Bug 426096
| Summary: | Xenoprof check_ctrs/start/stop fixes for intel family 6 | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | Markus Armbruster <armbru> |
| Component: | kernel-xen | Assignee: | Markus Armbruster <armbru> |
| Status: | CLOSED ERRATA | QA Contact: | Martin Jenner <mjenner> |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | 5.1 | CC: | bburns, dzickus, mgahagan, slabanja, xen-maint |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: |
On Intel processors that return a CPUID family value of 6, only one performance counter register was enabled in kernel-xen. Consequently, only counter 0 provided samples. In this update, this issue has been resolved.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2009-01-20 20:21:15 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: | |||
| Bug Blocks: | 448753, 454962, 458824 | ||
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Description
Markus Armbruster
2007-12-18 15:04:12 UTC
Author of cset 16614 explains: Yes, c/s 16614 is a simple and clean fix of xenoprof. Previous code enables only one hardware performance monitoring register in Xen HV regardless of how many the user want to use. If xenoprof is not used, it has no other effect. This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release. in kernel-2.6.18-104.el5 You can download this test kernel from http://people.redhat.com/dzickus/el5 I think I accidentally changed this, but I it doesn't look like I included the patch yet. in kernel-2.6.18-107.el5 You can download this test kernel from http://people.redhat.com/dzickus/el5 This bug (feature request) has been marked for inclusion in the Red Hat Enterprise Linux 5.3 Release Notes. To aid in the development of relevant and accurate release notes, please fill out the "Release Notes" field above with the following 4 pieces of information: Cause: What actions or circumstances induced the feature request. Consequence: What action was inhibited by the feature's absence. Fix: What was done to implement the feature. Result: now happens when the actions or circumstances above occur. (NB: this is not the same as 'the feature request was fulfilled') Release note added. If any revisions are required, please set the "requires_release_notes" flag to "?" and edit the "Release Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: Cause: intel family 6 CPUs provide several performance counter registers, but we enabled only one. Consequence: Only counter 0 provides samples. Other counters don't produce samples. Fix: Backport relevant fixes from upstream. Result: All counters produce samples. Note that the above actually covers two bzs: this one (Xen) and bug 458824 (bare metal). Release note updated. If any revisions are required, please set the "requires_release_notes" flag to "?" and edit the "Release Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. Diffed Contents: @@ -1,12 +1 @@ -Cause: intel family 6 CPUs provide several performance counter +On Intel processors that return a CPUID family value of 6, only one performance counter register was enabled in kernel-xen. Consequently, only counter 0 provided samples. In this update, this issue has been resolved.-registers, but we enabled only one. - -Consequence: Only counter 0 provides samples. Other counters don't -produce samples. - -Fix: Backport relevant fixes from upstream. - -Result: All counters produce samples. - -Note that the above actually covers two bzs: this one (Xen) and bug -458824 (bare metal). An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2009-0225.html *** Bug 430474 has been marked as a duplicate of this bug. *** |