[CentOS] Is 4GB memory the 64bit switch tipping point?
amyagi at gmail.com
Mon Dec 8 12:01:34 UTC 2008
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 . 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
"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 .
Akemi / toracat
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