2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[bert hubert]

Hi everybody,

Since 2.6.18-rc1, up to and including -rc3, cpufreq has died on me. It
worked fine in 2.6.16.9.

The whole cpufreq hierarchy in /sys/ is missing, nothing is reported during
bootup mentioning 'cpufreq', and when I build with all the cpufreq stuff
configured as modules, I see this:

$ lsmod
Module                  Size  Used by
capability              3464  0
commoncap               5120  1 capability
acpi_cpufreq            4748  0
speedstep_lib           3716  0
cpufreq_userspace       3092  0
cpufreq_stats           3588  0
freq_table              3588  2 acpi_cpufreq,cpufreq_stats
cpufreq_powersave       1664  0
cpufreq_ondemand        4716  0
cpufreq_conservative     5280  0
b2c2_flexcop_pci        6936  0
b2c2_flexcop           22412  1 b2c2_flexcop_pci
mt352                   5636  1 b2c2_flexcop
mt312                   6660  1 b2c2_flexcop
bcm3510                 8196  1 b2c2_flexcop
stv0299                 8840  1 b2c2_flexcop
stv0297                 6272  1 b2c2_flexcop
nxt200x                11396  1 b2c2_flexcop
lgdt330x                7196  1 b2c2_flexcop
psmouse                31624  0

# modprobe p4_clockmod
FATAL: Error inserting p4_clockmod
(/lib/modules/2.6.18-rc3/kernel/arch/i386/kernel/cpu/cpufreq/p4-clockmod.ko):
Device or resource busy

dmesg is silent on why this is. I've grepped the files in the cpufreq
directory, but none of them contain EBUSY.

Under 2.6.16.9, this was logged at startup:
[17179582.044000] p4-clockmod: P4/Xeon(TM) CPU On-Demand Clock Modulation
available

cpuinfo:
$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      : Intel(R) Pentium(R) 4 CPU 3.00GHz
stepping        : 1
cpu MHz         : 3000.298
cache size      : 1024 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
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
constant_tsc pni monitor ds_cpl cid xtpr
bogomips        : 6004.95

>From .config:

#
# CPU Frequency scaling
#
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_TABLE=m
# CONFIG_CPU_FREQ_DEBUG is not set
CONFIG_CPU_FREQ_STAT=m
# CONFIG_CPU_FREQ_STAT_DETAILS is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=m
CONFIG_CPU_FREQ_GOV_USERSPACE=m
CONFIG_CPU_FREQ_GOV_ONDEMAND=m
CONFIG_CPU_FREQ_GOV_CONSERVATIVE=m

#
# CPUFreq processor drivers
#
CONFIG_X86_ACPI_CPUFREQ=m
CONFIG_X86_POWERNOW_K6=m
CONFIG_X86_POWERNOW_K7=m
CONFIG_X86_POWERNOW_K7_ACPI=y
CONFIG_X86_POWERNOW_K8=m
CONFIG_X86_POWERNOW_K8_ACPI=y
CONFIG_X86_GX_SUSPMOD=m
CONFIG_X86_SPEEDSTEP_CENTRINO=m
CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI=y
CONFIG_X86_SPEEDSTEP_CENTRINO_TABLE=y
CONFIG_X86_SPEEDSTEP_ICH=m
CONFIG_X86_SPEEDSTEP_SMI=m
CONFIG_X86_P4_CLOCKMOD=m
CONFIG_X86_CPUFREQ_NFORCE2=m
CONFIG_X86_LONGRUN=m

dmesg output is on http://ds9a.nl/tmp/dmesg , full .config on
http://ds9a.nl/config

Please let me know how I can help solve this problem. Zwane, you are welcome
to ssh to my system if that helps, let me know.

