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

[Sadique Puthen <sputhenp@xxxxxxxxxx>]

Daniel Mealha Cabrita wrote:
> It looks like you're using a 32-bit Xen kernel without compiled PAE support.
>   
I don't think so from the output of "uname -a".  But it looks strange.

--Sadique
> Also looks like your non-Xen kernel is a 32-bit one with PAE support.
>
> Em Qua 28 Nov 2007 02:47, Chuck McIntyre escreveu:
>   
> > Hi,
> >
> > I am having a problem where Xen is not seeing the appropriate amount
> > of memory allocated. At first I thought this was similar to previously
> > described issues with the BIOS remapped hole for PCI devices (such as
> > in a post here
> > http://lists.xensource.com/archives/html/xen-users/2005-07/msg00177.html),
> > however, we only see about 3.5GB (see below) of RAM regardless of
> > whether we have a system with 4GB of RAM or 8GB of RAM (as seen by the
> > BIOS). Regardless, when we boot into the non-xen kernel available on
> > the same box, the OS then sees all the available RAM.
> >
> > I have tried to provide as much relevant information as I could
> > without being spammy. Please let me know if I need to provide
> > additional details. I would appreciate any help here, as this one has
> > us stumped, or do we have a bug with our hardware version?
> >
> > __4GB system___
> >
> > [me@molotov ~]$ uname -a
> > Linux molotov.mydomain 2.6.18-8.1.15.el5.centos.plusxen #1 SMP Thu Oct
> > 25 07:21:34 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
> > [me@molotov ~]$ rpm -qa | grep xen
> > 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
> > [me@molotov ~]$ grep MemTotal /proc/meminfo
> > MemTotal:      3428400 kB
> > top gives me:
> > Mem:   3428400k total,   422916k used,  3005484k free,    21648k buffers
> > [root@molotov ~]# xm info 2>&1 | grep memory
> > total_memory           : 3535
> > free_memory            : 129
> > xentop gives me:
> > Mem: 3620404k total, 3488052k used, 132352k free    CPUs: 4 @ 2200MHz
> > dmesg
> > BIOS-provided physical RAM map:
> >  Xen: 0000000000000000 - 00000000d1d4c000 (usable)
> > On node 0 totalpages: 859468
> >   DMA zone: 859468 pages, LIFO batch:31
> > DMI present.
> >
> > -=After reboot=-
> >
> > BIOS gives me:
> > Initializing USB Controllers .. Done.
> > 4096MB OK
> > [me@molotov ~]$ grep MemTotal /proc/meminfo
> > MemTotal:      4050520 kB
> > top gives
> > Mem:   4050520k total,   264668k used,  3785852k free,    20612k buffers
> > dmesg
> > BIOS-provided physical RAM map:
> >  BIOS-e820: 0000000000000000 - 000000000009dc00 (usable)
> >  BIOS-e820: 000000000009dc00 - 00000000000a0000 (reserved)
> >  BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
> >  BIOS-e820: 0000000000100000 - 00000000dcff0000 (usable)
> >  BIOS-e820: 00000000dcff0000 - 00000000dcffe000 (ACPI data)
> >  BIOS-e820: 00000000dcffe000 - 00000000dd000000 (ACPI NVS)
> >  BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
> >  BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
> >  BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
> >  BIOS-e820: 00000000ff700000 - 0000000100000000 (reserved)
> >  BIOS-e820: 0000000100000000 - 0000000123000000 (usable)
> > DMI present.
> > Bootmem setup node 0 0000000000000000-0000000080000000
> > Bootmem setup node 1 0000000080000000-0000000123000000
> > On node 0 totalpages: 515808
> >   DMA zone: 2728 pages, LIFO batch:0
> >   DMA32 zone: 513080 pages, LIFO batch:31
