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    SubjectRe: Linux 2.2.15pre12 [VM fixes]
    Alan, the 2.2.15pre12 VM is not working correctly. I just complained about
    that changes a few weeks ago and here are the first two bug reports
    (different):

    On Thu, 2 Mar 2000, Burton Windle wrote:
    >
    >Date: Thu, 2 Mar 2000 21:00:54 -0500 (EST)
    >From: Burton Windle <bwindle@atlantic.net>
    >To: alan@lxorguk.ukuu.org.uk
    >Cc: andrea@suse.de
    >Subject: 2.2.15pre12: OOM comments
    >
    >Is the OOM killing turned off by default on 2.2.15pre12? I had just
    >booted into it, and the first thing I did (besides noticed how
    ><linux/version.h> was wrong) was to telnet in as a normal user, and use
    >all the RAM I could (perl -e '@a=(a..zzzzzzzzzzz').
    >
    >I logged in as root on the console, and watched top. after a few seconds,
    >my 64 RAM dwindled to 1047k free, and my 40 meg swap dropped to 0kfree.
    >However, the OOM-killer never appeared, and the ram-hungry perl kept on
    >living. I had to alt+sysrq+k (which, btw, killed init ).
    >
    >Wouldn't one process using all the ram+swap be an ideal target for an
    >OOM-Killer to kill?
    >
    >ps. while the machine stood there memory-less, I noticed that if I pinged
    >it from a Win98 box with packets larger than 1474 bytes, it wouldn't
    >repond; they had to be smaller than that.
    >
    >Intel P233mmx, 64 RAM, 40 swap, 2.2.15pre12, Slackware4, RealTek 8029 eth0
    >
    >Thanks,
    > Burton Windle
    >
    >
    >
    >
    >

    On Fri, 25 Feb 2000, Arjan van de Ven wrote:
    >
    >Date: Fri, 25 Feb 2000 18:43:32 +0100 (CET)
    >From: Arjan van de Ven <arjan@fenrus.demon.nl>
    >To: Andrea Arcangeli <andrea@suse.de>
    >Subject: 2.2.15pre9 and virtual memory
    >
    >Hi,
    >
    >I am running tests on a SMP system with kernel 2.2.15pre9, and I see
    >some behavior I cannot explain. My machine has 96 Mb ram and 128 Mb
    >swapspace, and the systemload is something like
    >
    >while (1) {
    > make mrproper
    > make randomconfig
    > make dep
    > make bzImage
    >}
    >
    >Once in a while (about every 4 hours or so), the gcc in the "make bzImage"
    >aborts with the message "Out of virtual memory".
    >
    >Can this be caused by bad hardware, or is this a bug/problem with the
    >memory-management in the kernel?
    >(I can imagine that there are too many dirty pages, and the swap-IO to
    >disk isn't fast enough, so no memory is available immediately. This would
    >be an undiserable situation though...)
    >
    >Greetings,
    > Arjan van de Ven
    >
    >
    >

    Arjan just told me 2.2.14aa* is rock solid in the same conditions.

    These are the VM changes that I propose for the official 2.2.15. They are
    against 2.2.15pre12.

    ftp://ftp.*.kernel.org/pub/linux/kernel/people/andrea/proposed/v2.2/2.2.15pre12/VM-1.gz

    Comments are welcome.

    Thanks.
    Andrea


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