On Sun, Dec 7, 2008 at 11:02 PM, Ignacio Vazquez-Abrams <ivazqueznet at gmail.com> wrote: > On Sun, 2008-12-07 at 23:06 -0700, Kenneth Burgener wrote: >> >> 1. 4GB Memory. I'd like to add a note regarding the 4G/4G split issue. Unlike hugemem in CentOS/RHEL-4, the PAE kernel in CentOS/RHEL-5 does not provide 4GB per user process. In this regard, there is no hugemem-equivalent in CentOS/RHEL-5. This was mentioned in the upstream bugzilla [1]. In other words, applications that can take advantage of 4GB per process should benefit from the 64-bit. There is a description in section 40.1 (kernel-PAE) of the CentOS online documentation: "4GB/4GB split: 4GB of virtual address space for the kernel and almost 4GB for each user process on x86 systems" This is incorrect and has been removed from the same page upstream. I filed a bug report regarding updating the CentOS lnline doc [2]. [1] https://bugzilla.redhat.com/show_bug.cgi?id=241314 [2] http://bugs.centos.org/view.php?id=3231 Akemi / toracat