Re: avail memory is short by 1G on my FreeBSD 6.0-STABLE MP Dell

Chad Leigh -- Shire.Net LLC schrieb:
> I assume you are talking about the "phenomenon"  of RAM "missing" due  
> to PCI and other I/O mapping into the 4GB address space?  What struck  
> me about the OP is that the amount of RAM "missing" is more than I  have 
> ever seen due to this.  My systems are usually 3.4-3.6GB of RAM  with 
> 4GB installed, not 2.86GB (3005MB)...  So are we sure that the  PCI 
> space mapping is the problem?

This is nothing unusual. I have a machine on which over 1.25GB is mapped "out 
of the way". It is a Tyan Thunder K8WE (S2895). In BIOS I can choose between 
Hardware/Software/Disabled mapping:


Hardware (requires E-stepping CPUs):
real memory  = 5637144576 (5376 MB)
Physical memory chunk(s):
0x0000000000001000 - 0x0000000000090fff, 589824 bytes (144 pages)
0x0000000000985000 - 0x00000000a616ffff, 2776543232 bytes (677867 pages)
0x0000000100000000 - 0x000000014ffdffff, 1342046208 bytes (327648 pages)
avail memory = 4109500416 (3919 MB)

Software (should work regardless of stepping):
real memory  = 6442450944 (6144 MB)
Physical memory chunk(s):
0x0000000000001000 - 0x0000000000090fff, 589824 bytes (144 pages)
0x0000000000985000 - 0x000000007ff1ffff, 2136584192 bytes (521627 pages)
0x0000000100000000 - 0x0000000174baffff, 1958412288 bytes (478128 pages)
avail memory = 4085907456 (3896 MB)

Disabled:
real memory  = 2951872512 (2815 MB)
Physical memory chunk(s):
0x0000000000001000 - 0x0000000000090fff, 589824 bytes (144 pages)
0x0000000000983000 - 0x00000000aac56fff, 2855092224 bytes (697044 pages)
avail memory = 2846003200 (2714 MB)



Daniel