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Groups > linux.debian.kernel > #60253
| From | Hillel Lubman <shmerl@mykolab.com> |
|---|---|
| Newsgroups | linux.debian.bugs.dist, linux.debian.kernel |
| Subject | Bug#804857: CONFIG_RCU_NOCB_CPU? |
| Date | 2018-02-21 03:10 +0100 |
| Message-ID | <vls14-r1-5@gated-at.bofh.it> (permalink) |
| References | <qtZXc-VN-13@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Cross-posted to 2 groups.
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On Thu, 12 Nov 2015 17:29:35 +0000 Ben Hutchings <ben@decadent.org.uk> wrote: > > But for other configurations it is worse: > > config NO_HZ_FULL > bool "Full dynticks system (tickless)" > ... > This is implemented at the expense of some overhead in user <-> kernel > transitions: syscalls, exceptions and interrupts. Even when it's > dynamically off. > > Say N. > > I think we should enable this for the rt featureset when it's next > available, but not by default. > > Ben. What about CONFIG_RCU_NOCB_CPU? There is currently a nasty hardware freeze / reboot bug that affects AMD Ryzen CPUs on Linux: https://bugzilla.kernel.org/show_bug.cgi?id=196683[1] Many report, that setting rcu-nocbs kernel parameter works around it at least partially, but it requires the kernel to be built with CONFIG_RCU_NOCB_CPU=Y. Can it be enabled in Debian, or there are reasons not to do it? Thanks! Hillel. -------- [1] https://bugzilla.kernel.org/show_bug.cgi?id=196683
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Bug#804857: linux: New feature: enable CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU/CONFIG_RCU_NOCB_CPU_NONE Quentin Deldycke <quentindeldycke@gmail.com> - 2015-11-12 14:20 +0100 Bug#804857: linux: New feature: enable CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU/CONFIG_RCU_NOCB_CPU_NONE Ben Hutchings <ben@decadent.org.uk> - 2015-11-12 18:40 +0100 Bug#804857: CONFIG_RCU_NOCB_CPU? Hillel Lubman <shmerl@mykolab.com> - 2018-02-21 03:10 +0100 Bug#804857: linux: New feature: enable CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU/CONFIG_RCU_NOCB_CPU_NONE Witold Baryluk <witold.baryluk@gmail.com> - 2018-11-14 19:10 +0100 Bug#804857: RE OECIPOLLETTI <OECIPOLLETTI@trabajo.gob.ar> - 2019-07-11 10:50 +0200
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