Anne & Lynn Wheeler wrote:
Brian Inglis <[EMAIL PROTECTED]> writes:
-- snip snip
concurrent with VAMPS effort was "ECPS" for 370 138&148. ECPS did some more stuff like VMA on the 158 (direct supervisor state instruction execution) ... but it also identified parts of the hypervisor kernel and moved that kernel code into microcode. the issue on 138&148 machines was that there was an avg. of 10:1 microcode instructions executed for every 370 instruction. Much of the kernel code moved to microcode on straigh 1:1 basis resulting in ten times performance speed up. old posting identifying specific kernel code segments for migrating into microcode. http://www.garlic.com/~lynn/94.html#21 370 ECPS VM microcode assist
-- snip snip Lynn: Can you point us to any information on 138/148 microprogramming and microarchitecture? Examples of the 10:1 microcode to 370 instruction expansion would be fascinating. JKA -- Smart is thinking you are right. Wise is knowing you might be wrong.
