Berkeley CSUA MOTD:Entry 52565
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2017/10/19 [General] UID:1000 Activity:popular
10/19   

2009/2/13-18 [Computer/HW/Memory, Computer/Domains] UID:52565 Activity:nil
2/13    Question about memory relocation:
        These days most h/w has a relocation register. Could the relocation
        address be stored on disk or in kernel memory vs. in a register? Yes,
        that would be slow but is it possible? Do you *need* a relocation
        register or does it exist purely for performance reasons? I was
        reading some paper written by IBM in the 1960s that seemed to
        imply the former and I don't understand why that would be.
        \_ What "relocation register" is this?  If you're talking about the
           one that (say) the IBM 7090 used for time-sharing, that's been
           obsolete for 30 years; modern machines use virtual memory.  (And
           the tables defining the virtual-memory mapping are in fact stored
           in kernel memory, since they're too big to fit in a register.)
           Or did you have something else in mind?
           \_ Yes, but modern machines still have a base register. Do
              they need it?
              \_ What do you mean by a "base register"?  It would help if you
                 could say exactly which register you're talking about on some
                 real architecture (x86, PowerPC, MIPS, etc.), or at least if
                 you could describe what this register does.
        \_ Because comparing 1960s computer hardware to today's is like asking
           why drivers need a whip to make their cars drive faster because
           you saw a picture of a horse drawn carriage.
           \_ Well, no. Modern hardware still does it that way. The
              question is: Does it *have* to?
2017/10/19 [General] UID:1000 Activity:popular
10/19   

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2012/2/5-3/26 [Computer/SW/WWW/Browsers] UID:54300 Activity:nil
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2011/6/5-8/27 [Computer/HW/Memory] UID:54127 Activity:nil
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2011/3/26-4/20 [Computer/HW/Memory] UID:54062 Activity:nil
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2010/6/4-30 [Computer/SW/Languages/C_Cplusplus] UID:53849 Activity:nil
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2009/5/6 [Computer/HW/CPU] UID:52952 Activity:moderate
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