance all CPU time with other sessions.. > > I'm not seeing anything odd on my xps13, which should have a similar > CPU to the X1 Carbon. > > Linus Hi Linus,
Yes, CONFIG_SCHED_AUTOGROUP is enabled in the Ubuntu kernel. However, that config was also enable in the Ubuntu 4.4 kerrnels without seeing this issue. I can try disabling the config in the 4.8 based kernel and see if that changes things. Thanks, Joe
