Phenom II X6 Performance Under Linux Below Expectations
In testing the Phenom II X6, Linux Magazine noticed that AMDs new processor doesn't have the full performance under the current Linux kernel. A bug in Linux power management throws a wrench into the six-core processing.
With Ubuntu 9.04 and kernel 2.6.28, the Phenom II X6 1090T processor exhibited 19% better performance, much like Intel's "Gulftown" Core i7 980, in the LUbench benchmark. However, the performance was far more disappointing with Ubuntu 9.04 under kernel 2.6.31. Only by deactivating AMD's Cool'n'Quiet power-saving technology did the Phenom II X6 get anywhere near the expected performance with Ubuntu 9.10.
AMD's Operating Systems Research Center (OSRC) in Dresden, responsible for Linux development under the direction of Chris Schlaeger, confirmed that the new Turbocore module of the Phenom II X6 was getting into conflict with the kernel's powernow-k8 frequency regulator module.
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