[Fedora-xen] Re: Fedora-xen Digest, Vol 23, Issue 15

Fierbaugh, Stephen stephen.fierbaugh at pbti.org
Mon Oct 22 16:41:03 UTC 2007 

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>    1. RE: 64-Bit RAM Detection >4GB? (Dustin Henning)
>    2. RE: 64-Bit RAM Detection >4GB? (Dustin Henning)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 19 Oct 2007 13:29:38 -0400
> From: "Dustin Henning" <Dustin.Henning at prd-inc.com>
> Subject: RE: [Fedora-xen] 64-Bit RAM Detection >4GB?
> To: <fedora-xen at redhat.com>
> Message-ID: <008301c81275$a02df860$e089e920$@Henning at prd-inc.com>
> Content-Type: text/plain;	charset="utf-8"
>
>   
>> -----Original Message-----
>> From: fedora-xen-bounces at redhat.com [mailto:fedora-xen-bounces at redhat.com] On Behalf Of Dale Bewley
>> Sent: Friday, October 19, 2007 11:46
>> To: fedora-xen
>> Subject: Re: [Fedora-xen] 64-Bit RAM Detection >4GB?
>>
>> I have 4 procs with 16G RAM and no mem paramters in grub at all, and it looks like this:
>>
>> Linux h 2.6.20-2931.fc7xen #1 SMP Mon Aug 13 10:11:56 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
>>
>> # grep 'model name' /proc/cpuinfo
>> model name      : AMD Opteron(tm) Processor 852
>> model name      : AMD Opteron(tm) Processor 852
>> model name      : AMD Opteron(tm) Processor 852
>> model name      : AMD Opteron(tm) Processor 852
>>
>> # grep Total /proc/meminfo
>> MemTotal:     13335552 kB
>> SwapTotal:     5261240 kB
>> VmallocTotal: 34359738367 kB
>>
>> # xm info |grep total
>> total_memory           : 16319
>>
>> I have 3 domU's running with each allocated 1G, so 16-3=13 which I suppose explains the MemTotal line above from the perspective of dom0.
>>
>>
>> On an identical server running RHEL with no xen and I see something a bit different:
>>
>> Red Hat Enterprise Linux AS release 4 (Nahant Update 5)
>> Linux z 2.6.9-55.0.2.ELsmp #1 SMP Tue Jun 12 17:58:20 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
>>
>> # grep Total /proc/meminfo
>> MemTotal:     16359284 kB
>> HighTotal:           0 kB
>> LowTotal:     16359284 kB
>> SwapTotal:     5261240 kB
>> VmallocTotal: 536870911 kB
>> HugePages_Total:     0
>>
>> Not sure if that was helpful.
>> --
>> Dale Bewley - Unix Administrator - Shields Library - UC Davis
>> GPG: 0xB098A0F3 0D5A 9AEB 43F4 F84C 7EFD  1753 064D 2583 B098 A0F3
>>     
>
> Dale,
> 	That could be very helpful, or it might just get someone to blame Intel.  Either way, thanks, now I at least know that it should work and I can try to determine why it isn't.  As for the MemTotal, you are correct on why it is 13 instead of 16.  However, if you shut down one of those domU's, the memory wouldn't necessarily be automatically re-assigned to dom0, and /proc/meminfo is based on what is assigned to dom0.  I think "xm info" would be the correct way to see the detected memory in the system once domU's are created or if dom0 isn't assigned all memory.  There may be other ways.  Thanks,
> 	Dustin
>
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 19 Oct 2007 13:34:34 -0400
> From: "Dustin Henning" <Dustin.Henning at prd-inc.com>
> Subject: RE: [Fedora-xen] 64-Bit RAM Detection >4GB?
> To: <fedora-xen at redhat.com>
> Message-ID: <008401c81276$509879f0$f1c96dd0$@Henning at prd-inc.com>
> Content-Type: text/plain;	charset="utf-8"
>
>   
>> -----Original Message-----
>> From: fedora-xen-bounces at redhat.com [mailto:fedora-xen-bounces at redhat.com] On Behalf Of Dale Bewley
>> Sent: Friday, October 19, 2007 11:46
>> To: fedora-xen
>> Subject: Re: [Fedora-xen] 64-Bit RAM Detection >4GB?
>>
>> I have 4 procs with 16G RAM and no mem paramters in grub at all, and it looks like this:
>>
>> Linux h 2.6.20-2931.fc7xen #1 SMP Mon Aug 13 10:11:56 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
>>
>> # grep 'model name' /proc/cpuinfo
>> model name      : AMD Opteron(tm) Processor 852
>> model name      : AMD Opteron(tm) Processor 852
>> model name      : AMD Opteron(tm) Processor 852
>> model name      : AMD Opteron(tm) Processor 852
>>
>> # grep Total /proc/meminfo
>> MemTotal:     13335552 kB
>> SwapTotal:     5261240 kB
>> VmallocTotal: 34359738367 kB
>>
>> # xm info |grep total
>> total_memory           : 16319
>>
>> I have 3 domU's running with each allocated 1G, so 16-3=13 which I suppose explains the MemTotal line above from the perspective of dom0.
>>
>>
>> On an identical server running RHEL with no xen and I see something a bit different:
>>
>> Red Hat Enterprise Linux AS release 4 (Nahant Update 5)
>> Linux z 2.6.9-55.0.2.ELsmp #1 SMP Tue Jun 12 17:58:20 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
>>
>> # grep Total /proc/meminfo
>> MemTotal:     16359284 kB
>> HighTotal:           0 kB
>> LowTotal:     16359284 kB
>> SwapTotal:     5261240 kB
>> VmallocTotal: 536870911 kB
>> HugePages_Total:     0
>>
>> Not sure if that was helpful.
>> --
>> Dale Bewley - Unix Administrator - Shields Library - UC Davis
>> GPG: 0xB098A0F3 0D5A 9AEB 43F4 F84C 7EFD  1753 064D 2583 B098 A0F3
>>     
>
> Dale,
> 	Could you tell me if you passed any arguments to the installer during your initial install?  Also, can you show me the appropriate portion of your grub.conf?  I would like to see if maybe it is different than mine even though they are both pre-packaged installs.  I had a machine with 2.6.20-2931.fc7xen, so I copied that to the machine in question, and it also only shows 3.1GiB for me.  I compared the config files for that kernel and the one I was using, and they are identical (minus version and date comment lines), so that was as I expected, but it makes it less likely that my problem is a version problem and more likely that something else is haywire.  Thanks,
> 	Dustin
>
>
>
>
>
> ------------------------------
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>
> End of Fedora-xen Digest, Vol 23, Issue 15
> ******************************************
>   


-- 
Sincerely Yours,
Stephen P. Fierbaugh <stephen at fierbaugh.org>
Pioneer Bible Translators <stephen.fierbaugh at pbti.org>
Pronounced: "Fire" as in hot, "Bah" as in humbug!

Jesus wept.  John 11:35 NIV

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