[CentOS] 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. :-)