Thanks, Adam and Mark.

The trick is to have the 

possible_cpus=<number> 

kernel boot paramter set to the maximum number of CPUs you want Linux to
have. Then adding/dropping them is simple......

DJ

Original Message:
-----------------
From: Adam Thornton [EMAIL PROTECTED]
Date: Thu, 12 Jun 2008 10:35:58 -0500
To: [email protected]
Subject: Re: Adding virtual CPUs to a running Linux guest


See if you can locate the CPU at

/sys/devices/system/cpu/cpu1

If that is present, then

Echo 1 > /sys/devices/system/cpu/cpu1/online

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