linux-kernel - Re: Finding lost memory + kernel messages explained

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Message-ID: <87y6ua86f4.fsf@basil.nowhere.org>
Date:	Thu, 09 Apr 2009 12:31:27 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Imre Gergely <gimre@...ancs.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Finding lost memory + kernel messages explained

Imre Gergely <gimre@...ancs.net> writes:
>
> That would be around 3896MB. My question is: where does the memory go?
> Is it normal to 'lose' that much (~130MB) ?

I wrote a paper about this topic some time ago.

http://halobates.de/memory.pdf
http://halobates.de/memorywaste.pdf

> One thing I tried was appending iommu=off at boot, which gave me back

That means if you have any devices that cannot addresses > 32bit they
will panic with that setting.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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