=Comment: #0================================================= Emily J. Ratliff <ratliff.com> - 1. Feature Overview: Feature Id: [200975] a. Name of Feature: System z support for processor degradation b. Feature Description z990, z890 and later systems may reduce processor speed in case of cooling problems. This is observed thru SCLP event type 4 event qualifier 3 (processor capacity change). Further, STSI will report the new capacity. This feature triggers an uevent and issues issue a warning to Syslog. This enables automation software to observe the machine state and act based on policies, as applicable. 2. Feature Details: Sponsor: zSeries Architectures: s390x Arch Specificity: Purely Arch Specific Code Affects Core Kernel: Yes Delivery Mechanism: Backport Category: Kernel Request Type: Kernel - Enhancement from IBM d. Upstream Acceptance: Accepted Sponsor Priority 1 f. Severity: High IBM Confidential: no Code Contribution: IBM code g. Component Version Target: 2.6.22 3. Business Case RAS Item to increase system availability. Prereq for automation software to take self-healing actions. 4. Primary contact at Red Hat: John Jarvis jjarvis 5. Primary contacts at Partner: Project Management Contact: Hans-Georg Markgraf, mgrf.com, Boeblingen 49-7031-16-3978 Technical contact(s): Gonzalo Muelas Serrano, gmuelas.com IBM Manager: Thomas Schwarz, t.schwarz.com
IBM is signed up to test and provide feedback.
Created attachment 329805 [details] linux-2.6.18-s390-cpu-degradation.patch
The patch has been posted to rhkernel on Feb 12. by Hans-Joachim Picht <hpicht>
Updating PM score.
Please, do not forget to update documentation and/or release notes: Provides support for processor degradation in case of, for example, cooling problems. This is supported on z990, z890 and later systems and is observed through SCLP event type ???4??? event qualifier ???3??? Further, STSI will report the new capacity, which can be read via /sys/devices/system/cpu/cpuN/capability. This enables automation software to observe the machine state and act based on policies, as applicable. Thank you!
This enhancement request was evaluated by the full Red Hat Enterprise Linux team for inclusion in a Red Hat Enterprise Linux minor release. As a result of this evaluation, Red Hat has tentatively approved inclusion of this feature in the next Red Hat Enterprise Linux Update minor release. While it is a goal to include this enhancement in the next minor release of Red Hat Enterprise Linux, the enhancement is not yet committed for inclusion in the next minor release pending the next phase of actual code integration and successful Red Hat and partner testing.
------- Comment From mgrf.com 2009-04-27 12:40 EDT------- Hello Red Hat, Hi John, What is the status regarding RHEL 5.4 acceptance for this feature?
As I noted in my March 2 comment, this feature is approved for RHEL 5.4.
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: Provides support for processor degradation in case of, for example, cooling problems. This is supported on z990, z890 and later systems and is observed through SCLP event type 4 event qualifier 3. Further, STSI will report the new capacity, which can be read via /sys/devices/system/cpu/cpuN/capability. This enables automation software to observe the machine state and act based on policies, as applicable.
~~ Attention Partners RHEL 5.4 Partner Alpha Released! ~~ RHEL 5.4 Partner Alpha has been released on partners.redhat.com. There should be a fix present that addresses this particular request. Please test and report back your results here, at your earliest convenience. Our Public Beta release is just around the corner! If you encounter any issues, please set the bug back to the ASSIGNED state and describe the issues you encountered. If you have verified the request functions as expected, please set your Partner ID in the Partner field above to indicate successful test results. Do not flip the bug status to VERIFIED. Further questions can be directed to your Red Hat Partner Manager. Thanks!
~~ Attention - RHEL 5.4 Beta Released! ~~ RHEL 5.4 Beta has been released! There should be a fix present in the Beta release that addresses this particular request. Please test and report back results here, at your earliest convenience. RHEL 5.4 General Availability release is just around the corner! If you encounter any issues while testing Beta, please describe the issues you have encountered and set the bug into NEED_INFO. If you encounter new issues, please clone this bug to open a new issue and request it be reviewed for inclusion in RHEL 5.4 or a later update, if it is not of urgent severity. Please do not flip the bug status to VERIFIED. Only post your verification results, and if available, update Verified field with the appropriate value. Questions can be posted to this bug or your customer or partner representative.
Adjusted formatting of release notes
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: @@ -1,4 +1,4 @@ -Provides support for processor degradation in case of, for example, cooling problems. -This is supported on z990, z890 and later systems and is observed through SCLP event type 4 event qualifier 3. Further, STSI will report the new capacity, which can be read via +Provides support for processor degradation in case of, for example, cooling problems. This is supported on z990, z890 and later systems and is observed through SCLP event type 4 event qualifier 3. Further, STSI will report the new capacity, which can be read via /sys/devices/system/cpu/cpuN/capability. -This enables automation software to observe the machine state and act based on policies, as applicable.+ +This enables automation software to observe the machine state and act based on policies, as applicable.
~~ Attention Partners - RHEL 5.4 Snapshot 1 Released! ~~ RHEL 5.4 Snapshot 1 has been released on partners.redhat.com. If you have already reported your test results, you can safely ignore this request. Otherwise, please notice that there should be a fix available now that addresses this particular request. Please test and report back your results here, at your earliest convenience. The RHEL 5.4 exception freeze is quickly approaching. If you encounter any issues while testing Beta, please describe the issues you have encountered and set the bug into NEED_INFO. If you encounter new issues, please clone this bug to open a new issue and request it be reviewed for inclusion in RHEL 5.4 or a later update, if it is not of urgent severity. Do not flip the bug status to VERIFIED. Instead, please set your Partner ID in the Verified field above if you have successfully verified the resolution of this issue. Further questions can be directed to your Red Hat Partner Manager or other appropriate customer representative.
------- Comment From mgrf.com 2009-07-14 04:59 EDT------- This feature is verified OK on RHEL 5.4 beta. Closing feature request. Thanks
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: @@ -1,4 +1,3 @@ -Provides support for processor degradation in case of, for example, cooling problems. This is supported on z990, z890 and later systems and is observed through SCLP event type 4 event qualifier 3. Further, STSI will report the new capacity, which can be read via -/sys/devices/system/cpu/cpuN/capability. +Red Hat Enterprise Linux 5.4 adds support for processor degradation, which allows processor speed to be reduced in some circumstances (i.e. system overheating). This new feature allows automation software to observe the machine state and act based on defined policies. -This enables automation software to observe the machine state and act based on policies, as applicable.+Processor degradation is supported on z990, z890 and later systems and is observed through SCLP system service event type 4 event qualifier 3. STSI will report the new capacity of the processor in the file: <filename>/sys/devices/system/cpu/cpuN/capability</filename>.
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-2009-1243.html