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Subject: Re: [PATCH] VM strict overcommit
From: Robert Love <rml@tech9.net>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: akpm@zip.com.au, Linus Torvalds <torvalds@transmeta.com>,
       riel@conectiva.com.br, linux-kernel@vger.kernel.org
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On Sat, 2002-07-20 at 17:32, Alan Cox wrote:

> Your 95% mode is pure crap. I tried various values and I can assure you
> that your code will fail dismally to do anything useful unless you are
> below 65% when running Oracle for example.

Relax Alan.  Nothing is set in stone and we need to pick some number to
start playing with.

My test suite was _not_ Oracle (and who would run Oracle on a swapless
machine?) and I was not able to OOM the machine with my tests.  I in no
way contend 95% is perfect.  Even your 50% mode is not (nothing but
solely backing store can make any guarantees).

But "works for me" is a start and we can work on tuning it.  No
"swapless" mode will be perfect and while 65% may work for, another load
with gross overhead may need more room.

I sent you an email and told you I was doing this and asked your opinion
on a percentage.  Why are you picking on me now?

	Robert Love

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