HTT on Atom (Was: FreeBSD 8.0 and Atheros AzureWave wireless chipset)

At 04:33 PM 11/26/2009, Manolis Kiagias wrote:

Though it seems hyperthreading is improved on the Atom and there is no
penalty for leaving it on.

Is there really no penalty? With HZ=1000 there are double the clock interrupts to be serviced at least. And as I understand it the Atom has less redundant hardware, so there are less likely to be unused resources available to the second thread. I am seeing substantially faster compiles with the SMP option commented out of the kernel.

--Brett



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