linux-kernel - Re: Odd swapping issue

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Message-ID: <4887E700.6060602@isomerica.net>
Date:	Wed, 23 Jul 2008 22:20:48 -0400
From:	Dan Noé <dpn@...merica.net>
To:	David Newall <davidn@...idnewall.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Rafal Wijata <devnull@...ata.com>, linux-kernel@...r.kernel.org
Subject: Re: Odd swapping issue

David Newall wrote:
> Peter Zijlstra wrote:
>> 16g ram on a 32bit kernel is stretching it... may I suggest running a
>> 64bit kernel?
>>   
> 
> Is it?  Do we expect that behaviour with so much RAM?

The memory must be mapped into the 4GB (32-bit) virtual address space to
be used.  Having this much memory on a system with 32 bit pointers leads
to a lot of VM overhead and strange behavior.

Cheers,
Dan

-- 
                    /--------------- - -  -  -   -   -
                    |  Dan Noé
                    |  http://isomerica.net/~dpn/
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