Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: nonboot cpu on SMP suspend | Date | Thu, 19 Mar 2009 13:30:58 +0100 |
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On Thursday 19 March 2009, Li Yang wrote: > On Thu, Mar 19, 2009 at 3:04 PM, chen gong <gong.chen@linux.intel.com> wrote: > > Rafael J. Wysocki 写道: > >> > >> On Wednesday 18 March 2009, Li Yang wrote: > >>> > >>> Hi all, > >>> > >>> I'm curious why we need to un-plug all the nonboot cpus before suspend > >>> and start them all over again after the suspend(ACPI sleep)? I mean > >>> if we can bring the booting cpu back to the exact state as before > >>> suspend, why can't we just do the same for non-booting cpus? And that > >>> will be much faster. Any thought? Thanks. > >> > >> Because we need to enter the BIOS with one CPU on-line only. > >> > > You mean only one CPU can be supported by BIOS when suspend/resume ? > > If so, is it a defect of x86 BIOS? And is it true that for other > architectures without a BIOS there won't be such a limitation if the > boot code is sane? Thanks
I think that is a limitation of x86 BIOS and I don't know enough about the other architectures to comment.
Thanks, Rafael
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