Date: Mon, 6 Feb 2006 17:08:02 +0300 From: Yar Tikhiy <yar@comp.chem.msu.su> To: current@freebsd.org Subject: Re: machdep.cpu_idle_hlt and SMP perf? Message-ID: <20060206140802.GB33939@comp.chem.msu.su> In-Reply-To: <20060204.085917.129781502.imp@bsdimp.com> References: <17379.56708.421007.613310@grasshopper.cs.duke.edu> <43E45BD8.7070708@fer.hr> <20060204.085917.129781502.imp@bsdimp.com>
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Here is my own observation related to this topic: With machdep.cpu_idle_hlt=1, both CURRENT and RELENG_6 inside MS Virtual Server 2005 show bogus CPU utilization, e.g., in top(1): the idle thread takes ~130% CPU (sic) and the clock thread takes another 40% CPU; the interrupt time is 20-30% while the system is idle. Setting machdep.cpu_idle_hlt=0 makes the CPU stats look sane. All this must be a bogosity in MS Virtual Server, but anyway machdep.cpu_idle_hlt is a knob to try when things get weird :-) -- Yar
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