David Kreuter wrote:
Well, I wouldn't go down the road of comparing one linux in an lpar to one
linux virtual machine in an lpar running z/VM. The strength of running z/VM,
well, one of the main ones, is in its ability to run many linux critters
simultaneously. I'd be very careful about what such a comparison intends to
show, and will show.
I've heard various numbers lately 'bout vm overhead. In my experience on z9
class machines, I'm putting it in the less than 5% range, including CP overhead
AND CMS overhead (CMS servers doing systems work). Other numbers I've seen put
it higher, but I don't.
David
I would echo what David says, and would also add that, although you can
share processors with LPAR, you can *not* share memory. Thus, the memory
you (by definition) dedicate to your LPAR is no longer available to
other LPARs.
So be aware that even though, as someone has already pointed out, you
may well see a performance improvement, nothing is free, and something
else on your system will suffer. If it is important for this particular
Linux to have certain performance characteristics, then perhaps you
could achieve that by using some of z/VM's performance knobs and dials
instead?
Ray Mansell
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