Kind regards,

bert



-- 
http://www.PowerDNS.com      Open source, database driven DNS Software 
http://netherlabs.nl              Open and Closed source services

Re: 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[Tomasz Torcz]

[-- Attachment #1: Type: text/plain, Size: 620 bytes --]

On Sun, Jul 30, 2006 at 02:08:44PM +0200, bert hubert wrote:
> Hi everybody,
> 
> Since 2.6.18-rc1, up to and including -rc3, cpufreq has died on me. It
> worked fine in 2.6.16.9.
> 
> # modprobe p4_clockmod
> FATAL: Error inserting p4_clockmod
> (/lib/modules/2.6.18-rc3/kernel/arch/i386/kernel/cpu/cpufreq/p4-clockmod.ko):
> Device or resource busy
> 

  I have similar problem with cpufreq-nforce2 -- http://lkml.org/lkml/2006/7/7/234
  I haven't do a git-bisect yet.

-- 
Tomasz Torcz                 "God, root, what's the difference?"
zdzichu@irc.-nie.spam-.pl         "God is more forgiving."


[-- Attachment #2: Type: application/pgp-signature, Size: 229 bytes --]

Re: 2.6.17 -> 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[bert hubert]

>   I have similar problem with cpufreq-nforce2 -- http://lkml.org/lkml/2006/7/7/234
>   I haven't do a git-bisect yet.

To recap, cpufreq died for at least two people (Tomasz Torcz and me) between
2.6.17 and 2.6.18-rc1. I've cc'd everybody who touched cpufreq according to
the shortlog.

Abundant details are in:

http://lkml.org/lkml/2006/7/30/87

New information is that I've narrowed it down from between 2.6.16.9 and
2.6.18-rc1 to between 2.6.17.7 (which works) and 2.6.18-rc1 (which doesn't).

The problem exists both with cpufreq as modules and staticly, and both with
P4 and nforce2.

Please let me know how I can help you solve this problem. I'll try a git
bisect but a lot of the cpufreq changes appear to be interrelated, so I'm
unsure if it will work.

Thanks!

-- 
http://www.PowerDNS.com      Open source, database driven DNS Software 
http://netherlabs.nl              Open and Closed source services

Re: 2.6.17 -> 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[Alexey Starikovskiy]

Do I understand your logs right and acpi-cpufreq is already loaded and works on your processor?
Do you have any info in /sys/devices/system/cpu/cpu0/cpufreq ?
Why do you want to load p4-clockmod over it? It does not save you any power, just limits performance.

Regards,
	Alex.

bert hubert wrote:
>>   I have similar problem with cpufreq-nforce2 -- http://lkml.org/lkml/2006/7/7/234
>>   I haven't do a git-bisect yet.
> 
> To recap, cpufreq died for at least two people (Tomasz Torcz and me) between
> 2.6.17 and 2.6.18-rc1. I've cc'd everybody who touched cpufreq according to
> the shortlog.
> 
> Abundant details are in:
> 
> http://lkml.org/lkml/2006/7/30/87
> 
> New information is that I've narrowed it down from between 2.6.16.9 and
> 2.6.18-rc1 to between 2.6.17.7 (which works) and 2.6.18-rc1 (which doesn't).
> 
> The problem exists both with cpufreq as modules and staticly, and both with
> P4 and nforce2.
> 
> Please let me know how I can help you solve this problem. I'll try a git
> bisect but a lot of the cpufreq changes appear to be interrelated, so I'm
> unsure if it will work.
> 
> Thanks!
> 

Re: 2.6.17 -> 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[bert hubert]

On Sun, Jul 30, 2006 at 10:07:18PM +0400, Alexey Starikovskiy wrote:
> Do I understand your logs right and acpi-cpufreq is already loaded and 
> works on your processor?

Yes, I can load it, but I'm unable to figure out what it is supposed to do,
or if it is doing anything.

> Do you have any info in /sys/devices/system/cpu/cpu0/cpufreq ?

No, not with just acpi-cpufreq loaded. With the help of Zwane, I've
discovered that if I unload acpi-cpufreq, I *can* load p4-clockmod, and then
the directory you mention appears, and I can configure governors, and life
is good. This all on 2.6.18-rc3.

Do I understand correctly that acpi-cpufreq is supposed to offer comparable
features?

Perhaps acpi-cpufreq *has* loaded, but did not find the proper hooks, but
has now registered itself, thus blocking p4-clockmod? When everything is
in-kernel, acpi-cpufreq might register itself first, which would lead to the
same thing.

