Bug 455447
Summary: | FEAT: RHEL 5.3: (1/2) Increase deep idle state residency on idle platforms using Nehalem class processors | ||||||
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Product: | Red Hat Enterprise Linux 5 | Reporter: | John Villalovos <jvillalo> | ||||
Component: | kernel | Assignee: | John Feeney <jfeeney> | ||||
Status: | CLOSED ERRATA | QA Contact: | Martin Jenner <mjenner> | ||||
Severity: | high | Docs Contact: | |||||
Priority: | high | ||||||
Version: | 5.3 | CC: | andriusb, austin.zhang, bmaly, cward, gcase, jane.lv, jvillalo, keve.a.gabbert, venkatesh.pallipadi, youquan.song | ||||
Target Milestone: | rc | Keywords: | FutureFeature | ||||
Target Release: | --- | ||||||
Hardware: | All | ||||||
OS: | Linux | ||||||
Whiteboard: | |||||||
Fixed In Version: | Doc Type: | Enhancement | |||||
Doc Text: | Story Points: | --- | |||||
Clone Of: | Environment: | ||||||
Last Closed: | 2009-01-20 20:02:05 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: | 428015, 455449, 455516 | ||||||
Attachments: |
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Description
John Villalovos
2008-07-15 15:26:41 UTC
I am going to attach the simpler patch to this bug. Together the two patches increase the deep idle state residency on an idle platform and performance/power team folks found >16W savings with these two patches out of total 220W idle power, which is 7-8%. Of the two patches, first one is simpler and bigger savings and should be easier to push. Created attachment 311847 [details]
Patch for this bug
Applying this and 455449, I'm not obviously seeing any increase in C3 residency (using powertop as a measuring tool). Is there a recommended way to perform this measurement? Venki, Can you answer the question about C3 residency? in kernel-2.6.18-113.el5 You can download this test kernel from http://people.redhat.com/dzickus/el5 Partners, this bug should be fixed in the latest RHEL 5.3 Snapshot. We believe that you have some interest in its correct functionality, so we're making a friendly request to send us some testing feedback. If you have a chance to test it, please share with us your findings. If you have successfully VERIFIED the fix, please add PartnerVerified to the Bugzilla keywords, along with a description of the results. Thanks! Verify on Tylersburg EP, the bug was fixed. Verify on Tylersburg EP, the bug was fixed. 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 |