>>I've just added 4MB to a DECstation 2100. The self test shows 16MB (the real physical amount). When the system boots (its a diskless client under ultrix 4.2) I see;
>>
>>real mem = 16777216
>>avail mem = 12529667
>>
>
> [ Where Tony explains the difference in "real" and "available" memory. ]
>
>16777216 - 12529667 = 4247549
>
>Which means that kernel is using just over 4 MB of memory.
>
It's also worth pointing out that a large part of that 4 MB
is probably the ULTRIX buffer cache. Unless you've changed
it, it is 10% of the physcial memory size. You can get the
base kernel size with size(1) run on /vmunix. Many of the
larger tapes used by the kernel are allocated dynamically
when the system boots. Look at the output of the pstat -T
command to see the number of entires in these tables.
