Re: ESQA allocation question
- From: eamacneil@xxxxxxxx (Ted MacNEIL)
- Date: 28 Mar 2008 10:48:25 -0700
Given that ESQA will just overflow into ECSA is there any real reason not to allocate ESQA fairly low so that it is always at 100%, and then size/monitor ECSA for the combined requirements? I am aware that thatwould not be a good thing below the line, but I haven't read of any clear reason to 'tune' ESQA rather than ESQA/ECSA as a combined area.
I have always been of the opinion that a little SQA/ESQA conversion is okay, but not a lot.
IBM (I believe) used recommend as little as possible.
But, now with 64-bit addressing, and no expanded storage I think you cannot get away with it.
IIRC, IPL-processing needs more ESQA to build page tables, and that will not be allowed to overflow into CSA, since the entire system is not up yet.
There's a paper on the WTC site explaining this.
And, as my faded memory recalls, it might have been written by Kathy Welsh/Walsh (?).
-
Too busy driving to stop for gas!
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