Windsor Dave L. (AdP/TEF7.1)
2011-Apr-25 13:58 UTC
[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. :-) -- 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 at us.bosch.com
Johnny Hughes
2011-Apr-25 14:26 UTC
[CentOS] 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 :D https://bugzilla.redhat.com/show_bug.cgi?id=581933 However, the advise is good regardless of version of kernel. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 253 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20110425/42531a30/attachment-0005.sig>
Windsor Dave L. (AdP/TEF7.1)
2011-Apr-25 14:44 UTC
[CentOS] 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 :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 Robert Bosch LLC Team Leader, MES Database Infrastructure Group (AdP/TEF7.1) 4421 Highway 81 North Anderson, SC 29621 USA www.bosch.us
Leonard den Ottolander
2011-Apr-26 11:27 UTC
[CentOS] FYI - pci_mmcfg_init kernel error after upgrading to 5.6
Hello Johnny, On Mon, 2011-04-25 at 09:26 -0500, Johnny Hughes wrote:> On 04/25/2011 08:58 AM, Windsor Dave L. (AdP/TEF7.1) wrote: > > 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> 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.Not exactly. That kernel parameter *is* the fix. Regards, Leonard. -- mount -t life -o ro /dev/dna /genetic/research