Core 2 Duo Merom speedstep on 2.6.18

Core 2 Duo Merom speedstep on 2.6.18

[Johannes Petersson]

Hello

I've been struggling a while to get speedstepping to work correctly on a 
Core 2 Duo T7200 2Ghz (merom) processor with the 2.6.18 kernel. First I 
tried it on the 2.6.15.27 kernel, then I got recommended to try the 2.6.18 
but I have the same problem on the latter kernel as well.

With the acpi-cpufreq module everything seems to work, the
/sys/devices/system/cpu/cpu0(1)/cpufreq/
folders gets populated but the thing is that the 
scaling_available_frequencies file only contains the following available 
speedstepping frequenzies:
1200000 1000000 800000 600000
And the cpuinfo_max_freq only contains:
1200000
Which is not true, the processor has a max speed of 2 Ghz.

When I start two burnP6 instances the processor scales from 600000 to 
1200000 according to the scaling_cur_freq file.

If I instead try to load the speedstep-centrino module I get the following 
errors:
modprobe -v speedstep-centrino
insmod 
/lib/modules/2.6.18-686/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.ko
FATAL: Error inserting speedstep_centrino 
(/lib/modules/2.6.18-686/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.ko): 
No such device

But from what I read in the archives the speedstep-centrino is deprecated 
and all its functionallity is included in acpi-cpufreq in the 2.6.18 kernel.

So is there anyone that has a solution to get a C2D Merom T7200 processor to 
speedstep up to it's full speed??

Here is /proc/cpuinfo during full load, this also shows 1.2 GHz

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 15
model name	: Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
stepping	: 6
cpu MHz		: 1200.000
cache size	: 4096 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 2
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 10
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat 
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pni 
monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
bogomips	: 3986.98

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 15
model name	: Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
stepping	: 6
cpu MHz		: 1200.000
cache size	: 4096 KB
physical id	: 0
siblings	: 2
core id		: 1
cpu cores	: 2
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 10
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat 
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pni 
monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
bogomips	: 3983.93

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Re: Core 2 Duo Merom speedstep on 2.6.18

[Alexey Starikovskiy]

Hi Johannes,
acpi_cpufreq gets its frequencies from ACPI tables exported by BIOS,
so if you see wrong values -- it's BIOS bug, try to get proper BIOS
from your notebook/mainboard vendor.
On the other hand, lowest freq for Pentium M derivatives is 6 * FSB.
So either your BIOS set FSB to 100Mhz, or it forget to change FSB freq for
Merom (should be 166Mhz) -> 1200*1.66 => 2000 you are looking for.
This means that cpufreq framework is working properly even if you don't see
right numbers.

Anyway, update your BIOS! :)

Regards,
	Alex.

Johannes Petersson wrote:
> Hello
> 
> I've been struggling a while to get speedstepping to work correctly on a
> Core 2 Duo T7200 2Ghz (merom) processor with the 2.6.18 kernel. First I
> tried it on the 2.6.15.27 kernel, then I got recommended to try the
> 2.6.18 but I have the same problem on the latter kernel as well.
> 
> With the acpi-cpufreq module everything seems to work, the
> /sys/devices/system/cpu/cpu0(1)/cpufreq/
> folders gets populated but the thing is that the
> scaling_available_frequencies file only contains the following available
> speedstepping frequenzies:
> 1200000 1000000 800000 600000
> And the cpuinfo_max_freq only contains:
> 1200000
> Which is not true, the processor has a max speed of 2 Ghz.
> 
> When I start two burnP6 instances the processor scales from 600000 to
> 1200000 according to the scaling_cur_freq file.
> 
> If I instead try to load the speedstep-centrino module I get the
> following errors:
> modprobe -v speedstep-centrino
> insmod
> /lib/modules/2.6.18-686/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.ko
> 
> FATAL: Error inserting speedstep_centrino
> (/lib/modules/2.6.18-686/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.ko):
> No such device
> 
> But from what I read in the archives the speedstep-centrino is
> deprecated and all its functionallity is included in acpi-cpufreq in the
> 2.6.18 kernel.
> 
> So is there anyone that has a solution to get a C2D Merom T7200
> processor to speedstep up to it's full speed??
> 
> Here is /proc/cpuinfo during full load, this also shows 1.2 GHz
> 
> processor    : 0
> vendor_id    : GenuineIntel
> cpu family    : 6
> model        : 15
> model name    : Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
> stepping    : 6
> cpu MHz        : 1200.000
> cache size    : 4096 KB
> physical id    : 0
> siblings    : 2
> core id        : 0
> cpu cores    : 2
> fdiv_bug    : no
> hlt_bug        : no
> f00f_bug    : no
> coma_bug    : no
> fpu        : yes
> fpu_exception    : yes
> cpuid level    : 10
> wp        : yes
> flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
> cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm
> constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
> bogomips    : 3986.98
> 
> processor    : 1
> vendor_id    : GenuineIntel
> cpu family    : 6
> model        : 15
> model name    : Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
> stepping    : 6
> cpu MHz        : 1200.000
> cache size    : 4096 KB
> physical id    : 0
> siblings    : 2
> core id        : 1
> cpu cores    : 2
> fdiv_bug    : no
> hlt_bug        : no
> f00f_bug    : no
> coma_bug    : no
> fpu        : yes
> fpu_exception    : yes
> cpuid level    : 10
> wp        : yes
> flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
> cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm
> constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
> bogomips    : 3983.93
> 
> _________________________________________________________________
> Express yourself instantly with MSN Messenger! Download today it's FREE!
> http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
> 
> 
> _______________________________________________
> Cpufreq mailing list
> Cpufreq@lists.linux.org.uk
> http://lists.linux.org.uk/mailman/listinfo/cpufreq

