Date: Wed, 14 Jan 2004 11:15:42 -0000 From: "Andrew Edwards (Olympic Shaver Centre)" <andrew@shavers.co.uk> To: <freebsd-current@freebsd.org> Subject: Hyperthreading with SMP in 5.2 Message-ID: <003c01c3da8f$c022a3e0$0b00a8c0@laptop>
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Hi, Could anyone clarify the level of support for Pentium 4 hyperthreading = in 5.2? I understand that the kernel is now smp aware by default but = does it handle the logical cpu's of hyperthreading in the same manner as = it would a physical cpu? I ask as for the best part my machine rarely goes above 50% cpu = utilisation. However using -j2 when building the kernel or world for = example will give me nearer full use, which I can appreciate as it = generates concurrent processes that likely get divided over the two = logical cpu. Not being fully aware of the technical bits to hyperthreading is the = above scenario as good as it can be and is making good use of the cpu, = i.e if I run a single cpu heavy process, whereas without hyperthreading = I would see 100% usage now I only see around 50%. Thanks.
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