Virtual memory - really System V vs. bsd4.X

[buck%nrl-css at sri-unix.UUCP]

From:  Joe Buck <buck at nrl-css>


Mr. Wood says that paging is only one way of implementing
virtual memory (so paging != virtual memory). Maybe so. But the
question came up originally in the context of a comparison between
bsd4.X and System V on VAXes, and it appears to me that he is
attempting to defend the system V scheme. By currently accepted
definitions, however, the swapping system implemented by BTL for
System V on VAXes is NOT virtual memory, but this is a matter of
semantics. The central point is that the System V memory management
scheme is inferior and wastes one of the best features of the VAX,
which is why most VAX sites will continue to use bsd, despite
other problems with Berkeley.