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From: Alexander Motin <mav@FreeBSD.org>
Date: Thu, 26 Nov 2009 15:11:19 +0000 (UTC)
To: cvs-src-old@freebsd.org
X-FreeBSD-CVS-Branch: RELENG_8
Subject: cvs commit: src/sys/i386/cpufreq est.c
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mav         2009-11-26 15:11:19 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_8)
    sys/i386/cpufreq     est.c 
  Log:
  SVN rev 199834 on 2009-11-26 15:11:19Z by mav
  
  MFC r199268, r199269, r199273:
  Core2Duo/Core2Quad CPUs are unable to control frequency of single CPU
  core, only pair of them. As result, both cores are running on highest
  one of requested frequencies, and that is reported by status register.
  Such behavior confuses frequency validation logic, as it runs on only
  one core, as SMP is not yet launched, making EIST completely unusable.
  
  Disable frequency validation by default, for systems with more then one
  CPU, until we can implement it properly. It looks like making more harm
  now then benefits. Add 'hw.est.strict' loader tunable to control it.
  
  PR:             amd64/140506
  
  Revision  Changes    Path
  1.24.2.2  +16 -7     src/sys/i386/cpufreq/est.c