In <[email protected]>, on
02/15/2012
at 07:10 AM, Joe Owens <[email protected]> said:
>My understanding of the channel program is that it moves the data
>into the page fixed I/O buffer and the interupt a cp to process the
>I/O. How is the candidate CP chosen? I know the z/os system may make
>some CPUs uninteruptable for I/Os based on CPENABLE, but of the CPs
>that are enabled, how is one chosen? Is it at the physical or logical
>level and how is it related to the LPAR which requested the I/O?
An I/O is associated with an LPAR; the CE/DE interrupt is always
presented to the LPAR that requested the I/O. As to which of the
enabled processors it goes to on the LPAR, that's not architected and
is probably model dependent.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see <http://patriot.net/~shmuel/resume/brief.html>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
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