Re: 2.6.27rc1 cannot boot more than 8CPUs

[Max Krasnyansky]

Li Zefan wrote:
> Max Krasnyansky wrote:
> > Jeff Chua wrote:
> > > On Wed, Aug 6, 2008 at 11:54 AM, Max Krasnyansky <maxk@xxxxxxxxxxxx>
> > > wrote:
> > >
> > > > Are you running 32-bit kernel ?
> > > Yes. But, does it matter?
> > It used to. 64-bit kernel used to handle maxcpus option as documented in
> > the Documentation/cpu-hotplug.txt and 32-bit one was broken.
> > I just looked at the latest code and realized that both are now broken.
> > They ignore cpu id > maxcpus instead of not-booting them.
>
> Yes. I have an x86_64 box with 4 cpus, but yesterday when I booted up with maxcpus=2,
> I didn't see the other 2 cpus.
>
> > I'll send a patch that fixes that tomorrow.
>
> greate :)

I just sent it and CC'ed both of you guys.
	[PATCH] Resurect proper handling of maxcpus= kernel option

Jeff, maybe you can try again booting with maxcpus=8 and then bringing 
them online one by one to see where/what fails.

Max


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