Date: Mon, 08 Mar 2010 16:53:36 +0200 From: Alexander Motin <mav@FreeBSD.org> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-stable@freebsd.org Subject: Re: powerd on 8.0, is it considered safe? Message-ID: <4B950F70.8030601@FreeBSD.org> In-Reply-To: <1268058195.00227162.1268047203@10.7.7.3> References: <1268058181.00227122.1268045402@10.7.7.3> <1268058195.00227162.1268047203@10.7.7.3>
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Jeremy Chadwick wrote: > I should note that on RELENG_7, EIST/SpeedStep didn't appear to work > properly (cpufreq(4) driver reporting that the est piece wouldn't > attach), which historically (for me) has resulted in ACPI throttling > being done (which works). Based on the sysctl output below, I believe > acpi_perf is in use, but I'm not 100% certain. The man page doesn't > really disclose how to determine which driver is in use. > > The X7SBA system in question is below. Be aware I limit the lowest > clock frequency to 1500MHz using debug.cpufreq.lowest="1500" in > /boot/loader.conf, which is why you don't see anything lower in > freq_levels. > > dev.est.0.freq_settings: 3000/35000 2667/28000 2333/22000 2000/16000 This is the real set of EIST supported levels. > dev.cpu.0.freq_levels: 3000/35000 2667/28000 2333/22000 2041/19250 2000/16000 1750/14000 1500/12000 All the rest of these are throttling. I would recommend you to disable it by setting: hint.p4tcc.0.disabled=1 hint.acpi_throttle.0.disabled=1 -- Alexander Motin
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