Date: Sat, 31 Dec 2005 15:30:29 +0100 From: Niek Bouman <n.j.bouman@student.utwente.nl> To: freebsd-smp@freebsd.org Subject: FreeBSD 6-STABLE and HyperThreading Message-ID: <43B69605.3030505@student.utwente.nl>
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Hi, I have a pc with a pentium4 cpu with HT support running FreeBSD 6-STABLE. In the GENERIC kernel, SMP is turned off by default. I am wondering whether it is useful to enable HT-support. In the usenet discussions, I have seen a lot about the HT security flaw that was detected a while ago. Also I read about some rumours saying that the system performance decreases with HT enabled in freebsd, because freebsd thinks that there are 2 physical cpu's and adapts the workload over them in a way that is not suitable for just one physical HT processor. Could someone give advice on whether it's wise to enable HT-support in 6-STABLE? And, is the following correct: enabling SMP (=HT in this case?) is nothing more than adding "options SMP" to the kernel config file and then do a kernel rebuild & reinstall ? And what about the scheduler? Is the usage of ULE recommended, or should i stick the old one? (I can't find that much in the handbook about HT/SMP) thanks in advance for your time and help, Niek
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