New: p4-clockmod reports false frequency
http://bugzilla.kernel.org/show_bug.cgi?id=10968
Summary: p4-clockmod reports false frequency
Product: Power Management
Version: 2.5
KernelVersion: 2.6.25.7
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: cpufreq
AssignedTo: [email protected]
ReportedBy: [email protected]
# uname -a Linux hyperix 2.6.25.7 #2 Sat Jun 21 14:12:02 CEST 2008 i686 Intel(R) Pentium(R) 4 CPU 1.80GHz GenuineIntel GNU/Linux # cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 1 model name : Intel(R) Pentium(R) 4 CPU 1.80GHz stepping : 2 cpu MHz : 3650.000 cache size : 256 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 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 pebs bts bogomips : 3603.33 clflush size : 64
# cpufreq-info cpufrequtils 0.4: cpufreq-info (C) Dominik Brodowski 2004 Report errors and bugs to [email protected], please. analyzing CPU 0: driver: p4-clockmod CPUs which need to switch frequency at the same time: 0 hardware limits: 3.65 GHz - 14.60 GHz available frequency steps: 3.65 GHz, 5.48 GHz, 7.30 GHz, 9.13 GHz, 10.95 GHz, 12.78 GHz, 14.60 GHz available cpufreq governors: ondemand, userspace current policy: frequency should be within 3.65 GHz and 14.60 GHz. The governor "ondemand" may decide which speed to use within this range. current CPU frequency is 5.48 GHz (asserted by call to hardware).
Latest working kernel version: 2.6.23 (last version that I tried)
Any suggestions?
To me it seems that the bit shift width is incorrect. I had a similar problems years ago and fixed by adding a different bit shift width for Pentium 4 Model 0 and 1.
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[Bug 10968] p4-clockmod reports false frequency
http://bugzilla.kernel.org/show_bug.cgi?id=10968
[email protected] changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected] Regression|0 |1
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[Bug 10968] p4-clockmod reports false frequency
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=10968
------- Comment #1 from [email protected] 2008-07-05 04:40 ------- The bug was introduced in commit ed9cbcd40004904dbe61ccc16d6106a7de38c998. As proposed in bug #7186 the fix seems to be wrong, but worked for most people.
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[Bug 10968] p4-clockmod reports false frequency
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=10968
------- Comment #2 from [email protected] 2008-07-07 06:02 ------- According to the Intel specification there is no such multiplier field in the msr, so the frequency has to be measured by the tsc on Pentium 4 Model 0 and 1. Does anyone disagree?
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[Bug 10968] p4-clockmod reports false frequency
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=10968
------- Comment #3 from [email protected] 2008-07-18 15:08 ------- Created an attachment (id=16881)
--> (http://bugzilla.kernel.org/attachment.cgi?id=16881&action=view)
calculates frequency based on tsc value
The attached patch should fix the issue forever more, because it conforms now entirely to the specification.
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[Bug 10968] p4-clockmod reports false frequency
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=10968
------- Comment #4 from [email protected] 2008-07-23 11:46 ------- patch looks good. Matthias-Christian, can you submit it with proper signed-off-by-line to davej, and davej can you pick it up with my Acked-by-line, please? Thanks!
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[Bug 10968] p4-clockmod reports false frequency
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=10968
[email protected] changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |CODE_FIX------- Comment #5 from [email protected] 2008-07-23 13:51 ------- Patch submitted.
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