Found it:
https://www.ibm.com/docs/en/zvse/6.2?topic=addressing-ccw-formats
"Note: Use format-1 CCWs only if necessary. When running under VM, the
format-1 CCW translation affects the VM guest performance."
Tony Thigpen
Tony Thigpen wrote on 9/18/23 4:22 PM:
Dave,
I have been looking at the same thing. One thing I came across, and am
now looking for again, was that format 1 CCWs are bad under VM.
Tony Thigpen
Dave Clark wrote on 9/18/23 4:08 PM:
I found some sample assembler code for doing this, but it leaves me
asking a few questions... The sample I found uses a format 0 CCW but my
program uses a format 1 CCW. Does that preclude using an appendage
routine
or is it six of one and half dozen of the other? I suppose there is no
reason that I am attached to using a format 1 CCW but I'm making this
change to a program I've had around for years and was hoping for minimal
changes. I've tried looking at two or three different manuals and I just
can't find much on using appendage routines. So, either information
around
the first question or point me to a definitive manual would be
appreciated.
Sincerely,
Dave Clark
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