To say it with other words: CP is not really dispatching userids, but it dispatches virtual CPUs, and only virtual CPU's that want to work (CP knows when a virtual CPU places itself in wait, so it won't dispatch "sleeping" CPUs). An example: suppose you have 3 Linuxes, each with 2 virtual CPUs (that want to work), and 2 CMS users (eg PERFSVM and OPERATOR) that also want to work ==> CP has 3x2 and 2x1 = 8 virtual CPU's to dispatch on 3 IFLs
2010/1/5 Alan Altmark <[email protected]> > On Tuesday, 01/05/2010 at 12:25 EST, "Harris, Nick J." > <[email protected]> wrote: > > > According to our performance product we do NOT need an additional IFL at > this > > time but it was included as part of the z10 upgrade so I wanted to > utilize it. > > It will be utilized even though you do not define three *virtual* CPUs. CP > will be able to run three virtual CPUs at once instead of only two. With > virtual 2-ways, you ensure that no single guest is using all three CPUs at > the same time. > > Alan Altmark > z/VM Development > IBM Endicott > -- Kris Buelens, IBM Belgium, VM customer support
