Bug 222532
Summary: | no centrino speedstep with xen | ||
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Product: | [Fedora] Fedora | Reporter: | Jörg Prante <joergprante> |
Component: | xen | Assignee: | Xen Maintainance List <xen-maint> |
Status: | CLOSED DEFERRED | QA Contact: | Brian Brock <bbrock> |
Severity: | medium | Docs Contact: | |
Priority: | medium | ||
Version: | 6 | CC: | bstein, katzj |
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | i686 | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | Bug Fix | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2007-01-15 16:28:57 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: |
Description
Jörg Prante
2007-01-13 13:47:28 UTC
The reason that frequency scaling is disabled is not because speedstep doesn't work under Xen. It *does* work, if enabled --- but it completely fails to take account of activity in domains other than the host dom0. So if you have a guest domU busy on the machine and dom0 is idle, frequency scaling will slow the host down to its slowest setting. In the future we hope for this to be fixed upstream, but we have no plans to address it in FC-6 at this time. Sorry, I forgot a diagnostic message. The FC6 xen kernel does not load the module acpi_cpufreq during boot and is therefore not able to set up speedstep. FATAL: module acpi_cpufreq not found Please advise how I can load this module under xen, since you mention "it *does* work". The reason is: on dual core laptops, missing speedstep is annoying since energy consumption and heat is significantly higher. I think slowing down the whole activity of all xen domains is the expected behavior and I could live with only accounting of cpu activity in dom0. |