Message-ID: <4887E700.6060602@isomerica.net>
Date: Wed, 23 Jul 2008 22:20:48 -0400
From: =?ISO-8859-1?Q?Dan_No=E9?= <dpn@isomerica.net>
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To: David Newall <davidn@davidnewall.com>
CC: Peter Zijlstra <peterz@infradead.org>, Rafal Wijata <devnull@wijata.com>,
       linux-kernel@vger.kernel.org
Subject: Re: Odd swapping issue
References: <488761F0.4040906@wijata.com> <1216835428.7257.194.camel@twins> <4887A000.30605@davidnewall.com>
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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 No?
                    |  http://isomerica.net/~dpn/
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