Date: Wed, 28 Sep 2005 10:58:58 +0400 From: Vladimir Grebenschikov <vova@sw.ru> To: Nate Lawson <nate@root.org> Cc: acpi@freebsd.org, current <current@freebsd.org> Subject: Re: Invalid detection CPU frequency ? Message-ID: <1127890738.1220.5.camel@localhost> In-Reply-To: <4339D724.3020102@root.org> References: <1127801205.1268.9.camel@localhost> <4339D724.3020102@root.org>
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=F7 =D7=D4, 27/09/2005 =D7 16:35 -0700, Nate Lawson =D0=C9=DB=C5=D4: > Vladimir Grebenschikov wrote: > > It looks strange but sometimes my notebook start on full-speed (1.7GHz) > > and sysctls output looks like: > >=20 > > dev.cpu.0.freq: 1687 > > dev.cpu.0.freq_levels: 1687/-1 1476/-1 1265/-1 1054/-1 843/-1 632/-1 42= 1/-1 210/-1 > > dev.acpi_throttle.0.%desc: ACPI CPU Throttling > >=20 > > 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 >=20 > > 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 i= s normal. > >=20 > > Any suggestions ?=20 >=20 > It's very simple. You have an old notebook that only supports=20 > throttling, not SpeedStep or other options. Your BIOS sets the initial=20 > speed based on AC line status on boot. If you look at your CPU=20 > announcement at the top of dmesg, it will show 595 Mhz or whatever since=20 > it uses a simple calibration loop. >=20 > I might consider always setting 100% in the attach routine for=20 > acpi_throttle and p4tcc to get proper probe values. You'll still have a=20 > 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 ?=20 --=20 Vladimir B. Grebenschikov SWsoft Inc. vova@swsoft.com
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