Date: Mon, 8 Mar 2010 03:10:11 -0800 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: freebsd-stable@freebsd.org Subject: Re: powerd on 8.0, is it considered safe? Message-ID: <20100308111011.GA71267@icarus.home.lan> In-Reply-To: <cf9b1ee01003080247t9bb03c0n4b065884532ca1e9@mail.gmail.com> References: <cf9b1ee01003080247t9bb03c0n4b065884532ca1e9@mail.gmail.com>
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On Mon, Mar 08, 2010 at 12:47:37PM +0200, Dan Naumov wrote: > Is powerd finally considered stable and safe to use on 8.0? At least > on 7.2, it consistently caused panics when used on Atom systems with > Hyper-Threading enabled, but I recall that Attilio Rao was looking > into it. I didn't realise it was unsafe to use on RELENG_8 or RELENG_7...? I've been using powerd(8) without any problems on my Supermicro X7SBA system (CPU = Core2Duo E8400) for quite some time, including back to the RELENG_7 days. 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. $ uname -a FreeBSD icarus.home.lan 8.0-STABLE FreeBSD 8.0-STABLE #0: Mon Mar 1 11:51:38 PST 2010 root@icarus.home.lan:/usr/obj/usr/src/sys/X7SBA_RELENG_8_amd64 amd64 $ kenv | grep smbios.planar.product smbios.planar.product="X7SBA" $ uptime 3:00am up 6 days, 14:38, 1 user, load averages: 0.00, 0.00, 0.00 $ ps -auxwwww | grep powerd root 991 0.0 0.0 6836 1284 ?? Ss Mon12pm 2:42.21 /usr/sbin/powerd jdc 71353 0.0 0.0 9036 1524 0 S+ 3:00am 0:00.00 grep powerd $ sysctl dev.cpu dev.est dev.cpufreq dev.p4tcc debug.cpufreq kern.timecounter dev.cpu.0.%desc: ACPI CPU dev.cpu.0.%driver: cpu dev.cpu.0.%location: handle=\_PR_.CPU0 dev.cpu.0.%pnpinfo: _HID=none _UID=0 dev.cpu.0.%parent: acpi0 dev.cpu.0.temperature: 41.0C dev.cpu.0.freq: 1500 dev.cpu.0.freq_levels: 3000/35000 2667/28000 2333/22000 2041/19250 2000/16000 1750/14000 1500/12000 dev.cpu.0.cx_supported: C1/0 C2/85 dev.cpu.0.cx_lowest: C1 dev.cpu.0.cx_usage: 100.00% 0.00% last 500us dev.cpu.1.%desc: ACPI CPU dev.cpu.1.%driver: cpu dev.cpu.1.%location: handle=\_PR_.CPU1 dev.cpu.1.%pnpinfo: _HID=none _UID=0 dev.cpu.1.%parent: acpi0 dev.cpu.1.temperature: 41.0C dev.cpu.1.cx_supported: C1/0 C2/85 dev.cpu.1.cx_lowest: C1 dev.cpu.1.cx_usage: 100.00% 0.00% last 500us dev.est.0.%desc: Enhanced SpeedStep Frequency Control dev.est.0.%driver: est dev.est.0.%parent: cpu0 dev.est.0.freq_settings: 3000/35000 2667/28000 2333/22000 2000/16000 dev.est.1.%desc: Enhanced SpeedStep Frequency Control dev.est.1.%driver: est dev.est.1.%parent: cpu1 dev.est.1.freq_settings: 3000/35000 2667/28000 2333/22000 2000/16000 dev.cpufreq.0.%driver: cpufreq dev.cpufreq.0.%parent: cpu0 dev.cpufreq.1.%driver: cpufreq dev.cpufreq.1.%parent: cpu1 dev.p4tcc.0.%desc: CPU Frequency Thermal Control dev.p4tcc.0.%driver: p4tcc dev.p4tcc.0.%parent: cpu0 dev.p4tcc.0.freq_settings: 10000/-1 8750/-1 7500/-1 6250/-1 5000/-1 3750/-1 2500/-1 1250/-1 dev.p4tcc.1.%desc: CPU Frequency Thermal Control dev.p4tcc.1.%driver: p4tcc dev.p4tcc.1.%parent: cpu1 dev.p4tcc.1.freq_settings: 10000/-1 8750/-1 7500/-1 6250/-1 5000/-1 3750/-1 2500/-1 1250/-1 debug.cpufreq.verbose: 0 debug.cpufreq.lowest: 1500 kern.timecounter.tick: 1 kern.timecounter.choice: TSC(-100) ACPI-fast(1000) i8254(0) dummy(-1000000) kern.timecounter.hardware: ACPI-fast kern.timecounter.stepwarnings: 0 kern.timecounter.tc.i8254.mask: 65535 kern.timecounter.tc.i8254.counter: 7127 kern.timecounter.tc.i8254.frequency: 1193182 kern.timecounter.tc.i8254.quality: 0 kern.timecounter.tc.ACPI-fast.mask: 16777215 kern.timecounter.tc.ACPI-fast.counter: 3275901 kern.timecounter.tc.ACPI-fast.frequency: 3579545 kern.timecounter.tc.ACPI-fast.quality: 1000 kern.timecounter.tc.TSC.mask: 4294967295 kern.timecounter.tc.TSC.counter: 1458979861 kern.timecounter.tc.TSC.frequency: 2992512852 kern.timecounter.tc.TSC.quality: -100 kern.timecounter.smp_tsc: 0 kern.timecounter.invariant_tsc: 1 -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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