This presentation might be of some interest to those looking at the CMM-1 and CMM2/CMMA options: http://www.linuxvm.org/Present/SHARE113/S9272lj.pdf
Enjoy. DJ ----- Original Message ----- From: "Hall, Ken (GTS)" <[email protected]> To: [email protected] Subject: Re: When will CMMA be removed from the kernel? Date: Wed, 23 Sep 2009 11:45:29 -0400 > We tried CMM-1 a month or two ago on a single guest. > Without VMRM, there's nothing for it to talk to, so it > does nothing. (It works by having VMRM send it notices to > decrease working set size.) > > With it enabled on one guest, on a machine slightly memory > constrained, it drove the memory utilization of the guest > down to the point that it wouldn't run at all. Obviously, > it has to be enabled on a significant percentage of your > guests to be useful. > > Most of ours are RHEL4 though, so (I believe) that's out > of the question. We're still evaluating. > > > -----Original Message----- > From: Linux on 390 Port [mailto:[email protected]] > On Behalf Of Michael MacIsaac > Sent: Wednesday, September 23, 2009 10:51 AM > To: [email protected] > Subject: Re: [LINUX-390] When will CMMA be removed from > the kernel? > > Sam, > > > We load the CMM module via > > /etc/sysconfig/kernel > > MODULES_LOADED_ON_BOOT="vmcp cmm" > > > > So what is it that we have turned on? > Good question. You've turned on CMM1 on Linux, but as I > understand it, there must also be a *collaborative* piece > enabled on z/VM. > > In both the latest Virtualization Cookbooks > (ibm.com/redbooks), and the SLES 10 SP2 "read-only" root > paper (linuxvm.org/present), there is a writeup on how to > use CMM1 (much of this section was written by Ray Mansell > - thanks Ray!). Search for "Enabling Collaborative Memory > Management". It discusses how to also enable the > collaborative piece: VMRM > on z/VM. > > I'm curious that Barton wrote on August 28th: > > VMRM has taken so much storage away from servers that > > the server or application dies. I would HIGHLY > recommend against using it. > > But he wrote today: > > CMM-1 has very positive results > > So does CMM-1 have positive results without the > collaborative piece? Barton, could you point to some > numbers showing CMM-1 with positive results without VMRM? > Did you use a different z/VM collaborative piece? Thanks. > > "Mike MacIsaac" <[email protected]> (845) 433-7061 > > ---------------------------------------------------------- > ------------ For LINUX-390 subscribe / signoff / archive > access instructions, send email to [email protected] > with the message: INFO LINUX-390 or visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > > ---------------------------------------------------------- > ---------------- This message w/attachments (message) may > be privileged, confidential or proprietary, and if you are > not an intended recipient, please notify the sender, do > not use or share it and delete it. Unless specifically > indicated, this message is not an offer to sell or a > solicitation of any investment products or other financial > product or service, an official confirmation of any > transaction, or an official statement of Merrill Lynch. > Subject to applicable law, Merrill Lynch may monitor, > review and retain e-communications (EC) traveling through > its networks/systems. The laws of the country of each > sender/recipient may impact the handling of EC, and EC may > be archived, supervised and produced in countries other > than the country in which you are located. This message > cannot be guaranteed to be secure or error-free. > References to "Merrill Lynch" are references to any > company in the Merrill Lynch & Co., Inc. group of > companies, which are wholly-owned by Bank of America > Corporation. Securities and Insurance Products: * Are Not > FDIC Insured * Are Not Bank Guaranteed * May Lose Value * > Are Not a Bank Deposit * Are Not a Condition to Any > Banking Service or Activity * Are Not Insured by Any > Federal Government Agency. Attachments that are part of > this E-communication may have additional important > disclosures and disclaimers, which you should read. This > message is subject to terms available at the following > link: http://www.ml.com/e-communications_terms/. By > messaging with Merrill Lynch you consent to the foregoing. > ---------------------------------------------------------- > ---------------- > > > ---------------------------------------------------------- > ------------ For LINUX-390 subscribe / signoff / archive > access instructions, send email to [email protected] > with the message: INFO LINUX-390 or visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
