New: conservative governor doesn't increase frequency, just decrease. powernow-k7
http://bugzilla.kernel.org/show_bug.cgi?id=10055
Summary: conservative governor doesn't increase frequency, just
decrease. powernow-k7
Product: Power Management
Version: 2.5
KernelVersion: 2.6.24.2
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: cpufreq
AssignedTo: [email protected]
ReportedBy: [email protected]
Latest working kernel version:2.6.23.16
Earliest failing kernel version:2.6.24
Distribution:Gentoo
Hardware Environment:mitac 8375 Athlon XP-M 2800+
Problem Description: kernel 2.6.24.2, conservative governor compiled in (doesn't matter whether module or not). If I set conservative as current governor (either via cpufreq-utils or set it as default governor in kernel) the CPU frequency decreases slowly at low CPU load as it ought to be. But if I put the CPU on high load then,the frequency remains unchanged. Conservative is working on 2.6.23.*, ondemand works even on 2.6.24 CPU frequency module is powernow-k7 compiled in as module.
Steps to reproduce:
1.compile kernel with conservative governor
2.set it as current governor
3.put CPU on high load
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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7
http://bugzilla.kernel.org/show_bug.cgi?id=10055
[email protected] changed:
What |Removed |Added
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CC| |[email protected] Regression|0 |1
------- Comment #1 from [email protected] 2008-02-20 15:52 ------- marked as a regression..
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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=10055
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------- Comment #2 from [email protected] 2008-02-20 16:44 ------- Most obvious candidate for a problematic diff would be this patch I guess..
commit 1c2562459faedc35927546cfa5273ec6c2884cce
Author: Thomas Renninger <[email protected]> Date: Tue Oct 2 13:28:12 2007 -0700
[CPUFREQ] allow ondemand and conservative cpufreq governors to be used as
default
Depending on the transition latency of the HW for cpufreq switches, the ondemand or conservative governor cannot be used with certain cpufreq drivers. Still the ondemand should be the default governor on a wide range of systems. This patch allows this and lets the governor fallback to the performance governor at cpufreq driver load time, if the driver does not support fast enough frequency switching.
Main benefit is that on e.g. installation or other systems without userspace support a working dynamic cpufreq support can be achieved on most systems by simply loading the cpufreq driver. This is especially essential for recent x86(_64) laptop hardware which may rely on working dynamic cpufreq OS support.
Looking through it though, I'm not entirely clear how it could be at fault.
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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7
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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7
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------- Comment #3 from [email protected] 2008-02-24 15:01 ------- downstream bug report
https://bugs.gentoo.org/show_bug.cgi?id=210747
(identical, link for reference only)
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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7
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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7
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------- Comment #4 from [email protected] 2008-06-01 16:57 ------- Eric, is this still a problem with current kernel?
If so, you can try enabling CPU_FREQ_DEBUG in the config and either boot with cpufreq.debug=X or load cpufreq with debug=X parameter, where X is 1(core) 2(driver) or 4(governor) debug.
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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7
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------- Comment #5 from [email protected] 2008-06-01 17:19 ------- Could you try the patch on:
http://bugzilla.kernel.org/show_bug.cgi?id=8081
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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7
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------- Comment #6 from [email protected] 2008-07-29 01:37 ------- Still a problem with 2.6.25
Alex: This is NOT the same bug as with conservative climbing extremely slowly due to a high scaling_min value. In this case, it will not climb AT ALL -- even hours pegged at 100%, and it will stay at the same frequency. The bug you reference also appeared much earlier -- this one appeared with 2.6.24, and 2.6.23 is fine.
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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7
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------- Comment #7 from [email protected] 2008-07-29 02:04 ------- Created an attachment (id=17022)
--> (http://bugzilla.kernel.org/attachment.cgi?id=17022&action=view)
kern log for cpufreq scaling not working
Kernel log for cpufreq conservative scaling not working, cpufreq.debug=7. For the last few minutes of this log, the CPU was pegged at 95-100%, yet the frequency stood still at the lowest possible value.
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[Bug 10055] conservative governor doesn't increase frequency, just decrease. powernow-k7
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