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From: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
To: "Alexander Bokovoy" <ab@altlinux.org>, "M?ns Rullg?rd" <mru@kth.se>
Cc: <cpufreq@www.linux.org.uk>, <linux-kernel@vger.kernel.org>
Subject: RE: [PATCHSET] 0/3 Dynamic cpufreq governor and updates to ACPI P-state driver
Date: Tue, 21 Oct 2003 18:48:18 -0700	[thread overview]
Message-ID: <88056F38E9E48644A0F562A38C64FB6007792A@scsmsx403.sc.intel.com> (raw)



> -----Original Message-----
> From: linux-kernel-owner@vger.kernel.org 
> [mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of 
> Alexander Bokovoy
> Sent: Tuesday, October 21, 2003 2:11 PM
> To: M?ns Rullg?rd
> Cc: cpufreq@www.linux.org.uk; linux-kernel@vger.kernel.org
> Subject: Re: [PATCHSET] 0/3 Dynamic cpufreq governor and 
> updates to ACPI P-state driver
> 
> 
> On Tue, Oct 21, 2003 at 10:39:16PM +0200, M?ns Rullg?rd wrote:
> > Alexander Bokovoy <ab@altlinux.org> writes:
> > 
> > >> > Most of the latest CPUs (laptop CPUs in particular) 
> have feature 
> > >> > which enable very low latency P-state transitions 
> > >> > (like Enhanced Speedstep Technology-EST). Using this feature, 
> > >> > we can have a lightweight in kernel cpufreq governor, 
> > >> > to vary CPU frequency depending on the CPU usage. The 
> > >> > advantage being low power consumption and also cooler laptops.
> > >> 
> > >> So, I took this thing for a spin, but it didn't work at 
> all.  I loaded
> > >> the module, and did "echo demandbased > 
> /sys/.../scaling_governor".
> > >> This echo never returned, and the keyboard locked up.  
> After a little
> > >> while, the fan started running at full speed.  I managed 
> to cut and
> > >> paste into an xterm and start top, which showed nothing 
> unusual.  I
> > >> could shut down and reboot normally.
> > > I applied these patches to stock 2.6.0-test8 and selected 
> 'demandbased' as
> > > default governor. In result, everything worked from the 
> very beginning, my
> > > Centrino-based system went to 600MHz and was upping when 
> load was going
> > > higher during compilation or disk access but went down 
> when load was
> > > lowering. So it works well for me.
> > 
> > What's your /proc/cpuinfo?  Mine says
> > 
> > processor	: 0
> > vendor_id	: GenuineIntel
> > cpu family	: 15
> > model		: 2
> > model name	: Mobile Intel(R) Pentium(R) 4 - M CPU 1.80GHz


AFAIK, Pentium 4 M does not support EST (Frequency transitions with low
latency). 
But that doesn't explain why it is hanging though. Which speedstep
driver are you using?
P4-clockmod? Or acpi? Can you send the complete dmesg.


Thanks,
-Venkatesh

WARNING: multiple messages have this Message-ID (diff)
From: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
To: Alexander Bokovoy <ab@altlinux.org>, M?ns Rullg?rd <mru@kth.se>
Cc: cpufreq@www.linux.org.uk, linux-kernel@vger.kernel.org
Subject: RE: [PATCHSET] 0/3 Dynamic cpufreq governor and updates to ACPI P-state driver
Date: Tue, 21 Oct 2003 18:48:18 -0700	[thread overview]
Message-ID: <88056F38E9E48644A0F562A38C64FB6007792A@scsmsx403.sc.intel.com> (raw)



