Re: Re: 3525MB RAM Limit

[Sterling Windmill <sterling@ampx.net>]

Is this a problem in the latest (kvm-84) or just in an older version that Fedora 10 provides? 

----- Original Message ----- 
From: "Daniel Scott" <djscott@mit.edu> 
To: "Alex Williamson" <alex.williamson@hp.com> 
Cc: "Brian Jackson" <iggy@theiggy.com>, kvm@vger.kernel.org 
Sent: Thursday, April 9, 2009 2:54:11 PM GMT -05:00 US/Canada Eastern 
Subject: Re: [kvm] Re: 3525MB RAM Limit 

Brian, Alex, 

2009/4/9 Alex Williamson <alex.williamson@hp.com>: 
> On Thu, 2009-04-09 at 10:39 -0500, Brian Jackson wrote: 
>> some subjects to look for: 
>> * Can't boot guest with more than 3585MB when using large pages 
>> There was a patch from Marcelo that was supposed to fix it. 
>> * kvm-84 and guests with more than 3536 MB Ram? 
>> there were suggestions to make sure to use the correct bios and the OP stated 
>> that upgrading his kernel actually fixed the problem 
>> 
>> I could swear there was another one, but maybe I'm thinking of the IRC 
>> channel. If you are still unable to get it to work, you should reply back with 
>> more info. Kernel version, KVM version, etc. 
> 
> It could also be related to the guest trimming away memory due to the 
> way we used to report the MTRRs. This would show up in dmesg on the 
> guest. Try the latest kvm by hand and see if the problem goes away. 

Thanks for the suggestions. After more research, it looks like 
upgrading the software will fix the problem: 

http://www.func.nl/community/knowledgebase/running-kvm-guest-35-gb-ram 

We see the same BIOS message as in the above link. It seems like this 
will be fixed in Fedora 11 so we'll probably wait for a month or two 
and then upgrade Fedora on our host system. 

Thanks again, 

Dan 
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