For completeness, lspci. This is a desktop system, but I need some kind of
governer for quiet running.

$ lspci
0000:00:00.0 Host bridge: Intel Corporation 915G/P/GV/GL/PL/910GL Processor to I/O Controller (rev 04)
0000:00:01.0 PCI bridge: Intel Corporation 915G/P/GV/GL/PL/910GL PCI Express Root Port (rev 04)
0000:00:02.0 VGA compatible controller: Intel Corporation 82915G/GV/910GL Express Chipset Family Graphics Controller (rev 04)
0000:00:1b.0 0403: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 03)
0000:00:1c.0 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 1 (rev 03)
0000:00:1c.1 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 2 (rev 03)
0000:00:1c.2 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 3 (rev 03)
0000:00:1c.3 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 4 (rev 03)
0000:00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #1 (rev 03)
0000:00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #2 (rev 03)
0000:00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #3 (rev 03)
0000:00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #4 (rev 03)
0000:00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB2 EHCI Controller (rev 03)
0000:00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d3)
0000:00:1f.0 ISA bridge: Intel Corporation 82801FB/FR (ICH6/ICH6R) LPC Interface Bridge (rev 03)
0000:00:1f.1 IDE interface: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) IDE Controller (rev 03)
0000:00:1f.2 IDE interface: Intel Corporation 82801FB/FW (ICH6/ICH6W) SATA Controller (rev 03)0000:00:1f.3 SMBus: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) SMBus Controller (rev 03)
0000:06:00.0 Network controller: Techsan Electronics Co Ltd B2C2 FlexCopII DVB chip / Technisat SkyStar2 DVB card (rev 02)
0000:06:08.0 Ethernet controller: Intel Corporation 82562ET/EZ/GT/GZ - PRO/100 VE (LOM) Ethernet Controller (rev 01)

Thanks!

-- 
http://www.PowerDNS.com      Open source, database driven DNS Software 
http://netherlabs.nl              Open and Closed source services

Re: 2.6.17 -> 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[Dave Jones]

On Sun, Jul 30, 2006 at 08:44:43PM +0200, bert hubert wrote:
 
 > > Do you have any info in /sys/devices/system/cpu/cpu0/cpufreq ?
 > 
 > No, not with just acpi-cpufreq loaded. With the help of Zwane, I've
 > discovered that if I unload acpi-cpufreq, I *can* load p4-clockmod, and then
 > the directory you mention appears, and I can configure governors, and life
 > is good. This all on 2.6.18-rc3.

Right, cpufreq drivers aren't 'stackable'.

 > Do I understand correctly that acpi-cpufreq is supposed to offer comparable
 > features?

If the BIOS supports the relevant ACPI tables.

 > Perhaps acpi-cpufreq *has* loaded, but did not find the proper hooks, but
 > has now registered itself, thus blocking p4-clockmod? When everything is
 > in-kernel, acpi-cpufreq might register itself first, which would lead to the
 > same thing.

Normally, if the necessary BIOS bits aren't there, then acpi-cpufreq will
fail to register.  For some reason it sounds like it believes that everything
went ok.  I wonder if something changed in acpi recently that caused this
change in behaviour ? Len ?

		Dave

-- 
http://www.codemonkey.org.uk

Re: 2.6.17 -> 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[bert hubert]

On Sun, Jul 30, 2006 at 03:01:33PM -0400, Dave Jones wrote:

> Normally, if the necessary BIOS bits aren't there, then acpi-cpufreq will
> fail to register.  For some reason it sounds like it believes that everything
> went ok.  I wonder if something changed in acpi recently that caused this
> change in behaviour ? Len ?

As far as I can see, acpi_cpufreq does not pass on any errors it sees during
init:

static int __init acpi_cpufreq_init (void)
{
        int                     result = 0;

        dprintk("acpi_cpufreq_init\n");

        result = acpi_cpufreq_early_init_acpi();
...

