Date: Thu, 26 Nov 2009 19:18:41 -0700 From: Brett Glass <brett@lariat.net> To: Manolis Kiagias <sonicy@otenet.gr> Cc: questions@freebsd.org Subject: HTT on Atom (Was: FreeBSD 8.0 and Atheros AzureWave wireless chipset) Message-ID: <200911270218.TAA17345@lariat.net> In-Reply-To: <4B0F103D.2070607@otenet.gr> References: <200911260629.XAA08100@lariat.net> <alpine.BSF.2.00.0911260822290.63225@wonkity.com> <200911262320.QAA16364@lariat.net> <4B0F103D.2070607@otenet.gr>
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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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