I've recently upgraded a system to 384 MB of memory,
which the system detects during boot. Dmesg reports
real memory = 402587648 (393152K bytes)
avail memory = 387903488 (378812K bytes)
with or without 'options MAXMEM "(384*1024)"' and
"sysctl -a | grep hw" reports
hw.physmem: 399212544
hw.usermem: 368316416
hw.pagesize: 4096
hw.availpages: 97298
However, if I fire up top(1), she reports
Mem: 5390K Active, 5322K Inact, 7627K Wired, 13K Cache, 48M Buf, 76M Free
Simply addition of the numbers from top(1) comes to about 141 MB.
Looking at top(1) sourcesi shows that she uses the following
syctl variables:
vm.stats.vm.v_active_count: 5169
vm.stats.vm.v_inactive_count: 5116
vm.stats.vm.v_wire_count: 7550
vm.stats.vm.v_cache_count: 24
vm.stats.vm.v_free_count: 77901
and the total page_count is
vm.stats.vm.v_page_count: 95760
which nearly agrees with hw.availpages.
It appears that the recent changes to top(1) to use sysctl
may have gotten the page size, but I haven't determined
where to fix her.
So, is the system using all 384 MB of memory or is there
another kernel config option to set besides MAXMEM.
--
Steve
http://troutmask.apl.washington.edu/~kargl/
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