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From: Dominik Brodowski <linux@dominikbrodowski.de>
To: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: davej@redhat.com, cpufreq@www.linux.org.uk
Subject: Re: [PATCH] speedstep-centrino: Avoid returning zero freq on transient MSR values
Date: Fri, 10 Dec 2004 09:14:25 +0100	[thread overview]
Message-ID: <20041210081425.GA8989@dominikbrodowski.de> (raw)
In-Reply-To: <20041209172436.A3337@unix-os.sc.intel.com>

On Thu, Dec 09, 2004 at 05:24:36PM -0800, Venkatesh Pallipadi wrote:
> 
> On some CPUs, we can see transient MSR values (which are not present in _PSS) in
> IA32_PERF_STATUS MSR, while CPU is doing some automatic P-state transition 
> (like TM2). 
> Current code will return frequency as 0 in such cases. Fix it by retrying the 
> get after a delay and use lowest possible frequency as the current frequency 
> in worst case.
> 
> Thanks to Matt Domsch for identifying and root-causing this failure.
> 
> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Dominik Brodowski <linux@brodo.de>

Thanks,
	Dominik

  reply	other threads:[~2004-12-10  8:14 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-12-10  1:24 [PATCH] speedstep-centrino: Avoid returning zero freq on transient MSR values Venkatesh Pallipadi
2004-12-10  8:14 ` Dominik Brodowski [this message]
2004-12-10 10:11 ` Jeremy Fitzhardinge
2004-12-10 14:47   ` Dominik Brodowski
  -- strict thread matches above, loose matches on Subject: below --
2004-12-10 18:37 Pallipadi, Venkatesh
2004-12-10 21:16 ` Jeremy Fitzhardinge

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