Date: Thu, 5 May 2005 10:43:30 +0200 From: Anthony Atkielski <atkielski.anthony@wanadoo.fr> To: freebsd-questions@freebsd.org Subject: Re: Clock running fast Message-ID: <352039115.20050505104330@wanadoo.fr> In-Reply-To: <34d0f02f0868350c3c07570e3a73ceef@mac.com> References: <42792740.3040501@houston.rr.com> <34d0f02f0868350c3c07570e3a73ceef@mac.com>
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Charles Swiger writes: > Try changing the kern.timecounter.hardware sysctl; you can look at the > available choices via: > > sysctl kern.timecounter.choice So what do the choices mean? How are they used? On one machine, I see TSC, ACPI-fast, i8254, and dummy as choices, and ACPI-fast is selected (this is a P4 machine). On the other, older machine (a 2-processor Pentium Pro), I see TSC, i8254, and dummy, and i8254 is selected. I presume that TSC is a real-time clock based on the processor TSC, and I presume also that i8254 is such a clock based on the classic i8254 timer, but what is dummy, and what is ACPI-fast? What are the pros and cons of selecting different choices? -- Anthony
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