> -----Original Message-----
> From: linux-kernel-owner@vger.kernel.org 
> [mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of 
> Alexander Bokovoy
> Sent: Tuesday, October 21, 2003 2:11 PM
> To: M?ns Rullg?rd
> Cc: cpufreq@www.linux.org.uk; linux-kernel@vger.kernel.org
> Subject: Re: [PATCHSET] 0/3 Dynamic cpufreq governor and 
> updates to ACPI P-state driver
> 
> 
> On Tue, Oct 21, 2003 at 10:39:16PM +0200, M?ns Rullg?rd wrote:
> > Alexander Bokovoy <ab@altlinux.org> writes:
> > 
> > >> > Most of the latest CPUs (laptop CPUs in particular) 
> have feature 
> > >> > which enable very low latency P-state transitions 
> > >> > (like Enhanced Speedstep Technology-EST). Using this feature, 
> > >> > we can have a lightweight in kernel cpufreq governor, 
> > >> > to vary CPU frequency depending on the CPU usage. The 
> > >> > advantage being low power consumption and also cooler laptops.
> > >> 
> > >> So, I took this thing for a spin, but it didn't work at 
> all.  I loaded
> > >> the module, and did "echo demandbased > 
> /sys/.../scaling_governor".
> > >> This echo never returned, and the keyboard locked up.  
> After a little
> > >> while, the fan started running at full speed.  I managed 
> to cut and
> > >> paste into an xterm and start top, which showed nothing 
> unusual.  I
> > >> could shut down and reboot normally.
> > > I applied these patches to stock 2.6.0-test8 and selected 
> 'demandbased' as
> > > default governor. In result, everything worked from the 
> very beginning, my
> > > Centrino-based system went to 600MHz and was upping when 
> load was going
> > > higher during compilation or disk access but went down 
> when load was
> > > lowering. So it works well for me.
> > 
> > What's your /proc/cpuinfo?  Mine says
> > 
> > processor	: 0
> > vendor_id	: GenuineIntel
> > cpu family	: 15
> > model		: 2
> > model name	: Mobile Intel(R) Pentium(R) 4 - M CPU 1.80GHz


AFAIK, Pentium 4 M does not support EST (Frequency transitions with low
latency). 
But that doesn't explain why it is hanging though. Which speedstep
driver are you using?
P4-clockmod? Or acpi? Can you send the complete dmesg.


Thanks,
-Venkatesh

             reply	other threads:[~2003-10-22  1:48 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-10-22  1:48 Pallipadi, Venkatesh [this message]
2003-10-22  1:48 ` [PATCHSET] 0/3 Dynamic cpufreq governor and updates to ACPI P-state driver Pallipadi, Venkatesh
  -- strict thread matches above, loose matches on Subject: below --
2003-11-05 21:12 Mukesh Rajan
2003-11-04  3:14 Brown, Len
2003-11-04  3:21 ` Jan Rychter
2003-11-04  7:16   ` Dominik Brodowski
2003-10-22 18:21 Pallipadi, Venkatesh
2003-10-23  8:19 ` Arjan van de Ven
2003-10-23  8:24   ` Alexander Bokovoy
2003-10-23  8:29     ` Arjan van de Ven
2003-10-23 18:03       ` Ducrot Bruno
2003-10-23 18:16   ` Todd Poynor
2003-10-23 18:26     ` Todd Poynor
2003-11-02 20:28 ` Jan Rychter
2003-10-22  1:42 Pallipadi, Venkatesh
2003-10-22  1:42 ` Pallipadi, Venkatesh
2003-10-21  2:56 Pallipadi, Venkatesh
2003-10-21  2:56 ` Pallipadi, Venkatesh
2003-10-21  8:25 ` Måns Rullgård
2003-10-21  8:25   ` Måns Rullgård
2003-10-21 20:47   ` Dominik Brodowski
2003-10-21 10:57 ` Måns Rullgård
2003-10-21 11:09   ` Måns Rullgård
2003-10-21 20:30   ` Alexander Bokovoy
2003-10-21 20:39     ` Måns Rullgård
2003-10-21 21:11       ` Alexander Bokovoy
2003-10-21 21:37         ` Måns Rullgård
2003-10-21 21:53           ` Alexander Bokovoy
2003-10-21 22:27             ` Måns Rullgård

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