[rhn-users] Hugemem and bigmem kernels

[Doerbeck, Christoph]

up2date will update whatever is installed on your box.  Note however
that
kernels are usually flagged in the skip list in
/etc/sysconfig/rhn/up2date.
So that'll require a manual up2date -uf.

I've found the AS3 hugemem to be noticeably slower when compared to smp.

But that's expected.  IMHO, hugemem (with the 4/4 memory split) is only
to be used if you absolutely require ~4GB (3.7 GB I think) of 
memory heaps for your app.  I may be using the wrong terms, but they're
close enough.  It's all documented in redhat's verbage / white papers /
etc...

Christoph

-----Original Message-----
From: Jon Etkins [mailto:Jetkins at austinlogistics.com] 
Sent: Friday, June 03, 2005 12:14 PM
To: Red Hat Network Users List
Subject: [rhn-users] Hugemem and bigmem kernels


I have a Dell 6600 with quad 3.0GHz P4's and 16GB of RAM running RHES
AS3.
I'm experiencing slowdowns due to poor memory management which sees
large
amounts of disk I/O bringing the machine to its knees with processes at
75%+ iowait.

I was wondering if a bigmem or hugemem kernel would help this situation,
but up2date only wants to pull the regular EL and ELsmp kernels.  Is
there
a way to have it pull the large memory kernels as well?  If I run
up2date --get kernel-hugemem-2.4.21-4.0.2.EL.i686
will the hugemem kernel be added to the update list from that point on,
or
will I have to manually update it each time?

Thanks,

Jon Etkins
IT Administration & Support
Austin Logistics, Inc
ph:  (512) 651-5641
fax: (512) 329-5625



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