Jakub Lach
2016-Nov-26 04:16 UTC
Bogus turbo mode with Intel(R) Core(TM)2 Duo CPU P9700 (2.80GHz)
Hello, Since I'm running this CPU, I've noticed there is additional field in supported frequency (under heavy load)- dev.cpu.0.cx_supported: C1/1/1 C2/2/1 C3/3/57 dev.cpu.0.freq_levels: 2801/35000 2800/35000 2450/30625 2133/23888 1866/20902 1600/15000 1400/13125 1200/11250 1000/9375 800/12000 700/10500 600/9000 500/7500 400/6000 300/4500 200/3000 100/1500 dev.cpu.0.freq: 2801 dev.cpu.0.temperature: 67,0C as far as I know, the +1 MHz mode is a turbo boost factory overclock, however this CPU does not support it. Anybody knows what's going on? I've previously had T9400 (2.53 GHz), there was no such thing listed and it was running slightly cooler under load, despite having higher TDP (however P9700 is a lot cooler when idle, as expected). Still, I don't think it is possible it's actually being overclocked? -- View this message in context: http://freebsd.1045724.x6.nabble.com/Bogus-turbo-mode-with-Intel-R-Core-TM-2-Duo-CPU-P9700-2-80GHz-tp6147461.html Sent from the freebsd-stable mailing list archive at Nabble.com.
Adrian Chadd
2016-Nov-26 04:40 UTC
Bogus turbo mode with Intel(R) Core(TM)2 Duo CPU P9700 (2.80GHz)
the acpi cpu frequency module just exposes the frequency lis given to it by ACPI. If your ACPI table exposes the turbo boost frequency but doesn't implement it on the backend, FreeBSD doesn't know. We just obey what we're told. :) -a On 25 November 2016 at 20:16, Jakub Lach <jakub_lach at mailplus.pl> wrote:> Hello, > > Since I'm running this CPU, I've noticed there is additional > field in supported frequency (under heavy load)- > > dev.cpu.0.cx_supported: C1/1/1 C2/2/1 C3/3/57 > dev.cpu.0.freq_levels: 2801/35000 2800/35000 2450/30625 2133/23888 > 1866/20902 1600/15000 1400/13125 1200/11250 1000/9375 800/12000 700/10500 > 600/9000 500/7500 400/6000 300/4500 200/3000 100/1500 > dev.cpu.0.freq: 2801 > dev.cpu.0.temperature: 67,0C > > as far as I know, the +1 MHz mode is a turbo boost factory > overclock, however this CPU does not support it. Anybody knows > what's going on? > > I've previously had T9400 (2.53 GHz), there was no such thing listed > and it was running slightly cooler under load, despite having higher > TDP (however P9700 is a lot cooler when idle, as expected). > > Still, I don't think it is possible it's actually being overclocked? > > > > -- > View this message in context: http://freebsd.1045724.x6.nabble.com/Bogus-turbo-mode-with-Intel-R-Core-TM-2-Duo-CPU-P9700-2-80GHz-tp6147461.html > Sent from the freebsd-stable mailing list archive at Nabble.com. > _______________________________________________ > freebsd-stable at freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe at freebsd.org"
Jakub Lach
2016-Nov-26 04:50 UTC
Odp: Re: Bogus turbo mode with Intel(R) Core(TM)2 Duo CPU P9700 (2.80GHz)
Thanks for reply! If I've understood you correctly, that means the
ACPI? table somehow provides (lists) turbo mode for this CPU even though it
does not support it [1]? Is there a way to check it's real speed under
load? I'm guessing no. [1] ark.intel.com ark.intel.com
Dnia 26 listopada 2016 05:40 Adrian Chadd <adrian.chadd
at gmail.com> napisa?(a):
the acpi cpu frequency module just exposes the frequency lis
given to
it by ACPI. If your ACPI table exposes the turbo boost frequency but
doesn't implement it on the backend, FreeBSD doesn't know. We
just
obey what we're told. :)
-a
On 25 November 2016 at 20:16, Jakub Lach <jakub_lach at
mailplus.pl> wrote:
Hello,
Since I'm running this CPU, I've noticed there is additional
field in supported frequency (under heavy load)-
dev.cpu.0.cx_supported: C1/1/1 C2/2/1 C3/3/57
dev.cpu.0.freq_levels: 2801/35000 2800/35000 2450/30625 2133/23888
1866/20902 1600/15000 1400/13125 1200/11250 1000/9375 800/12000 700/10500
600/9000 500/7500 400/6000 300/4500 200/3000 100/1500
dev.cpu.0.freq: 2801
dev.cpu.0.temperature: 67,0C
as far as I know, the +1 MHz mode is a turbo boost factory
overclock, however this CPU does not support it. Anybody knows
what's going on?
