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Re: [Xen-users] Xen 3 not seeing the right amount of RAM on x86_64

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Xen 3 not seeing the right amount of RAM on x86_64
From: "Chuck McIntyre" <chuck.mcintyre@xxxxxxxxx>
Date: Tue, 4 Dec 2007 13:09:05 -0800
Delivery-date: Tue, 04 Dec 2007 13:09:48 -0800
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I just confirmed, all my issues with both RAM and time (which I hadn't
even gotten around to posting yet) seem to have been resolved by the
latest Xen (3.1.2).

On Dec 3, 2007 10:15 AM, Chuck McIntyre <chuck.mcintyre@xxxxxxxxx> wrote:
> Hi folks,
> Just a quick update to this issue, which seems to be resolved (will
> send out more information once we've tried the solution on other
> systems as well). Originally we were running the following Xen
> version:
> xen-3.0.3-25.0.4.el5
> xen-libs-3.0.3-25.0.4.el5
> xen-libs-3.0.3-25.0.4.el5
> kernel-xen-2.6.18-8.1.15.el5.centos.plus
> But were unable to see the correct RAM within Xen (3.5GB on a 4GB
> system, for example) on 64bit CentOS linux with hardware
> virtualization via the AMD Opteron 2200 chipset.
> It was suggested that we try patching grub or upgrading to grub2,
> since Xen appears to get its memory information from grub, it was also
> suggested we try running the latest Xen.
> As a first step we grabbed xen 3.1.2-pre and applied it to one of the
> 4GB systems. Suddenly everything worked!
> [root@bouncingbetty ~]# uname -a
> Linux bouncingbetty.mydomain 2.6.18-xen #1 SMP Fri Nov 30 17:48:44 PST
> 2007 x86_64 x86_64 x86_64 GNU/Linux
> [root@bouncingbetty ~]# xm info | grep -i total_memory
> total_memory           : 4095
> From xm top:
> Mem: 4193844k total, 4190068k used, 3776k free    CPUs: 4 @ 2200MHz
> We are going to try to apply this to one of our 8GB systems today, to
> see if this fixes systems across the board.
> As an added bonus, this seems to have also fixed the time/ntp issues
> we were having in hardware virtualized linux.

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