On Jan 29, 2006, at 7:51 PM, Jason Mayfield-Lewis wrote:
We all know XBench isn't really a valid benchmark of ANYTHING. :-/
Slower with L3... What are they on?!
My guess is that xBench does one iteration of each test, but the
processor checks the L3 to see if the instructions are cached. Since
they are not, the time to check is wasted cycles. Whereas, without the
L3 it doesn't take the time to look.
Or
xBench runs a small amount of code multiple times. It does not fill the
256k L2, so it pulls instructions at the 1:1 ratio of the L2. When the
L3 is enabled, the processor is taking cycles to push information to
it, in the hope of using them soon, but wasting the the cycles.
Len
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