Bug 202009
Summary: | powernow-k8: fid trans failed, fid 0xc, curr 0xe | ||
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Product: | [Fedora] Fedora | Reporter: | Alan Cox <alan> |
Component: | kernel-xen | Assignee: | Xen Maintainance List <xen-maint> |
Status: | CLOSED CURRENTRELEASE | QA Contact: | Brian Brock <bbrock> |
Severity: | high | Docs Contact: | |
Priority: | high | ||
Version: | rawhide | CC: | bstein, carenas, clalance, davej, jr-redhatbugs2, wtogami |
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | All | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | kernel-xen-2.6.18-1.2767.fc6 | Doc Type: | Bug Fix |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2006-11-07 14:36:30 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: | |||
Bug Depends On: | 191566 | ||
Bug Blocks: |
Description
Alan Cox
2006-08-10 11:23:15 UTC
Seeing the same with FC6test2 and the Xen kernel - spews powernow errors every second or so, with high urgency level that spew all over the console. Not sure if this is a Xen related bug (no powernow and it shouldnt be enabled) or a kernel one. This seems to be Xen specific. When the Xen dom0 boots up, the powernow-k8_init function is called, which goes around to each CPU to query whether it supports frequency and voltage transition. All of this is read-only, so all of the calls to access the various feature flags of the CPU succeed, and the code thinks that the processor is capable of the transitions. However, later on, when it actually tries to do the transition, the Hypervisor prevents the write to the MSR register, which fails the frequency change, which causes the messages to be continually output. This can be further seen by looking at the messages coming out of both the Hypervisor and the dom0 kernel: (XEN) (file=traps.c, line=1385) Domain attempted WRMSR 00000000c0010041 from 00.powernow-k8: fid trans failed, fid 0x10, curr 0x12 powernow-k8: transition frequency failed Patch here (haven't tested myself): http://groups.google.com/group/xen-devel-archive/browse_thread/thread/dd1794f10ecf69aa/23a55071d651ee28 Still present in the -200 kernel from rawhide yesterday Still present in FC6Pre - spewed all over the console, message level regardless and makes Xen unusuable on the afflicted systems. I was under the impression we were disabling CPU_FREQ for Xen for now until some sanity gets beaten into it on the Xen side. It was disabled on Oct. 11. |