Messages in this thread | | | Date | Sat, 21 Oct 2000 17:50:47 +1000 | From | Cefiar <> | Subject | Re: about /proc/meminfo and mmap |
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At 08:24 PM 20/10/00 -0400, Zhixu Liu wrote: >My PC have 128M RAM, but in /proc/meminfo, it display 122424K, not >128*1024K = 131072K, what does this mean?
Sounds like something is stealing your ram.
Usual suspects are..
Shadow RAM is enabled. - This steals a TINY (usually 64k for BIOS, and 32k each for each extra memory address enabled) of ram. Nothing major though.
Local memory accessing devices. - Embedded video cards (and possibly embedded sound devices) on boards using the Intel 815E chipset (and others) use local RAM for memory, instead of their own special memory - to reduce cost. Apart from weird memory sizes, this also can lead to latency and slow-down issues when accessing the memory normally. Many of these machines have AGP slots, and almost always have a PCI slot, so throwing in a cheap video (audio?) card can remove such issues, and frees up that memory again. Maximum I've seen a board allow for local video ram is 8 Meg, which is pretty much the amount you are missing. The board in question was a Socket 7 board with embedded video.
-- -=[ Stuart Young (Aka Cefiar) ]=------------------------------- | http://amarok.glasswings.com.au/ | cefiar1@optushome.com.au | ---------------------------------------------------------------
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