And from acpi_cpufreq_early_init_acpi():

static int acpi_cpufreq_early_init_acpi(void)
{
        struct acpi_processor_performance       *data;
        unsigned int                            i, j;

        dprintk("acpi_cpufreq_early_init\n");

	( some memory allocations, does not look at acpi or bios )
	
        /* Do initialization in ACPI core */
        acpi_processor_preregister_performance(acpi_perf_data);
        return 0;
}

Note how any error from acpi_processor_preregister_performance is ignored.

Ghetto patch which "fixes" the problem for me:

--- ./arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c~orig  2006-07-30 21:14:43.000000000 +0200
+++ ./arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c       2006-07-30 21:11:34.000000000 +0200
@@ -384,8 +384,7 @@
        }

        /* Do initialization in ACPI core */
-       acpi_processor_preregister_performance(acpi_perf_data);
-       return 0;
+       return acpi_processor_preregister_performance(acpi_perf_data);
 }


But tonight I have no speedstep laptop available to check if this does not
kill acpi_cpufreq when it can work.

Thanks for the hint, dave!

-- 
http://www.PowerDNS.com      Open source, database driven DNS Software 
http://netherlabs.nl              Open and Closed source services

Re: 2.6.17 -> 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[bert hubert]

> went ok.  I wonder if something changed in acpi recently that caused this
> change in behaviour ? Len ?

Dave,

I'm no expert but I think it was you that made this change in
http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blobdiff;h=567b39bea07e4fbbe091b265b010905e3d30ff5a;hp=1a7bdcef19261deff5a7ea8ee13d5a8ddb434a19;hb=911cb74bb9e77e40749abc2fca6fe74d87d940f3;f=arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c

+ /* Do initialization in ACPI core */
+ acpi_processor_preregister_performance(acpi_perf_data);
+ return 0;
+}

:-)

-- 
http://www.PowerDNS.com      Open source, database driven DNS Software 
http://netherlabs.nl              Open and Closed source services

Re: 2.6.17 -> 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[Dave Jones]

On Mon, Jul 31, 2006 at 09:08:01AM +0200, bert hubert wrote:
 > > went ok.  I wonder if something changed in acpi recently that caused this
 > > change in behaviour ? Len ?
 > 
 > Dave,
 > 
 > I'm no expert but I think it was you that made this change in
 > http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blobdiff;h=567b39bea07e4fbbe091b265b010905e3d30ff5a;hp=1a7bdcef19261deff5a7ea8ee13d5a8ddb434a19;hb=911cb74bb9e77e40749abc2fca6fe74d87d940f3;f=arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c
 > 
 > + /* Do initialization in ACPI core */
 > + acpi_processor_preregister_performance(acpi_perf_data);
 > + return 0;
 > +}
 > 
 > :-)

I'm puzzled. As that commit message doesn't match the diff.
If you click "commitdiff", you'll see the actual commit for that msg,
which is a one-liner.

Your change in your previous mail makes sense to me though,
so I'll commit it to cpufreq.git later today.

		Dave


-- 
http://www.codemonkey.org.uk

Re: 2.6.17 -> 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[bert hubert]

On Mon, Jul 31, 2006 at 12:20:46PM -0400, Dave Jones wrote:

> Your change in your previous mail makes sense to me though,
> so I'll commit it to cpufreq.git later today.

Do you think this will make 2.6.18? Otherwise any kernel with acpi_list
compiled in will have no frequency scaling, unless it supports scaling over
ACPI.

Thanks!

-- 
http://www.PowerDNS.com      Open source, database driven DNS Software 
http://netherlabs.nl              Open and Closed source services

Re: 2.6.17 -> 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[Dave Jones]

On Mon, Jul 31, 2006 at 08:57:13PM +0200, bert hubert wrote:
 > On Mon, Jul 31, 2006 at 12:20:46PM -0400, Dave Jones wrote:
 > 
 > > Your change in your previous mail makes sense to me though,
 > > so I'll commit it to cpufreq.git later today.
 > 
 > Do you think this will make 2.6.18? Otherwise any kernel with acpi_list
 > compiled in will have no frequency scaling, unless it supports scaling over
 > ACPI.

