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    SubjectMemory + page tables

    SMP 2.1.109 with mem=8M (during slow compile of kernel)

    Free pages: 584kB
    ( Free: 146 (48 96 144)
    18*4kB 14*8kB 5*16kB 2*32kB 0*64kB 2*128kB = 584kB)
    Swap cache: add 57461/57461, delete 57276/57276, find 0/0
    Free swap: 24380kB
    2048 pages of RAM
    351 reserved pages
    241 pages shared
    185 pages swap cached
    28 pages in page table cache
    Buffer memory: 244kB
    Buffer heads: 281
    Buffer blocks: 244
    CLEAN: 193 buffers, 0 used (last=0), 0 locked, 0 protected, 0 dirty
    LOCKED: 47 buffers, 21 used (last=43), 0 locked, 0 protected, 0 dirty
    DIRTY: 2 buffers, 0 used (last=0), 0 locked, 0 protected, 2 dirty
    Networking buffers in use : 16
    Total network buffer allocations : 1530
    Total failed network buffer allocs : 0
    IP fragment buffer size : 0

    1:43pm up 28 min, 5 users, load average: 5.11, 5.43, 4.19
    52 processes: 48 sleeping, 4 running, 0 zombie, 0 stopped
    CPU states: 108.3% user, 4.1% system, 107.7% nice, 0.0% idle
    Mem: 6788K av, 6216K used, 572K free, 1784K shrd, 244K buff
    Swap: 33228K av, 8868K used, 24360K free 2024K cached

    Pages table cache takes up 114,688 bytes, quite a bit. Lots of free memory
    and cache and the disk light is still on solid from swapping. 8MB actually
    booted, 4MB wouldn't boot normally (it finished all rc.d scripts but never
    actually gave a log in prompt) but worked with init=/bin/bash. Actually,
    it's somewhat usable...

    A bit later:

    Mem-info:
    Free pages: 552kB
    ( Free: 138 (48 96 144)
    16*4kB 13*8kB 2*16kB 3*32kB 0*64kB 2*128kB = 552kB)
    Swap cache: add 74299/74299, delete 74178/74178, find 0/0
    Free swap: 23988kB
    2048 pages of RAM
    351 reserved pages
    331 pages shared
    121 pages swap cached
    20 pages in page table cache
    Buffer memory: 244kB
    Buffer heads: 282
    Buffer blocks: 244
    CLEAN: 165 buffers, 0 used (last=0), 0 locked, 0 protected, 0 dirty
    LOCKED: 45 buffers, 21 used (last=36), 0 locked, 0 protected, 0 dirty
    DIRTY: 1 buffers, 0 used (last=0), 0 locked, 0 protected, 1 dirty
    Networking buffers in use : 16
    Total network buffer allocations : 5317
    Total failed network buffer allocs : 0
    IP fragment buffer size : 0

    Think I'll go try 5, 6, 7 MB and see if they boot.

    -George


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