I wouldn't add the 3rd IFL to the Directory for the Linux guests. Just leave it as another engine for CP to dispatch work on.
On Tue, Jan 5, 2010 at 10:39 AM, Stock, Roger W <[email protected]> wrote: > TIA, > The z10BC IFLs are about 50% faster that the z9BC IFL. > So, you are already getting more CPU power. > If you over assign IFLs to a guest, it may just cause spin locks preventing > other guests from getting CPs that the first guests has been assigned but is > not using. > See if they really need the third IFL (i.e. are they running 100% on two > IFL) before adding a third to their user directory entry. > > Roger > > ------------------------------ > *From:* The IBM z/VM Operating System [mailto:[email protected]] *On > Behalf Of *Harris, Nick J. > *Sent:* Tuesday, January 05, 2010 10:32 AM > *To:* [email protected] > *Subject:* 2 to 3 IFLs > > Hello All, > > > > We are upgrading our z9BC to a z10BC and increasing the IFLs from two to > three. I am planning on modifying the Linux guest definitions to utilize > the third IFL. Are there any performance issues or problems adding a third > IFL? I can’t imagine this would do anything but help, I’m just checking. > > > > We are running z/VM 5.4 in support of Linux guests. > > > > TIA! > > > > > > > > *Nick Harris* > > Lead Systems Programmer, Information Systems > > [email protected] > > Texas Farm Bureau Insurance Companies > > P. O. Box 2689 Waco, TX. 76702-2689 > > Phone 254.751.2259 > > * * > > > > > > <http://www.txfb-ins.com/> <http://www.txfb-ins.com> > > <http://www.txfb-ins.com> <http://www.txfb-ins.com> > > CONFIDENTIALITY STATEMENT: The foregoing message (including attachments) is > covered by the Electronic Communication Privacy Act, 18 U.S.C. sections > 2510-2521, and is CONFIDENTIAL. If you believe that it has been sent to you > in error, do not read it. If you are not the intended recipient, you are > hereby notified that any retention, dissemination, distribution, or copying > of this communication is strictly prohibited. Please reply to the sender > that you have received the message in error, then delete it. Thank you. > > . > > > > <http://www.txfb-ins.com> > > -- Mark Pace Mainline Information Systems 1700 Summit Lake Drive Tallahassee, FL. 32317
