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Old 04-25-2011, 01:58 PM
"Windsor Dave L. (AdP/TEF7.1)"
 
Default FYI - pci_mmcfg_init kernel error after upgrading to 5.6

Just thought I'd pass along an error I received this weekend after
upgrading two servers to 5.6. Both are HP Proliant DL380 servers
running 64-bit, but one is a G6 model and one is a G7. After the
upgrade and the reboot to the 2.6.18-238.9.1.el5 kernel, both servers
displayed the following error at boot:
"pci_mmcfg_init marking 256MB space uncacheable."

Some Googling found me the following link:
https://partner-bugzilla.redhat.com/show_bug.cgi?id=581933

There are apparently performance implications due to this issue.
Fortunately, the solution is simple: just boot with the kernel parameter
acpi_mcfg_max_pci_bus_num=on

If everyone is already familiar with this, please ignore. :-)

--
Best Regards,

Dave Windsor

Robert Bosch LLC
Team Leader, MES Database Infrastructure Group (AdP/TEF7.1)
4421 Highway 81 North
Anderson, SC 29621 USA
www.bosch.us

Tel: 1 (864) 260-8459
Fax: 1 (864) 260-8422
Dave.Windsor@us.bosch.com


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Old 04-25-2011, 02:26 PM
Johnny Hughes
 
Default FYI - pci_mmcfg_init kernel error after upgrading to 5.6

On 04/25/2011 08:58 AM, Windsor Dave L. (AdP/TEF7.1) wrote:
> Just thought I'd pass along an error I received this weekend after
> upgrading two servers to 5.6. Both are HP Proliant DL380 servers
> running 64-bit, but one is a G6 model and one is a G7. After the
> upgrade and the reboot to the 2.6.18-238.9.1.el5 kernel, both servers
> displayed the following error at boot:
> "pci_mmcfg_init marking 256MB space uncacheable."
>
> Some Googling found me the following link:
> https://partner-bugzilla.redhat.com/show_bug.cgi?id=581933
>
> There are apparently performance implications due to this issue.
> Fortunately, the solution is simple: just boot with the kernel parameter
> acpi_mcfg_max_pci_bus_num=on
>
> If everyone is already familiar with this, please ignore. :-)
>

Supposedly this issue is fixed in the 5.6 kernel ... not introduced in it

https://bugzilla.redhat.com/show_bug.cgi?id=581933

However, the advise is good regardless of version of kernel.

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Old 04-25-2011, 02:44 PM
"Windsor Dave L. (AdP/TEF7.1)"
 
Default FYI - pci_mmcfg_init kernel error after upgrading to 5.6

On 4/25/2011 10:26 AM, Johnny Hughes wrote:
> On 04/25/2011 08:58 AM, Windsor Dave L. (AdP/TEF7.1) wrote:
>> Just thought I'd pass along an error I received this weekend after
>> upgrading two servers to 5.6. Both are HP Proliant DL380 servers
>> running 64-bit, but one is a G6 model and one is a G7. After the
>> upgrade and the reboot to the 2.6.18-238.9.1.el5 kernel, both servers
>> displayed the following error at boot:
>> "pci_mmcfg_init marking 256MB space uncacheable."
>>
>> Some Googling found me the following link:
>> https://partner-bugzilla.redhat.com/show_bug.cgi?id=581933
>>
>> There are apparently performance implications due to this issue.
>> Fortunately, the solution is simple: just boot with the kernel parameter
>> acpi_mcfg_max_pci_bus_num=on
>>
>> If everyone is already familiar with this, please ignore. :-)
>>
>
> Supposedly this issue is fixed in the 5.6 kernel ... not introduced in it
>
> https://bugzilla.redhat.com/show_bug.cgi?id=581933
>
> However, the advise is good regardless of version of kernel.
>


Yes, I saw the reference to RHEL 5.5 in the bug description, but I never
saw the message before the upgrade to CentOS 5.6. Hardware differences,
I guess. The bug description mentions a Dell Precision.

Best Regards,

Dave Windsor

Robert Bosch LLC
Team Leader, MES Database Infrastructure Group (AdP/TEF7.1)
4421 Highway 81 North
Anderson, SC 29621 USA
www.bosch.us
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Old 04-25-2011, 03:19 PM
Ned Slider
 
Default FYI - pci_mmcfg_init kernel error after upgrading to 5.6

On 25/04/11 15:44, Windsor Dave L. (AdP/TEF7.1) wrote:
> On 4/25/2011 10:26 AM, Johnny Hughes wrote:
>> On 04/25/2011 08:58 AM, Windsor Dave L. (AdP/TEF7.1) wrote:
>>> Just thought I'd pass along an error I received this weekend after
>>> upgrading two servers to 5.6. Both are HP Proliant DL380 servers
>>> running 64-bit, but one is a G6 model and one is a G7. After the
>>> upgrade and the reboot to the 2.6.18-238.9.1.el5 kernel, both servers
>>> displayed the following error at boot:
>>> "pci_mmcfg_init marking 256MB space uncacheable."
>>>
>>> Some Googling found me the following link:
>>> https://partner-bugzilla.redhat.com/show_bug.cgi?id=581933
>>>
>>> There are apparently performance implications due to this issue.
>>> Fortunately, the solution is simple: just boot with the kernel parameter
>>> acpi_mcfg_max_pci_bus_num=on
>>>
>>> If everyone is already familiar with this, please ignore. :-)
>>>
>>
>> Supposedly this issue is fixed in the 5.6 kernel ... not introduced in it
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=581933
>>
>> However, the advise is good regardless of version of kernel.
>>
>
>
> Yes, I saw the reference to RHEL 5.5 in the bug description, but I never
> saw the message before the upgrade to CentOS 5.6. Hardware differences,
> I guess. The bug description mentions a Dell Precision.
>
> Best Regards,
>
> Dave Windsor
>

I saw and reported the issue during QA for CentOS-5.6.

