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Bug 178845

Summary:

RHEL4u4 FEAT: Provide support for Opteron Rev G and Power Now! clean-up

Product:

Red Hat Enterprise Linux 4

Reporter:

Bhavna Sarathy <bnagendr>

Component:

kernel

Assignee:

Bhavna Sarathy <bnagendr>

Status:

CLOSED ERRATA

QA Contact:

Brian Brock <bbrock>

Severity:

medium

Docs Contact:

Priority:

medium

Version:

4.0

CC:

jbaron

Target Milestone:

---

Keywords:

FutureFeature

Target Release:

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Hardware:

x86_64

OS:

Linux

Whiteboard:

Fixed In Version:

RHSA-2006-0575

Doc Type:

Enhancement

Doc Text:

Story Points:

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Clone Of:

Environment:

Last Closed:

2006-08-10 21:56:12 UTC

Type:

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Regression:

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Mount Type:

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Documentation:

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CRM:

Verified Versions:

Category:

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oVirt Team:

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RHEL 7.3 requirements from Atomic Host:

Cloudforms Team:

---

Target Upstream Version:

Embargoed:

Bug Depends On:

176273

Bug Blocks:

181411

Attachments:

Description	Flags
This patch cleans up some error messages in the powernow-k8 driver and makes it more understandable.	none
This patch enables the powernow-k8 driver to transition to an odd FID code, indicating a multiple of 100 MHz frequency.	none

Description Bhavna Sarathy 2006-01-24 19:18:16 UTC

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.7.5) Gecko/20041215 Firefox/1.0 Red Hat/1.0-12.EL4

Description of problem:
pn_cleanup.patch: This patch cleans up some error messages in the powernow-k8 driver and makes them more understandable.

pnk8-odd-fid.patch: Future versions of the Opteron processor may support frequency transitions of 100 MHz, instead of the current 200 MHz.  This patch enables the powernow-k8 driver to transition to an odd FID code, indicating a multiple of 100 MHz frequency. 



Version-Release number of selected component (if applicable):


How reproducible:
Didn't try

Steps to Reproduce:
The patches are for Power Now cleanup and a Power Now feature request to support Opteron Rev G.  Not a bug.

  

Actual Results:  Test Results:

Running 2.6.9-28.EL on dual core Opteron.

[bhavana@dhcp83-37 Patches]$ dmesg| grep power
powernow-k8: Found 1 AMD Athlon 64 / Opteron processors (version 1.00.09b)
powernow-k8:    0 : fid 0x8 (1600 MHz), vid 0xa (1300 mV)
powernow-k8:    1 : fid 0x0 (800 MHz), vid 0x16 (1000 mV)
powernow-k8: cpu_init done, current fid 0x0, vid 0x16

[bhavana@dhcp83-37 Patches]$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
800000

Change the scaling_cur_freq.
[root@dhcp83-37 Patches]# echo -n "24000000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq

Create load on the system by building the Linux kernel or by executing
a processor intensive program and verify the scaling_cur_freq as load varies.

[root@dhcp83-37 Patches]# while true; do cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq;sleep1; clear; done

The Rev G processors are in production now and are not available for testing.
Soon as they are sent to me, I can test this on the relevant processor.  Hopefully this should not hold up the patch acceptance process.


Additional info:

The patches related to this feature (sent to rhkernel-list) have been submitted upstream to 2.6.16-rc1.

Comment 1 Bhavna Sarathy 2006-01-24 19:21:55 UTC

Created attachment 123630 [details]
This patch cleans up some error messages in the powernow-k8 driver and makes it more understandable.

Series of two patches, apply this one first.

Comment 2 Bhavna Sarathy 2006-01-24 19:23:25 UTC

Created attachment 123631 [details]
This patch enables the powernow-k8 driver to transition to an odd FID code, indicating a multiple of 100 MHz frequency. 

Apply this patch after applying pn_cleanup patch.

Comment 3 Jason Baron 2006-03-17 16:46:36 UTC

committed in stream U4 build 34.4. A test kernel with this patch is available
from http://people.redhat.com/~jbaron/rhel4/

Comment 8 Red Hat Bugzilla 2006-08-10 21:56:13 UTC

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 the 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-2006-0575.html