[Bug 246525] New: CPU loses cpufreq link after offline/online transition
https://bugzilla.novell.com/show_bug.cgi?id=246525 Summary: CPU loses cpufreq link after offline/online transition Product: openSUSE 10.2 Version: Final Platform: i686 OS/Version: Other Status: NEW Severity: Normal Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: bernhard.bender@web.de QAContact: qa@suse.de CC: trenn@novell.com, seife@novell.com, dkukawka@novell.com, rjwysocki@sisk.pl This bug entry is created to separately collect information previously handled in bug 239101. Taking a secondary CPU offline and online again makes this CPU lose its /sys/devices/system/cpu/cpu1/cpufreq link. This will cause kpowersave to show the CPU as deactivated. The same will happend when the machine goes into suspend2disk and resumes again. Hardware: hp compaq nx6325 Kernel: 2.6.20 KOTD ftp://ftp.suse.com/pub/projects/kernel/kotd/i386/HEAD/kernel-default-2.6.20-20070215134239.i586.rpm -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=246525 ------- Comment #1 from bernhard.bender@web.de 2007-02-16 15:39 MST ------- Created an attachment (id=119765) --> (https://bugzilla.novell.com/attachment.cgi?id=119765&action=view) losing cpufreq link on CPU The file shows the loss of the cpufreq link for CPU1 after the offline/online transition -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=246525 ------- Comment #2 from rjwysocki@sisk.pl 2007-02-16 16:58 MST ------- I use 2.6.20 on the same machine type (nx6325) with the same distribution and I do _not_ observe the symptoms described. Thus there must be a difference between our configurations that leads to this problem. Can you please attach your kernel config? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=246525 ------- Comment #3 from bernhard.bender@web.de 2007-02-16 18:04 MST ------- Created an attachment (id=119787) --> (https://bugzilla.novell.com/attachment.cgi?id=119787&action=view) kernel config for 2.6.20-20070215134239 This is the config file installed with the 2.6.20-20070215134239 kernel for KOTD -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=246525 trenn@novell.com changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED ------- Comment #4 from trenn@novell.com 2007-02-17 01:48 MST ------- This is really weird, I also cannot reproduce this with the same machine. Maybe: a) you modified BIOS configs (rather unlikely that it's related) b) we have different userspace application versions (maybe userspace rips out some more modules, aditionally writes some /sys, /proc entries, have you added some workaround in userspace for s2disk?) I suggest to wait for the next 10.3 Alpha2 version. If there still is the problem, we must be able to reproduce this and can work on the exactly same code base (hmm or do we have different BIOS versions, mine is F.02). -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=246525 ------- Comment #5 from rjwysocki@sisk.pl 2007-02-17 02:57 MST ------- Referring to Comment #3: Ah, I see. Your kernel is 32-bit, while I use a 64-bit one. I bet the Thomas' kernel is also 64-bit and that would explain the difference. If that is the case, CPU hotplug vs cpufreq may be broken for all AMD64 machines with 32-bit kernels, but that would need to be confirmed. Thomas, is your kernel 64-bit? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=246525 ------- Comment #6 from trenn@novell.com 2007-02-17 03:07 MST ------- Good catch! If onlining the cpu works in general, but only the cpufreq directory is missing I expect the culprit is in drivers/cpufreq/cpufreq.c or in the powernow-k8 driver itself (a guess). However, I won't have time to look into this the next days. If I don't hear anything I try to start digging in the middle/end of next week... -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=246525 ------- Comment #7 from rjwysocki@sisk.pl 2007-02-17 03:23 MST ------- Well, there is a known issue with the CPU hotplug locking that affects cpufreq, but I haven't seen any user-visible symptoms of it yet. It may or may not be related. Anyway, I think we can safely create a kernel bugzilla entry for this issue. Bernhard, could you please do so? I think you can say that the 2.6.20 (vanilla) kernel is affected. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=246525 gregkh@novell.com changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution| |INVALID ------- Comment #8 from gregkh@novell.com 2007-02-17 18:08 MST ------- ok, closing this for now, as this really isn't a problem, right? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=246525 ------- Comment #9 from bernhard.bender@web.de 2007-02-18 06:55 MST ------- Posted to kernel.org http://bugzilla.kernel.org/show_bug.cgi?id=8033 -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=246525 ------- Comment #10 from rjwysocki@sisk.pl 2007-02-18 07:48 MST ------- OK, thanks. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
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