I think it's quite widespread, I saw it on generic Intel-based motherboards.

I've not had any issues applying the documented "fix" and have been
running that since January.

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Old 04-25-2011, 09:15 PM
Johnny Hughes
 
Default FYI - pci_mmcfg_init kernel error after upgrading to 5.6

On 04/25/2011 10:19 AM, Ned Slider wrote:
> On 25/04/11 15:44, Windsor Dave L. (AdP/TEF7.1) wrote:
>> On 4/25/2011 10:26 AM, Johnny Hughes wrote:
>>> On 04/25/2011 08:58 AM, Windsor Dave L. (AdP/TEF7.1) wrote:
>>>> Just thought I'd pass along an error I received this weekend after
>>>> upgrading two servers to 5.6. Both are HP Proliant DL380 servers
>>>> running 64-bit, but one is a G6 model and one is a G7. After the
>>>> upgrade and the reboot to the 2.6.18-238.9.1.el5 kernel, both servers
>>>> displayed the following error at boot:
>>>> "pci_mmcfg_init marking 256MB space uncacheable."
>>>>
>>>> Some Googling found me the following link:
>>>> https://partner-bugzilla.redhat.com/show_bug.cgi?id=581933
>>>>
>>>> There are apparently performance implications due to this issue.
>>>> Fortunately, the solution is simple: just boot with the kernel parameter
>>>> acpi_mcfg_max_pci_bus_num=on
>>>>
>>>> If everyone is already familiar with this, please ignore. :-)
>>>>
>>>
>>> Supposedly this issue is fixed in the 5.6 kernel ... not introduced in it
>>>
>>> https://bugzilla.redhat.com/show_bug.cgi?id=581933
>>>
>>> However, the advise is good regardless of version of kernel.
>>>
>>
>>
>> Yes, I saw the reference to RHEL 5.5 in the bug description, but I never
>> saw the message before the upgrade to CentOS 5.6. Hardware differences,
>> I guess. The bug description mentions a Dell Precision.
>>
>> Best Regards,
>>
>> Dave Windsor
>>
>
> I saw and reported the issue during QA for CentOS-5.6.
>
> I think it's quite widespread, I saw it on generic Intel-based motherboards.
>
> I've not had any issues applying the documented "fix" and have been
> running that since January.

Well if this is wipe spread then we need to add this to the Release
Notes too ... I'll take care of that if it is not already there.

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Old 04-25-2011, 09:32 PM
"Windsor Dave L. (AdP/TEF7.1)"
 
Default FYI - pci_mmcfg_init kernel error after upgrading to 5.6

On 4/25/2011 5:15 PM, Johnny Hughes wrote:
> On 04/25/2011 10:19 AM, Ned Slider wrote:
>> On 25/04/11 15:44, Windsor Dave L. (AdP/TEF7.1) wrote:

<removed>

>>
>> I saw and reported the issue during QA for CentOS-5.6.
>>
>> I think it's quite widespread, I saw it on generic Intel-based motherboards.
>>
>> I've not had any issues applying the documented "fix" and have been
>> running that since January.
>
> Well if this is wipe spread then we need to add this to the Release
> Notes too ... I'll take care of that if it is not already there.
>

I looked in the 5.6 Release Notes on the Wiki and didn't see it under
"Known Problems" or anywhere else.

Thanks!

Best Regards,

Dave Windsor
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Old 04-26-2011, 12:33 AM
Johnny Hughes
 
Default FYI - pci_mmcfg_init kernel error after upgrading to 5.6

On 04/25/2011 04:32 PM, Windsor Dave L. (AdP/TEF7.1) wrote:
> On 4/25/2011 5:15 PM, Johnny Hughes wrote:
>> On 04/25/2011 10:19 AM, Ned Slider wrote:
>>> On 25/04/11 15:44, Windsor Dave L. (AdP/TEF7.1) wrote:
>
> <removed>
>
>>>
>>> I saw and reported the issue during QA for CentOS-5.6.
>>>
>>> I think it's quite widespread, I saw it on generic Intel-based motherboards.
>>>
>>> I've not had any issues applying the documented "fix" and have been
>>> running that since January.
>>
>> Well if this is wipe spread then we need to add this to the Release
>> Notes too ... I'll take care of that if it is not already there.
>>
>
> I looked in the 5.6 Release Notes on the Wiki and didn't see it under
> "Known Problems" or anywhere else.
>

It should be the last entry under known problems now.

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