Re: ppc64le: `NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!!` when turning off SMT

2022-02-08 Thread Paul A. Clarke
On Tue, Feb 08, 2022 at 02:17:03PM +0100, Frederic Weisbecker wrote: > On Tue, Feb 08, 2022 at 08:32:37AM +0100, Paul Menzel wrote: > > once warned about a NOHZ tick-stop error, when I executed `sudo > > /usr/sbin/ppc64_cpu --smt=off` (so that KVM would work). > > I see, so I assume this sets some

Re: ppc64le: `NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!!` when turning off SMT

2022-02-08 Thread Frederic Weisbecker
On Tue, Feb 08, 2022 at 08:32:37AM +0100, Paul Menzel wrote: > Dear Linux folks, > > > On the POWER8 server IBM S822LC running Ubuntu 21.10, Linux 5.17-rc1+ built > with > > $ grep HZ /boot/config-5.17.0-rc1+ > CONFIG_NO_HZ_COMMON=y > # CONFIG_HZ_PERIODIC is not set > CONFIG_NO_H

ppc64le: `NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!!` when turning off SMT

2022-02-07 Thread Paul Menzel
Dear Linux folks, On the POWER8 server IBM S822LC running Ubuntu 21.10, Linux 5.17-rc1+ built with $ grep HZ /boot/config-5.17.0-rc1+ CONFIG_NO_HZ_COMMON=y # CONFIG_HZ_PERIODIC is not set CONFIG_NO_HZ_IDLE=y # CONFIG_NO_HZ_FULL is not set CONFIG_NO_HZ=y # CONFIG_HZ