-----Original Message----- From: centos-bounces at centos.org [mailto:centos-bounces at centos.org]On Behalf Of William Warren Sent: Saturday, February 10, 2007 11:19 AM To: CentOS mailing list Subject: Re: [CentOS] 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" ============================================ This transmission may contain information that is privileged, confidential and/or exempt from disclosure under applicable law. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or use of the information contained herein (including any reliance thereon) is STRICTLY PROHIBITED. If you received this transmission in error, please immediately contact the sender and destroy the material in its entirety, whether in electronic or hard copy format. Thank you.