[CentOS] FYI - pci_mmcfg_init kernel error after upgrading to 5.6

Mon Apr 25 14:26:16 UTC 2011
Johnny Hughes <johnny at centos.org>

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 :D


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

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