> Jim Mulder had a superb analysis of this. Basically VSM goes > through the DQE chain for 4K pages and bypasses it for 8K > pages. In addition, with each GETMAIN of a 4K page, the DQE > chain is one entry longer. > > I do not try it with page boundaries and I did not try STORAGE.
STORAGE would not be any faster. The entry is via a PC instead of an SVC, so that part is faster. After that, the PC logic has a lot more conditions to check because it is vastly more flexible than the SVC interface (e.g. it supports SRB mode, locked, disabled etc.) On that basis alone the PC falls marginally behind the SVC, at least for the cases where they are equivalently functional. After that, it goes to exactly the same code. There isn't a separate set of GET/FREE code for GETMAIN and STORAGE. Ergo, the pathlength for the same request will be marginally slower for STORAGE than GETMAIN. CC ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
