On Friday, 07/10/2015 at 02:09 EDT, "Pavelka, Tomas" <[email protected]> wrote: > Where the s390 is different is that it uses large continuous buffers all over.
I wouldn't really put that at the feet of s390 (z/Architecture). As you noted, the DIAGNOSE 0x08 problem is because CP requires the buffer to be contiguous guest-absolute memory. It has never been enhanced to use scatter/gather the way other DIAGNOSE instructions have. (And the way most of the architecture operates.) That would enable vmcp to request logically contiguous memory that would be backed by memory that's discontiguous page frames. Alan Altmark Senior Managing z/VM and Linux Consultant Lab Services System z Delivery Practice IBM Systems & Technology Group ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 [email protected] IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
