Re: z/VM 5.2 on z800 with 8G of memory

[Bill Bitner]

One of the caveats of using MDC and Xstore is whether your
workload is CMS or VSE based vs. Linux. Many of the traditional
workloads can run fine with some xstore for MDC because we
can move the data directly to the guest space from xstore if the
data buffers are page aligned (which isn't uncommon for
the traditional workloads). If they are not page aligned, then
as Rob mentioned, CP first needs to move them into CP owned
frames before moving into the guest space.