Re: Core 2 Duo Merom speedstep on 2.6.18

[Johannes Petersson]

Hi, thank you for your answer

I was guessing that it worked properly, cause I've got a wattmeter and 
during idle it shows about 53 watts and with two instances of burnP6 it goes 
upp to 84 watts with the acpi_cpufreq loaded. And when I don't have acpi_cpu 
freq loaded /proc/cpuinfo shows the correct 2 Ghz but the computer still 
draws the same 53 watts in idle and 84 watts with burnP6.

I've also been experimenting with the DSDT of the bios and when I compiled 
it with the iasl compiler from intel it gave me 3 errors which I corrected 
but that didn't help much for this problem.

What I was hoping for is that I could use the speedstep_centrino module and 
that it didn't get its frequencies from the bios.

But for now, until I can get MSI to give me an update to their bios for the 
Speedster mainboard I have to be happy that it's just the wrong numbers 
that's beeing reported.

Sincerely,
  Johannes Petersson


>From: Alexey Starikovskiy <alexey_y_starikovskiy@linux.intel.com>
>To: Johannes Petersson <my_reflection@hotmail.com>
>CC: cpufreq@lists.linux.org.uk
>Subject: Re: Core 2 Duo Merom speedstep on 2.6.18
>Date: Tue, 10 Oct 2006 15:23:32 +0400
>
>Hi Johannes,
>acpi_cpufreq gets its frequencies from ACPI tables exported by BIOS,
>so if you see wrong values -- it's BIOS bug, try to get proper BIOS
>from your notebook/mainboard vendor.
>On the other hand, lowest freq for Pentium M derivatives is 6 * FSB.
>So either your BIOS set FSB to 100Mhz, or it forget to change FSB freq for
>Merom (should be 166Mhz) -> 1200*1.66 => 2000 you are looking for.
>This means that cpufreq framework is working properly even if you don't see
>right numbers.
>
>Anyway, update your BIOS! :)
>
>Regards,
>	Alex.
>
>Johannes Petersson wrote:
> > Hello
> >
> > I've been struggling a while to get speedstepping to work correctly on a
> > Core 2 Duo T7200 2Ghz (merom) processor with the 2.6.18 kernel. First I
> > tried it on the 2.6.15.27 kernel, then I got recommended to try the
> > 2.6.18 but I have the same problem on the latter kernel as well.
> >
> > With the acpi-cpufreq module everything seems to work, the
> > /sys/devices/system/cpu/cpu0(1)/cpufreq/
> > folders gets populated but the thing is that the
> > scaling_available_frequencies file only contains the following available
> > speedstepping frequenzies:
> > 1200000 1000000 800000 600000
> > And the cpuinfo_max_freq only contains:
> > 1200000
> > Which is not true, the processor has a max speed of 2 Ghz.
> >
> > When I start two burnP6 instances the processor scales from 600000 to
> > 1200000 according to the scaling_cur_freq file.
> >
> > If I instead try to load the speedstep-centrino module I get the
> > following errors:
> > modprobe -v speedstep-centrino
> > insmod
> > 
>/lib/modules/2.6.18-686/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.ko
> >
> > FATAL: Error inserting speedstep_centrino
> > 
>(/lib/modules/2.6.18-686/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.ko):
> > No such device
> >
> > But from what I read in the archives the speedstep-centrino is
> > deprecated and all its functionallity is included in acpi-cpufreq in the
> > 2.6.18 kernel.
> >
> > So is there anyone that has a solution to get a C2D Merom T7200
> > processor to speedstep up to it's full speed??
> >
> > Here is /proc/cpuinfo during full load, this also shows 1.2 GHz
> >
> > processor    : 0
> > vendor_id    : GenuineIntel
> > cpu family    : 6
> > model        : 15
> > model name    : Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
> > stepping    : 6
> > cpu MHz        : 1200.000
> > cache size    : 4096 KB
> > physical id    : 0
> > siblings    : 2
> > core id        : 0
> > cpu cores    : 2
> > fdiv_bug    : no
> > hlt_bug        : no
> > f00f_bug    : no
> > coma_bug    : no
> > fpu        : yes
> > fpu_exception    : yes
> > cpuid level    : 10
> > wp        : yes
> > flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
> > cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm
> > constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
> > bogomips    : 3986.98
> >
> > processor    : 1
> > vendor_id    : GenuineIntel
> > cpu family    : 6
> > model        : 15
> > model name    : Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
> > stepping    : 6
> > cpu MHz        : 1200.000
> > cache size    : 4096 KB
> > physical id    : 0
> > siblings    : 2
> > core id        : 1
> > cpu cores    : 2
> > fdiv_bug    : no
> > hlt_bug        : no
> > f00f_bug    : no
> > coma_bug    : no
> > fpu        : yes
> > fpu_exception    : yes
> > cpuid level    : 10
> > wp        : yes
> > flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
> > cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm
> > constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
> > bogomips    : 3983.93
> >
> > _________________________________________________________________
> > Express yourself instantly with MSN Messenger! Download today it's FREE!
> > http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
> >
> >
> > _______________________________________________
> > Cpufreq mailing list
> > Cpufreq@lists.linux.org.uk
> > http://lists.linux.org.uk/mailman/listinfo/cpufreq

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Re: Core 2 Duo Merom speedstep on 2.6.18

[Johannes Petersson]

Hello again

Just wanted to let people know that MSI finally got around to releasing an 
updated bios after a lot of mailing to support. The new bios (v1.20 from 
oktober 2006) doesn't seem to have any problems with speedstepping.

