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You mean the L2 cache on the processor? Well, this should always be on... some (rare) BIOS have the ability to turn this off but I really don't see the point of doing so...
Why do you believe that you L2 is off?
I have a hacked(overclocked) thinkpad 600e where I have had to turn off L2 to get rid of post errors. I had to turn it back on after it started. I googled up a module named pIIIcache the I can modprobe with boot.local. It makes a big difference when the L2 is turned on.
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