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Date: Tue, 3 Jun 2008 15:43:51 +0100
From: RW <fbsd06@mlists.homeunix.com>
To: freebsd-questions@freebsd.org
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In-Reply-To: <E1K3Qz3-000OTE-00.the-ghost-inbox-ru@f107.mail.ru>
References: <E1K3Qz3-000OTE-00.the-ghost-inbox-ru@f107.mail.ru>
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Cc: The Ghost <the-ghost@inbox.ru>
Subject: Re: very strange reaction of the md disks
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On Tue, 03 Jun 2008 11:31:05 +0400
The Ghost <the-ghost@inbox.ru> wrote:

> Hello,
> 
> Maybe I just don't understand something, but anyway, it looks really
> odd.
> 
> I have a machine with 2 Gb RAM with a clean newly-installed
> FREEBSD-7.0-RELEASE. I make two 300-MB mdconfig disks and populate
> them, and when the first one was already full and the second one is
> only half-full, I get a kernel panic "not enough memory". I wonder
> where did 1,5 Gb go?? 

Try using swap-backed md devices instead. With both malloc and swap
devices the data is stored in ram and paged-out to swap as needed, but
it helps with some of the malloc limitations.

I'm using a 2.7GB /tmp directory with 1.6GB of ram and have not had any
problems. I don't actually see any swap usage unless I put a lot of
data on the device, otherwise I can even do a swapoff.