[CentOS] Gathering information about RAM in sockets

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Hi list,

I have an IBM xseries 345, running CentOS 5.3, hosting a few Xen domUs.

However, I need more RAM -- but cannot remember if all (four) RAM
sockets are populated (which would mean to buy higher capacity modules)
or if there are two slots left to use.

However, I'd like (and think that it's possible, but don't remember how)
to check remotely.

dmesg's first lines:

Linux version 2.6.18-164.el5xen (mockbuild at builder16.centos.org) (gcc
version 4.1.2 20080704 (Red Hat 4.1.2-46)) #1 SMP Thu Sep 3 04:47:32 EDT
2009
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 0000000020800000 (usable)
0MB HIGHMEM available.
520MB LOWMEM available.
Using x86 segment limits to approximate NX protection
On node 0 totalpages: 133120
  DMA zone: 133120 pages, LIFO batch:31
DMI 2.3 present.
ACPI: RSDP (v000 IBM                                   ) @ 0x000fdfc0
ACPI: RSDT (v001 IBM    SERONYXP 0x00001000 IBM  0x45444f43) @ 0x7ffdff80
ACPI: FADT (v001 IBM    SERONYXP 0x00001000 IBM  0x45444f43) @ 0x7ffdff00
ACPI: MADT (v001 IBM    SERONYXP 0x00001000 IBM  0x45444f43) @ 0x7ffdfe40
ACPI: ASF! (v016 IBM    SERONYXP 0x00000001 IBM  0x45444f43) @ 0x7ffdfd80
ACPI: DSDT (v001 IBM    SERGEODE 0x00001000 MSFT 0x0100000b) @ 0x00000000
ACPI: Local APIC address 0xfee00000
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x06] enabled)
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x07] enabled)
ACPI: LAPIC_NMI (acpi_id[0x00] dfl dfl lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x06] dfl dfl lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x07] dfl dfl lint[0x1])
ACPI: IOAPIC (id[0x0e] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 14, version 17, address 0xfec00000, GSI 0-15
ACPI: IOAPIC (id[0x0d] address[0xfec01000] gsi_base[16])
IOAPIC[1]: apic_id 13, version 17, address 0xfec01000, GSI 16-31
ACPI: IOAPIC (id[0x0c] address[0xfec02000] gsi_base[32])
IOAPIC[2]: apic_id 12, version 17, address 0xfec02000, GSI 32-47
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: IRQ0 used by override.
ACPI: IRQ2 used by override.
ACPI: IRQ5 used by override.
Enabling APIC mode:  Flat.  Using 3 I/O APICs
Using ACPI (MADT) for SMP configuration information
Built 1 zonelists.  Total pages: 133120
Kernel command line: ro root=/dev/VG00/VG_root
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
CPU 0 irqstacks, hard=c0750000 soft=c0730000
PID hash table entries: 4096 (order: 12, 16384 bytes)
Xen reported: 3059.962 MHz processor.
Console: colour VGA+ 80x25
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Software IO TLB enabled:
 Aperture:     2 megabytes

(...)

Any hints?

Thanks in advance,

Timo

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