Regards,
  Johannes Petersson


>From: "Johannes Petersson" <my_reflection@hotmail.com>
>To: alexey_y_starikovskiy@linux.intel.com
>CC: cpufreq@lists.linux.org.uk
>Subject: Re: Core 2 Duo Merom speedstep on 2.6.18
>Date: Tue, 10 Oct 2006 14:20:46 +0200
>
>Hi, thank you for your answer
>
>I was guessing that it worked properly, cause I've got a wattmeter and 
>during idle it shows about 53 watts and with two instances of burnP6 it 
>goes upp to 84 watts with the acpi_cpufreq loaded. And when I don't have 
>acpi_cpu freq loaded /proc/cpuinfo shows the correct 2 Ghz but the computer 
>still draws the same 53 watts in idle and 84 watts with burnP6.
>
>I've also been experimenting with the DSDT of the bios and when I compiled 
>it with the iasl compiler from intel it gave me 3 errors which I corrected 
>but that didn't help much for this problem.
>
>What I was hoping for is that I could use the speedstep_centrino module and 
>that it didn't get its frequencies from the bios.
>
>But for now, until I can get MSI to give me an update to their bios for the 
>Speedster mainboard I have to be happy that it's just the wrong numbers 
>that's beeing reported.
>
>Sincerely,
>  Johannes Petersson
>
>
>>From: Alexey Starikovskiy <alexey_y_starikovskiy@linux.intel.com>
>>To: Johannes Petersson <my_reflection@hotmail.com>
>>CC: cpufreq@lists.linux.org.uk
>>Subject: Re: Core 2 Duo Merom speedstep on 2.6.18
>>Date: Tue, 10 Oct 2006 15:23:32 +0400
>>
>>Hi Johannes,
>>acpi_cpufreq gets its frequencies from ACPI tables exported by BIOS,
>>so if you see wrong values -- it's BIOS bug, try to get proper BIOS
>>from your notebook/mainboard vendor.
>>On the other hand, lowest freq for Pentium M derivatives is 6 * FSB.
>>So either your BIOS set FSB to 100Mhz, or it forget to change FSB freq for
>>Merom (should be 166Mhz) -> 1200*1.66 => 2000 you are looking for.
>>This means that cpufreq framework is working properly even if you don't 
>>see
>>right numbers.
>>
>>Anyway, update your BIOS! :)
>>
>>Regards,
>>	Alex.
>>
>>Johannes Petersson wrote:
>> > Hello
>> >
>> > I've been struggling a while to get speedstepping to work correctly on 
>>a
>> > Core 2 Duo T7200 2Ghz (merom) processor with the 2.6.18 kernel. First I
>> > tried it on the 2.6.15.27 kernel, then I got recommended to try the
>> > 2.6.18 but I have the same problem on the latter kernel as well.
>> >
>> > With the acpi-cpufreq module everything seems to work, the
>> > /sys/devices/system/cpu/cpu0(1)/cpufreq/
>> > folders gets populated but the thing is that the
>> > scaling_available_frequencies file only contains the following 
>>available
>> > speedstepping frequenzies:
>> > 1200000 1000000 800000 600000
>> > And the cpuinfo_max_freq only contains:
>> > 1200000
>> > Which is not true, the processor has a max speed of 2 Ghz.
>> >
