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    SubjectRe: Memory management in Kernel 2.4.x
    On Mon, May 27, 2002 at 03:45:55PM +0200, Peter Wächtler wrote:
    > Andreas Hartmann wrote:
    > >Zwane Mwaikambo wrote:
    > >
    > >
    > >>On Mon, 27 May 2002, Andreas Hartmann wrote:
    > >>
    > >>
    > >>>rsync allocates all of the memory the machine has (256 MB RAM, 128 MB
    > >>>swap). When this occures, processes get killed like described in the
    > >>>posting before. The machine doesn't respond as long as the rsync -
    > >>>process isn't killed, because it fetches all the memory which gets free
    > >>>after a process has been killed.
    > >>>
    > >>And the rsync process never gets singled out? nice!
    > >>
    > >
    > >Until it's killed by the kernel (if overcommitment isn't deactivated). If
    > >overcommitment is deactivated, the services of the machine are dead
    > >forever. There will be nothing, which kills such a process. Or am I wrong?
    > >
    >
    > There is still the oom killer (Out Of Memory).
    > But it doesn't trigger and the machine pages "forever".
    > Usually kswapd eats the CPU then, discarding and reloading pages,
    > searching lists for pages to evict and so on.

    can you reproduce with 2.4.19pre9aa2? I expect at least the deadlock
    (if it's a deadlock and not a livelock) should go away.

    Also I read in another email that somebody grown the per-socket buffer
    to hundred mbytes, if you do that on a 32bit arch with highmem you'll
    run into troubles, too much ZONE_NORMAL ram will be constantly pinned
    for the tcp pipeline and the machine can enter livelocks.

    Andrea
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