[CentOS] Not seeing all memory in CentOS 5.1 x86_64

Ruslan Sivak russ at vshift.com
Wed Jun 11 01:00:08 UTC 2008

John R Pierce wrote:
> whats cat /proc/meminfo   say?
# cat /proc/meminfo
MemTotal:      6104064 kB
MemFree:       1992580 kB
Buffers:       2060812 kB
Cached:        1515056 kB
SwapCached:          0 kB
Active:        1913988 kB
Inactive:      1793012 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      6104064 kB
LowFree:       1992580 kB
SwapTotal:     2031608 kB
SwapFree:      2031608 kB
Dirty:             100 kB
Writeback:           0 kB
AnonPages:      131120 kB
Mapped:          13216 kB
Slab:           137600 kB
PageTables:       9004 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:   5083640 kB
Committed_AS:   354988 kB
VmallocTotal: 34359738367 kB
VmallocUsed:      3196 kB
VmallocChunk: 34359734335 kB

> what do you see at the top of `dmesg` relating to memory (first 100 or 
> so lines).
Bootdata ok (command line is ro root=/dev/VolGroup00/LogVol00)
Linux version 2.6.18-53.1.21.el5xen (mockbuild at builder10.centos.org) 
(gcc version 4.1.2 20070626 (Red Hat 4.1.2-14)) #1 SMP Tue May 20 
10:03:27 EDT 2008
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 00000001ef8fb000 (usable)
On node 0 totalpages: 2029819
  DMA zone: 2029819 pages, LIFO batch:31
DMI 2.5 present.
ACPI: RSDP (v002 DELL                                  ) @ 
ACPI: XSDT (v001 DELL    FX09    0x42302e31 AWRD 0x00000000) @ 
ACPI: FADT (v003 DELL    FX09    0x42302e31 AWRD 0x00000000) @ 
ACPI: HPET (v001 DELL    FX09    0x42302e31 AWRD 0x00000098) @ 
ACPI: MCFG (v001 DELL    FX09    0x42302e31 AWRD 0x00000000) @ 
ACPI: SLIC (v001 DELL    FX09    0x42302e31 AWRD 0x00000000) @ 
ACPI: OSFR (v001 DELL    FX09    0x42302e31 AWRD 0x00000000) @ 
ACPI: MADT (v001 DELL    FX09    0x42302e31 AWRD 0x00000000) @ 
ACPI: SSDT (v001  PmRef    CpuPm 0x00003000 INTL 0x20041203) @ 
ACPI: DSDT (v001 DELL   AWRDACPI 0x00001000 MSFT 0x03000000) @ 
ACPI: Local APIC address 0xfee00000
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x02] enabled)
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x03] enabled)
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x01] enabled)
ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x02] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x03] high edge lint[0x1])
ACPI: IOAPIC (id[0x04] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 4, version 32, address 0xfec00000, GSI 0-23
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
ACPI: IRQ0 used by override.
ACPI: IRQ2 used by override.
ACPI: IRQ9 used by override.
Setting APIC routing to xen
Using ACPI (MADT) for SMP configuration information
Allocating PCI resources starting at d0000000 (gap: cf600000:10a00000)
Built 1 zonelists.  Total pages: 2029819
Kernel command line: ro root=/dev/VolGroup00/LogVol00
Initializing CPU#0
PID hash table entries: 4096 (order: 12, 32768 bytes)
Xen reported: 2394.066 MHz processor.
Console: colour VGA+ 80x25
Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes)
Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes)
Software IO TLB enabled:
 Aperture:     64 megabytes
 Kernel range: 0xffff88000a9d9000 - 0xffff88000e9d9000
PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
Memory: 7875568k/8119276k available (2358k kernel code, 234816k 
reserved, 1325k data, 172k init)

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