 | | | memory limits to es3, u4, redux | memory limits to es3, u4, redux 2006-06-12 - By Rick Stevens
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On Mon, 2006-06-12 at 11:48 -0700, chuck lawrence wrote:
> > Subject: Re: memory limits to es3, u4
> > From: Bob McClure Jr <bob@(protected)>
> > Date: Fri, 9 Jun 2006 15:26:10 -0500
> > To: Getting started with Red Hat Linux <redhat-install-list@(protected)>
> >
> > On Fri, Jun 09, 2006 at 01:07:18PM -0700, Ron McKeever wrote:
> >
> >>This might help:
> >
> >
> > Here is the URL pasted back together. (#$%&#$ MS Lookout)
> >
> >
> >>http://www.redhat.com/docs/manuals/enterprise/RHEL-3 (See http://HEL-3.ora-code.com)-Manual/sysadmin-guide
/ch-kernel.html
>
> I'll try this, but I've got a couple of questions. I haven't upgraded a
> kernel manually for awhile.
>
> 1. shouldn't the existing kernel see at least 4gb of the 8gb? I'm only
> getting 3gb.
Depends on how you're looking at it. The normal split is 1GB for the
kernel and 3GB for userspace. "cat /proc/meminfo" should show all 4GB
and "free" may only show userspace. I can't recall if it shows all of
it. Unfortunately, my machines with >4GB of RAM use a customized kernel
that splits it 50-50 between kernel and userspace.
> 2. should I try to look for a "bigmem" version that matches the version
> # of my existing kernel? I'm not finding "bigmem" with the right
> version, but I do find "hugemem" (which you or someone suggested). will
> "hugemem" support less than 16gb?
Yes, hugemem is the right beast to use, and it should support 64GB.
> > Also an upgrade to RHES v4 would be a good idea. You get the 2.6.xx
> > kernel. I'm administering a couple of 2x2 Opteron boxes and it sees
> > all four CPUs.
>
> it actually came with es4, but our application vendor doesn't support it
> yet... pity.
Ah, ye ol' "2.4 kernel vs. 2.6 kernel" situation.
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- Rick Stevens, Senior Systems Engineer rstevens@(protected) -
- VitalStream, Inc. http://www.vitalstream.com -
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- I doubt, therefore I might be. -
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