-----Original Message-----
From: centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx]On
Behalf Of William Warren
Sent: Saturday, February 10, 2007 11:19 AM
To: CentOS mailing list
Subject: Re: CentOS 3 vs. CentOS 4 Memory Utilization
yes i did. The 2.4x Rh kernels actually aren't right in their swapping
behavior. it really nailed my samba server here at the house and caused
massive swapping and load issues on a friend's gaming server. i don't
know what it is about RH's 2.4x kernels but they swap and won't give the
cache memory back. I have more than 6 ipcop firewalls based on 2.4
kernels(not RH) and they won't swap unless you actually exhaust physical
memory. The issue is the RH 2.4x kernels which for some reason continue
to swap even with 500 MEGS of cache memory available to take back. 2.6x
runs much better and actually obeys the swappiness commands. Even the
various patches done by Rh on the 2.4x kernel never reduces this behavior.
Les Mikesell wrote:
> William Warren wrote:
>> i moved away from Red Hat 2.4x kernels as they have an annoying
>> tendency to swap instead of giving back cache. I moved to Centos-4
>> and i have vm.swappiness to zero and am using at most 144K of swap
>> across 5 machines.
>
> Did you see any real-world improvement from this? The kernel may be
> right in swapping out little-used parts of memory to release RAM for
> something more likely to be active.
>
--
My "Foundation" verse:
Isa 54:17 No weapon that is formed against thee shall prosper; and
every tongue that shall rise against thee in judgment thou shalt
condemn. This is the heritage of the servants of the LORD, and their
righteousness is of me, saith the LORD.
-- carpe ductum -- "Grab the tape"
CDTT (Certified Duct Tape Technician)
Linux user #322099
Machines:
206822
256638
276825
http://counter.li.org/
_______________________________________________
I HAVE to agree with this assessment. We tried everything issued from RedHat, patches, new kernels, and new
settings, and could never get this under control. Since we had no software tied to Version 3 we
finally gave up and migrated all of our systems to Version 4. There have been no problems like
those we had with Ver. 3 since.
============================================
Fred Kienker
AT4B
5261 Sunset Trail
Marietta, GA 30068
Fred at at4b.com
770.518.6166 Phone
770.518.6992 Fax
"Advanced Technologies For Business"
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