Description of problem: Intel recommends to not use large pages for the first 1MB of the physical memory because there are fixed size MTRRs there which cause splitups in the TLBs. Version-Release number of selected component (if applicable): RHEL5-U3 How reproducible: N/A Steps to Reproduce: 1. 2. 3. Actual results: Using 2MB pages for first 2MB of kernel memory Expected results: Use 4KB pages for first 2MB of kernel memory. Additional info:
Created attachment 311875 [details] Patch to use 4KB pages for first 2MB of kernel space.
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release.
in kernel-2.6.18-109.el5 You can download this test kernel from http://people.redhat.com/dzickus/el5
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2009-0225.html