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 :D
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.