Date: Wed, 28 Sep 2005 11:45:32 +0200 From: Marcin Jessa <lists@yazzy.org> To: Vladimir Grebenschikov <vova@sw.ru> Cc: acpi@freebsd.org, current@freebsd.org Subject: Re: Invalid detection CPU frequency ? Message-ID: <20050928114532.6ab80f6b.lists@yazzy.org> In-Reply-To: <1127890738.1220.5.camel@localhost> References: <1127801205.1268.9.camel@localhost> <4339D724.3020102@root.org> <1127890738.1220.5.camel@localhost>
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On Wed, 28 Sep 2005 10:58:58 +0400 Vladimir Grebenschikov <vova@sw.ru> wrote: > В вт, 27/09/2005 в 16:35 -0700, Nate Lawson пишет: > > Vladimir Grebenschikov wrote: > > > It looks strange but sometimes my notebook start on full-speed > > > (1.7GHz) and sysctls output looks like: > > > > > > dev.cpu.0.freq: 1687 > > > dev.cpu.0.freq_levels: 1687/-1 1476/-1 1265/-1 1054/-1 843/-1 > > > 632/-1 421/-1 210/-1 dev.acpi_throttle.0.%desc: ACPI CPU > > > Throttling > > > > > > And sometimes it starts on low speed (~500 Mhz) > > > dev.cpu.0.freq: 595 > > > dev.cpu.0.freq_levels: 595/-1 520/-1 446/-1 371/-1 297/-1 223/-1 > > > 148/-1 74/-1 dev.acpi_throttle.0.%desc: ACPI CPU Throttling > > > > > And speed can't be raised by powerd or other. > > > Looks like it happens when notebook stats or shutdowns on > > > batteries. Rebooting on AC power cures situation. But anyway - I > > > do not think it is normal. > > > > > > Any suggestions ? > > > > It's very simple. You have an old notebook that only supports > > throttling, not SpeedStep or other options. Your BIOS sets the > > initial speed based on AC line status on boot. If you look at your > > CPU announcement at the top of dmesg, it will show 595 Mhz or > > whatever since it uses a simple calibration loop. > > > > I might consider always setting 100% in the attach routine for > > acpi_throttle and p4tcc to get proper probe values. You'll still > > have a problem if you use the TSC timecounter since it's only > > calibrated at boot. > > Nate, thanks for explanation, is loading cpufreq.ko from loader is > good solution ? Or I will still have TSC problems ? I compiled it into my kernel which works fine on thinkpad R50e device cpufreq #CPU frequency control framework My entire setup can be found on: http://www.yazzy.org/configs/freebsd/thinkpad/ Cheers, Cheers, Marcin
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