We are running linux images with 31 bit addressing under z/VM. The machine arch for our linux images has been defined by our VM sysprog as XA. Is there any disadvantage/advantage of this vs. ESA or some other architecture as far as the linux images are concerned? My initial thought was that the compiler/assembler may choose different instructions for increased effeciency depending on the architecture it's building for, but I don't know if there's any truth to that thought or if there'd even be any differences. Is there any reason to change the architecture, and if so, could the change have any adverse impact?
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