>> > When I start two burnP6 instances the processor scales from 600000 to
>> > 1200000 according to the scaling_cur_freq file.
>> >
>> > If I instead try to load the speedstep-centrino module I get the
>> > following errors:
>> > modprobe -v speedstep-centrino
>> > insmod
>> > 
>>/lib/modules/2.6.18-686/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.ko
>> >
>> > FATAL: Error inserting speedstep_centrino
>> > 
>>(/lib/modules/2.6.18-686/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.ko):
>> > No such device
>> >
>> > But from what I read in the archives the speedstep-centrino is
>> > deprecated and all its functionallity is included in acpi-cpufreq in 
>>the
>> > 2.6.18 kernel.
>> >
>> > So is there anyone that has a solution to get a C2D Merom T7200
>> > processor to speedstep up to it's full speed??
>> >
>> > Here is /proc/cpuinfo during full load, this also shows 1.2 GHz
>> >
>> > processor    : 0
>> > vendor_id    : GenuineIntel
>> > cpu family    : 6
>> > model        : 15
>> > model name    : Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
>> > stepping    : 6
>> > cpu MHz        : 1200.000
>> > cache size    : 4096 KB
>> > physical id    : 0
>> > siblings    : 2
>> > core id        : 0
>> > cpu cores    : 2
>> > fdiv_bug    : no
>> > hlt_bug        : no
>> > f00f_bug    : no
>> > coma_bug    : no
>> > fpu        : yes
>> > fpu_exception    : yes
>> > cpuid level    : 10
>> > wp        : yes
>> > flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
>> > cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm
>> > constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
>> > bogomips    : 3986.98
>> >
>> > processor    : 1
>> > vendor_id    : GenuineIntel
>> > cpu family    : 6
>> > model        : 15
>> > model name    : Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
>> > stepping    : 6
>> > cpu MHz        : 1200.000
>> > cache size    : 4096 KB
>> > physical id    : 0
>> > siblings    : 2
>> > core id        : 1
>> > cpu cores    : 2
>> > fdiv_bug    : no
>> > hlt_bug        : no
>> > f00f_bug    : no
>> > coma_bug    : no
>> > fpu        : yes
>> > fpu_exception    : yes
>> > cpuid level    : 10
>> > wp        : yes
>> > flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
>> > cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm
>> > constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
>> > bogomips    : 3983.93
>> >
>> > _________________________________________________________________
>> > Express yourself instantly with MSN Messenger! Download today it's 
>>FREE!
>> > http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
>> >
>> >
>> > _______________________________________________
>> > Cpufreq mailing list
>> > Cpufreq@lists.linux.org.uk
>> > http://lists.linux.org.uk/mailman/listinfo/cpufreq
>
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