> > On node 1 totalpages: 515144
> >   DMA32 zone: 373744 pages, LIFO batch:31
> >   Normal zone: 141400 pages, LIFO batch:31
> >
> >
> >
> > __ 8GB System __
> >
> > [me@molotov ~]$ uname -a
> > Linux benelli.mydomain 2.6.18-8.1.15.el5.centos.plusxen #1 SMP Thu Oct
> > 25 07:21:34 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
> > [me@molotov ~]$ rpm -qa |  grep xen
> > kernel-xen-2.6.18-8.1.15.el5.centos.plus
> > xen-libs-3.0.3-25.0.4.el5
> > xen-libs-3.0.3-25.0.4.el5
> > xen-3.0.3-25.0.4.el5
> > [me@benelli ~]$ grep MemTotal /proc/meminfo
> > MemTotal:      3428336 kB
> > top gives me:
> > Mem:   3428336k total,   437888k used,  2990448k free,    16580k buffers
> > [root@benelli ~]# xm info 2>&1| grep memory
> > total_memory           : 3535
> > free_memory            : 0
> > xentop gives me:
> > Mem: 3620336k total, 3620064k used, 272k free    CPUs: 4 @ 2200MHz
> > dmesg
> > BIOS-provided physical RAM map:
> >  Xen: 0000000000000000 - 00000000d1d3c000 (usable)
> > DMI present.
> >
> > -=After Reboot=-
> >
> > BIOS gives me:
> > Initializing USB Controllers .. Done.
> > 8192MB OK
> >
> > After reboot into non-xen kernel:
> >
> > [root@benelli ~]# grep MemTotal /proc/meminfo
> > MemTotal:      8181124 kB
> > Top gives
> > Mem:   8181124k total,   284732k used,  7896392k free,    16944k buffers
> > dmesg
> > BIOS-provided physical RAM map:
> >  BIOS-e820: 0000000000000000 - 000000000009c400 (usable)
> >  BIOS-e820: 000000000009c400 - 00000000000a0000 (reserved)
> >  BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
> >  BIOS-e820: 0000000000100000 - 00000000dcfe0000 (usable)
> >  BIOS-e820: 00000000dcfe0000 - 00000000dcfee000 (ACPI data)
> >  BIOS-e820: 00000000dcfee000 - 00000000dcff0000 (ACPI NVS)
> >  BIOS-e820: 00000000dcff0000 - 00000000dcffe000 (reserved)
> >  BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
> >  BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
> >  BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
> >  BIOS-e820: 00000000ff700000 - 0000000100000000 (reserved)
> >  BIOS-e820: 0000000100000000 - 0000000223000000 (usable)
> > DMI present.
> > Bootmem setup node 0 0000000000000000-0000000123000000
> > Bootmem setup node 1 0000000123000000-0000000223000000
> > On node 0 totalpages: 1030931
> >   DMA zone: 2723 pages, LIFO batch:0
> >   DMA32 zone: 886808 pages, LIFO batch:31
> >   Normal zone: 141400 pages, LIFO batch:31
> > On node 1 totalpages: 1034240
> >   Normal zone: 1034240 pages, LIFO batch:31
> >
> >
> > __Both Systems__
> >
> > Here is grub.conf (equivalent on both systems):
> > default=0
> > timeout=5
> > serial --unit=0 --speed=9600
> > terminal --timeout=5 serial console
> > title CentOS (2.6.18-8.1.15.el5.centos.plusxen)
> >         root (hd0,0)
> >         kernel /boot/xen.gz-2.6.18-8.1.15.el5.centos.plus console=vga
> >         module /boot/vmlinuz-2.6.18-8.1.15.el5.centos.plusxen ro
> > root=/dev/md0 console=ttyS0 console=ttyS0,9600n8 console=tty0
> > xencons=tty
> >         module /boot/initrd-2.6.18-8.1.15.el5.centos.plusxen.img
> > title CentOS (2.6.18-8.1.15.el5.centos.plus)
> >         root (hd0,0)
> >         kernel /boot/vmlinuz-2.6.18-8.1.15.el5.centos.plus ro
> > root=/dev/md0 console=ttyS0 console=ttyS0,9600n8 console=tty0
> > xencons=tty
> >         initrd /boot/initrd-2.6.18-8.1.15.el5.centos.plus.img
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >     
>   
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