Most recent kernel where this bug did not occur: 2.6.15.6 Distribution: Debian Sarge Hardware Environment: Dell Power Edge 1600SC with 2800 GHz P4 Xeon HT Software Environment: Problem Description: Using the new kernel, cpufreq-info only shows: hardware limits: 2.10 GHz - 2.80 GHz available frequency steps: 2.10 GHz, 2.45 GHz, 2.80 GHz With the 2.6.15 version it shows much more: hardware limits: 350 MHz - 2.80 GHz available frequency steps: 350 MHz, 700 MHz, 1.05 GHz, 1.40 GHz, 1.75 GHz, 2.10 GHz, 2.45 GHz, 2.80 GHz Steps to reproduce: Boot with 2.6.16.20 Kernel and watch cpufreq-info output. kind regards Torsten
A hardware bug makes it risky to use throttling states with frequencies lower than 2.0 GHz on this processor.
Would have been nice to read about such changes in Changelog of Kernel, maybe i missed it but afaik i read nothing about. What are you meaning with risky? Any documentation about this Bug out there, can you link something or explain maybe. thx. kind regards Torsten
http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=c70ca00f77eb1bb69c5a2d029b3a911bc88eac1b is the change, and "N60" refers to the errata noted in Intel's documentation spec sheet at http://developer.intel.com/design/pentium4/specupdt/249199.htm