Performance problem Linux under Zvm

[O'Brien, David W. (NIH/CIT) [C]]

Our shop is new to Zvm and Linux. We have a very small number of Linux users 
who are reporting significant response time problems. It almost seems as if 
each stops running for a period of time and is then re-dispatched.
 
Is there a VM parameter that we might have taken the default on that needs 
tweaking? 
 
Any help or advice appreciated as this is a proof of concept endeavour and we 
would like not to turn off prospective users from the start.
 
Thank you,
Dave O'Brien
National Institutes of Health