Yes, I'll queue it for .18

		Dave

-- 
http://www.codemonkey.org.uk

Re: 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[Zwane Mwaikambo]

On Sun, 30 Jul 2006, Tomasz Torcz wrote:

> On Sun, Jul 30, 2006 at 02:08:44PM +0200, bert hubert wrote:
> > Hi everybody,
> > 
> > Since 2.6.18-rc1, up to and including -rc3, cpufreq has died on me. It
> > worked fine in 2.6.16.9.
> > 
> > # modprobe p4_clockmod
> > FATAL: Error inserting p4_clockmod
> > (/lib/modules/2.6.18-rc3/kernel/arch/i386/kernel/cpu/cpufreq/p4-clockmod.ko):
> > Device or resource busy
> > 
> 
>   I have similar problem with cpufreq-nforce2 -- http://lkml.org/lkml/2006/7/7/234
>   I haven't do a git-bisect yet.

Could you fellows try it without;

CONFIG_X86_SPEEDSTEP_CENTRINO
CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI
CONFIG_X86_SPEEDSTEP_CENTRINO_TABLE
CONFIG_X86_SPEEDSTEP_ICH
CONFIG_X86_SPEEDSTEP_SMI
CONFIG_X86_ACPI_CPUFREQ

It may likely be a driver registration thing.

Thanks,
	Zwane

Re: 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[Tomasz Torcz]

[-- Attachment #1: Type: text/plain, Size: 1424 bytes --]

On Sun, Jul 30, 2006 at 10:45:13AM -0700, Zwane Mwaikambo wrote:
> On Sun, 30 Jul 2006, Tomasz Torcz wrote:
> 
> > On Sun, Jul 30, 2006 at 02:08:44PM +0200, bert hubert wrote:
> > > Hi everybody,
> > > 
> > > Since 2.6.18-rc1, up to and including -rc3, cpufreq has died on me. It
> > > worked fine in 2.6.16.9.
> > > 
> > > # modprobe p4_clockmod
> > > FATAL: Error inserting p4_clockmod
> > > (/lib/modules/2.6.18-rc3/kernel/arch/i386/kernel/cpu/cpufreq/p4-clockmod.ko):
> > > Device or resource busy
> > > 
> > 
> >   I have similar problem with cpufreq-nforce2 -- http://lkml.org/lkml/2006/7/7/234
> >   I haven't do a git-bisect yet.
> 
> Could you fellows try it without;
> 
> CONFIG_X86_SPEEDSTEP_CENTRINO
> CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI
> CONFIG_X86_SPEEDSTEP_CENTRINO_TABLE
> CONFIG_X86_SPEEDSTEP_ICH
> CONFIG_X86_SPEEDSTEP_SMI

  I had those =n

> CONFIG_X86_ACPI_CPUFREQ

  I had this one =y. After setting =n, cpufreq-nforce2 (=m) works again.

powernowd: PowerNow Daemon v0.96, (c) 2003-2005 John Clemens
powernowd: Found 1 cpu:  -- 1 thread (or core) per physical cpu
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies: No
such file or directory
powernowd:   cpu0: 1228Mhz - 1753Mhz (7 steps)

-- 
Tomasz Torcz               "Never underestimate the bandwidth of a station
zdzichu@irc.-nie.spam-.pl    wagon filled with backup tapes." -- Jim Gray


[-- Attachment #2: Type: application/pgp-signature, Size: 229 bytes --]

Re: 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[Zwane Mwaikambo]

On Mon, 31 Jul 2006, Tomasz Torcz wrote:

> On Sun, Jul 30, 2006 at 10:45:13AM -0700, Zwane Mwaikambo wrote:
> 
> > CONFIG_X86_ACPI_CPUFREQ
> 
>   I had this one =y. After setting =n, cpufreq-nforce2 (=m) works again.
> 
> powernowd: PowerNow Daemon v0.96, (c) 2003-2005 John Clemens
> powernowd: Found 1 cpu:  -- 1 thread (or core) per physical cpu
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies: No
> such file or directory
> powernowd:   cpu0: 1228Mhz - 1753Mhz (7 steps)

Hi Tomasz,

	Could you also please test Bert's patch which propogates error 
return values with your previous configuration?

