Date: Tue, 28 Feb 2006 16:34:40 -0800 From: Nate Lawson <nate@root.org> To: Marcus Alves Grando <mnag@FreeBSD.org> Cc: FreeBSD Stable <freebsd-stable@FreeBSD.org> Subject: Re: sysctl: dev.cpu.0.freq: Device busy (cpufreq p4tcc / RELENG_6) Message-ID: <4404EC20.8030500@root.org> In-Reply-To: <4404E852.80908@FreeBSD.org> References: <4404E852.80908@FreeBSD.org>
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Marcus Alves Grando wrote: > I have problems in cpufreq in RELENG_6 (today). > > I try to set another frequency in my laptop and get this error: > > # sysctl dev.cpu.0.freq=250 > dev.cpu.0.freq: 2000 > sysctl: dev.cpu.0.freq: Device busy > > Timecounter "TSC" frequency 1995011972 Hz quality 800 > Timecounters tick every 1.000 msec Try setting your timecounter to acpi or i8254 (not TSC): sysctl kern.timecounter.hardware="acpi" Without complicated recalibration code (which no one has written yet), we can't base our system time off the TSC counter when cpufreq is changing it. -- Nate
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