I'm trying to debug a possibly failing CPU, so I thought it would
be easy just disable the cores using machdep.hlt_cpus and see if
we see the panic's we've been seeing.
The problem is it seems ULE doesnt properly support machdep.hlt_cpus
and still schedules processes onto the halted cpus which obviously
causes problems.
Can anyone confirm this behaviour? Should machdep.hlt_cpus and I assume
the logical counterpart never be used with ULE?
Regards
Steve
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On Sat, 19 Feb 2011 12:36:57 -0000 "Steven Hartland" <killing@multiplay.co.uk> wrote:> I'm trying to debug a possibly failing CPU, so I thought it would > be easy just disable the cores using machdep.hlt_cpus and see if > we see the panic's we've been seeing. > > The problem is it seems ULE doesnt properly support machdep.hlt_cpus > and still schedules processes onto the halted cpus which obviously > causes problems. > > Can anyone confirm this behaviour? Should machdep.hlt_cpus and I assume > the logical counterpart never be used with ULE? >Looking at the kernel source it appears that only sched_4bsd.c makes use of hlt_cpus_mask. -- Gary Jennejohn
----- Original Message ----- From: "Gary Jennejohn" <gljennjohn@googlemail.com>> > Looking at the kernel source it appears that only sched_4bsd.c makes use > of hlt_cpus_mask.Given ULE is default do these need to be either removed totally or at least conditionally based on the scheduler choice as currently they are quite dangerous to a systems health? Regards Steve ===============================================This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.
on 19/02/2011 14:36 Steven Hartland said the following:> I'm trying to debug a possibly failing CPU, so I thought it would > be easy just disable the cores using machdep.hlt_cpus and see if > we see the panic's we've been seeing. > > The problem is it seems ULE doesnt properly support machdep.hlt_cpus > and still schedules processes onto the halted cpus which obviously > causes problems. > > Can anyone confirm this behaviour?Yes, your observations are correct. Please also see: http://www.freebsd.org/cgi/query-pr.cgi?pr=145385> Should machdep.hlt_cpus and I assume > the logical counterpart never be used with ULE?-- Andriy Gapon