Messages in this thread | | | From | Paolo Ornati <> | Subject | Re: Lost memory, total memory size is not correct | Date | Mon, 19 Jan 2004 18:58:05 +0100 |
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On Monday 19 January 2004 12:22, Jürgen Urban wrote: > Hello, > > I tried to get the amount of total physical memory. I looked at > /proc/meminfo and found this line (2.4.18): > > MemTotal: 30844 kB > > But this is not correct the system have 32768 kB Memory. I looked at > kernel sources and I found the variable max_mapnr. Can I use it to detect > the correct memory size? It seems that it stores the maximum number of > pages usable. So I can convert it with macro K() in > linux/fs/proc/proc_misc.c to a value in kB.
There are some addresses that cannot be used on PC because there is something mapped (for example System ROM...), you can see these regions doing "cat /proc/iomem".
Here there is my output:
00000000-0009fbff : System RAM 0009fc00-0009ffff : reserved 000a0000-000bffff : Video RAM area 000c0000-000c7fff : Video ROM 000f0000-000fffff : System ROM 00100000-07febfff : System RAM 00100000-00298596 : Kernel code 00298597-00322f27 : Kernel data 07fec000-07feefff : ACPI Tables 07fef000-07ffefff : reserved 07fff000-07ffffff : ACPI Non-volatile Storage de800000-de81ffff : Promise Technology, Inc. 20265 df000000-df0000ff : Cologne Chip Designs GmbH ISDN network controller [HFC-PCI] df800000-df8000ff : Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ df800000-df8000ff : 8139too e0000000-e3dfffff : PCI Bus #01 e0000000-e1ffffff : 3Dfx Interactive, Inc. Voodoo Banshee e3f00000-e5ffffff : PCI Bus #01 e4000000-e5ffffff : 3Dfx Interactive, Inc. Voodoo Banshee e6000000-e7ffffff : VIA Technologies, Inc. VT8363/8365 [KT133/KM133] ffff0000-ffffffff : reserved
Bye
-- Paolo Ornati Linux v2.4.24
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