So the linux guest is running under z/VM which is running under z/VM in an LPAR? Although there have allegedly been improvements you are running a virtualized SIE environment if the answer to the above question is yes. Can you somehow run the linux guest under the z/VM on the LPAR, eliminating a level of SIE virtualization? I think this would show, um, interesting results as in much faster. David
________________________________ From: The IBM z/VM Operating System on behalf of Howard Rifkind Sent: Tue 10/21/2008 8:33 PM To: IBMVM@LISTSERV.UARK.EDU Subject: [IBMVM] Very Slow Linux Running Second Level z/VM Hello all, We are testing at our D/R site. We are running our z/VM under the D/R sites z/VM. z/VM, both first and second level running like gang busters along with one z/OS and VSE guest, plus other minor z/VM user ids. Processor is a z9 and the lpars are all weighted equally. At present we have 3 processors dedicated to us and no one else is using the z9 and Linux is running in our z/VM. There isn't any paging at first level and almost no paging at second level yet when we bring up one Linux guest it is very very slow and nothing is showing up in any of the monitoring tools. We aren't running in an IFL, no IFL's on this z9. It also seems that the only portion of this is that is really very slow is the JVM linux machines or JVM within Linux is what is killing us. (hope I defined the question correctly) Any suggestions were to look and what we can try to impove the situation would be appreciated. Thanks
