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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

On Thu, 2 Mar 2000, Burton Windle wrote:
>Date: Thu, 2 Mar 2000 21:00:54 -0500 (EST)
>From: Burton Windle <>
>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
> 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 <>
>To: Andrea Arcangeli <>
>Subject: 2.2.15pre9 and virtual memory
>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...)
> 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.


Comments are welcome.


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