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From: Giuliano Pochini <pochini@shiny.it>
To: Nathan Lynch <ntl@pobox.com>
Subject: Re: CPU 1 refused to die!
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On 23-May-2006 Nathan Lynch wrote:
> Giuliano Pochini wrote:
>>
>> I booted with maxcpus=1, then I enabled the 2nd cpu
>> with echo 1 > /sys/devices/system/cpu/cpu1/online
>
> So onlining at runtime seems to work.  Did you verify that tasks get
> run on the 2nd cpu after you online it?

Yes, I did, and the difference in speed is pretty obvious.


> Any other strange messages in dmesg?

Nothing unusual.


> Can you online and offline cpus if you boot without maxcpus=1?

It behaves exactly the same. I can't say exactly when it stopped
working. 2.6.14 worked fine.


--
Giuliano.