I've previously had T9400 (2.53 GHz), there was no such thing listed
and it was running slightly cooler under load, despite having higher
TDP (however P9700 is a lot cooler when idle, as expected).
Still, I don't think it is possible it's actually being
overclocked?
--
View this message in context: freebsd.1045724.x6.nabble.com
freebsd.1045724.x6.nabble.com
Sent from the freebsd-stable mailing list archive at Nabble.com.
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Ian Smith
2016-Nov-26 13:17 UTC
Bogus turbo mode with Intel(R) Core(TM)2 Duo CPU P9700 (2.80GHz)
On Fri, 25 Nov 2016 21:16:11 -0700, Jakub Lach wrote: > Hello, Hi. Replying to this 'cos your later response to Adrian got .. nobbled. > Since I'm running this CPU, I've noticed there is additional > field in supported frequency (under heavy load)- > > dev.cpu.0.cx_supported: C1/1/1 C2/2/1 C3/3/57 > dev.cpu.0.freq_levels: 2801/35000 2800/35000 2450/30625 2133/23888 > 1866/20902 1600/15000 1400/13125 1200/11250 1000/9375 800/12000 700/10500 > 600/9000 500/7500 400/6000 300/4500 200/3000 100/1500 > dev.cpu.0.freq: 2801 > dev.cpu.0.temperature: 67,0C > > as far as I know, the +1 MHz mode is a turbo boost factory > overclock, however this CPU does not support it. Anybody knows > what's going on? > > I've previously had T9400 (2.53 GHz), there was no such thing listed > and it was running slightly cooler under load, despite having higher > TDP (however P9700 is a lot cooler when idle, as expected). > > Still, I don't think it is possible it's actually being overclocked? My X200 has an Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz, less than a year older than yours, still Penryn. Last time I explored this on the Intel site it didn't do Turbo Boost as such but it did do some earlier version of that; sorry I forget its name or details, and ark.intel.com seems different from what I found then. No time to hunt now. In a message to freebsd-mobile@ on 4 Feb 2015, in response to mine Warner Losh advised: > > On my X200 it's '2401/35000 2400/35000 1600/15000 800/12000' and I > > found hiadaptive rather aggressive, where adaptive works fine for > > my use - but of course everybody's use is different :) > > > > powerd_flags="-a adp -b adp -i 70 -r 90" > > The X+1 number (in this case 2401) is the turbo-mode speed. If you > use X, it disables the Turbo mode which causes the CPU to run faster > until it gets too hot. On my T400, I found that if I limit powerd to > X instead of X+1, I have fewer heat related issues when Im doing > things like building a kernel > > Warner So I've run powerd with flag '-M 2400' since without issue either way. But then, I'm doing many timing runs where consistent CPU speed at load is a virtue, and I recall it definitly ran somewhat cooler at full load. Not that 67C is particularly hot; running say sysutils/stress with '-c 4 -t 20m' gets my X200 to >80C in warmer weather, but the fan holds it ok. cheers, Ian