Thanks,
	Zwane

Re: 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[Tomasz Torcz]

[-- Attachment #1: Type: text/plain, Size: 1033 bytes --]

On Mon, Jul 31, 2006 at 07:04:07AM -0700, Zwane Mwaikambo wrote:
> On Mon, 31 Jul 2006, Tomasz Torcz wrote:
> 
> > On Sun, Jul 30, 2006 at 10:45:13AM -0700, Zwane Mwaikambo wrote:
> > 
> > > CONFIG_X86_ACPI_CPUFREQ
> > 
> >   I had this one =y. After setting =n, cpufreq-nforce2 (=m) works again.
> > 
> > powernowd: PowerNow Daemon v0.96, (c) 2003-2005 John Clemens
> > powernowd: Found 1 cpu:  -- 1 thread (or core) per physical cpu
> > /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies: No
> > such file or directory
> > powernowd:   cpu0: 1228Mhz - 1753Mhz (7 steps)
> 
> Hi Tomasz,
> 
> 	Could you also please test Bert's patch which propogates error 
> return values with your previous configuration?

  Bert's patch works. With CONFIG_X86_ACPI_CPUFREQ=y and
cpufre-nforce2=m I have working cpufreq (like in 2.6.17 and before).

-- 
Tomasz Torcz               "Never underestimate the bandwidth of a station
zdzichu@irc.-nie.spam-.pl    wagon filled with backup tapes." -- Jim Gray


[-- Attachment #2: Type: application/pgp-signature, Size: 229 bytes --]

Re: 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[Arjan van de Ven]

On Sun, 2006-07-30 at 18:07 +0200, Tomasz Torcz wrote:
> On Sun, Jul 30, 2006 at 02:08:44PM +0200, bert hubert wrote:
> > Hi everybody,
> > 
> > Since 2.6.18-rc1, up to and including -rc3, cpufreq has died on me. It
> > worked fine in 2.6.16.9.
> > 
> > # modprobe p4_clockmod
> > FATAL: Error inserting p4_clockmod
> > (/lib/modules/2.6.18-rc3/kernel/arch/i386/kernel/cpu/cpufreq/p4-clockmod.ko):
> > Device or resource busy
> > 

as a side note ... you realize that clockmod doesn't actually save you
any power right? ;)

Re: 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[bert hubert]

On Sun, Jul 30, 2006 at 09:46:51PM +0200, Arjan van de Ven wrote:

> as a side note ... you realize that clockmod doesn't actually save you
> any power right? ;)

Indeed, and I've measured that too. But it saves an awful amount of noise!

-- 
http://www.PowerDNS.com      Open source, database driven DNS Software 
http://netherlabs.nl              Open and Closed source services

Re: 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[David Rees]

On 7/30/06, bert hubert <bert.hubert@netherlabs.nl> wrote:
> On Sun, Jul 30, 2006 at 09:46:51PM +0200, Arjan van de Ven wrote:
>
> > as a side note ... you realize that clockmod doesn't actually save you
> > any power right? ;)
>
> Indeed, and I've measured that too. But it saves an awful amount of noise!

If it doesn't save you power, how does it reduce noise? I guess it
keeps you from overheating your processor which causes the fan to spin
up?

-Dave

Re: 2.6.18 regression: cpufreq broken since 2.6.18-rc1 on pentium4

[bert hubert]

On Mon, Jul 31, 2006 at 12:50:07AM -0700, David Rees wrote:
> >Indeed, and I've measured that too. But it saves an awful amount of noise!
> 
> If it doesn't save you power, how does it reduce noise? I guess it
> keeps you from overheating your processor which causes the fan to spin
> up?

I have no idea. Perhaps heat production moves somewhere else. But you are
free to come listen to the difference p4-clockmod makes for me. 

Thanks.

-- 
http://www.PowerDNS.com      Open source, database driven DNS Software 
http://netherlabs.nl              Open and Closed source services