Linux性能测试 dmesg命令

dmesg 命令主要用来显示内核信息。使用 dmesg 可以有效诊断机器硬件故障或者添加硬件出现的问题。 
另外，使用 dmesg 可以确定您的服务器安装了那些硬件。每次系统重启，系统都会检查所有硬件并将信息记录下来。执行/bin/dmesg 命令可以查看该记录。 
dmesg 输入实例： 

Linux version 2.6.9-42.ELsmp (bhcompile@hs20-bc1-1.build.redhat.com) (gcc version 3.4.6 20060404 (Red Hat 3.4.6-2)) #1 SMP Wed Jul 12 23:27:17 EDT 2006
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 00000000000a0000 (usable)
 BIOS-e820: 0000000000100000 - 000000001ffc0000 (usable)
 BIOS-e820: 000000001ffc0000 - 000000001ffcfc00 (ACPI data)
 BIOS-e820: 000000001ffcfc00 - 000000001ffff000 (reserved)
 BIOS-e820: 00000000f0000000 - 00000000f4000000 (reserved)
 BIOS-e820: 00000000fec00000 - 00000000fed00400 (reserved)
 BIOS-e820: 00000000fed13000 - 00000000feda0000 (reserved)
 BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved)
 BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
0MB HIGHMEM available.
511MB LOWMEM available.
found SMP MP-table at 000fe710
NX (Execute Disable) protection: active
On node 0 totalpages: 131008
  DMA zone: 4096 pages, LIFO batch:1
  Normal zone: 126912 pages, LIFO batch:16
  HighMem zone: 0 pages, LIFO batch:1
DMI 2.4 present.
Using APIC driver default
ACPI: RSDP (v002 DELL                                  ) @ 0x000fa030
ACPI: XSDT (v001 DELL   PE_SC3   0x00000001 MSFT 0x0100000a) @ 0x000fa0a0
ACPI: FADT (v003 DELL   PE_SC3   0x00000001 MSFT 0x0100000a) @ 0x000fa188
ACPI: MADT (v001 DELL   PE_SC3   0x00000001 MSFT 0x0100000a) @ 0x000fa27c
ACPI: SPCR (v001 DELL   PE_SC3   0x00000001 MSFT 0x0100000a) @ 0x000fa300
ACPI: HPET (v001 DELL   PE_SC3   0x00000001 MSFT 0x0100000a) @ 0x000fa350
ACPI: MCFG (v001 DELL   PE_SC3   0x00000001 MSFT 0x0100000a) @ 0x000fa388
ACPI: DSDT (v001 DELL   PE_SC3   0x00000001 MSFT 0x0100000e) @ 0x00000000
ACPI: PM-Timer IO Port: 0x808
ACPI: Local APIC address 0xfee00000
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
Processor #0 15:6 APIC version 20
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
Processor #1 15:6 APIC version 20
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x02] disabled)
ACPI: LAPIC (acpi_id[0x04] lapic_id[0x03] disabled)
ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x02] high edge lint[0x1])
Enabling APIC mode:  Flat.  Using 0 I/O APICs
ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23
ACPI: IOAPIC (id[0x03] address[0xfec10000] gsi_base[32])
IOAPIC[1]: apic_id 3, version 32, address 0xfec10000, GSI 32-55
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.
ACPI: HPET id: 0xffffffff base: 0xfed00000
Using ACPI (MADT) for SMP configuration information
Allocating PCI resources starting at 20000000 (gap: 1ffff000:d0001000)
Built 1 zonelists
Kernel command line: ro root=/dev/sda5
mapped APIC to ffffd000 (fee00000)
Initializing CPU#0
CPU 0 irqstacks, hard=c03ee000 soft=c03ce000
PID hash table entries: 2048 (order: 11, 32768 bytes)
Console: colour VGA+ 80x25
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 513372k/524032k available (1876k kernel code, 10032k reserved, 759k data, 184k init, 0k highmem)
Using HPET for base-timer
Using HPET for gettimeofday
Detected 3000.653 MHz processor.
Using hpet for high-res timesource
Calibrating delay using timer specific routine.. 6004.60 BogoMIPS (lpj=3002301)
Security Scaffold v1.0.0 initialized
SELinux:  Initializing.
SELinux:  Starting in permissive mode
There is already a security framework initialized, register_security failed.
selinux_register_security:  Registering secondary module capability
Capability LSM initialized as secondary
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
CPU: After generic identify, caps: bfebfbff 20100000 00000000 00000000
CPU: After vendor identify, caps:  bfebfbff 20100000 00000000 00000000
monitor/mwait feature present.
using mwait in idle threads.
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 2048K
CPU0: Physical Processor ID: 0
CPU0: Processor Core ID: 0
CPU0: Initial APIC ID: 0
CPU: After all inits, caps:        bfebfbff 20100000 00000000 00000080
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU0: Intel P4/Xeon Extended MCE MSRs (24) available
CPU0: Thermal monitoring enabled
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... OK.
CPU0: Intel(R) Pentium(R) D CPU 3.00GHz stepping 05
per-CPU timeslice cutoff: 1761.60 usecs.
task migration cache decay timeout: 2 msecs.
Booting processor 1/1 eip 3000
CPU 1 irqstacks, hard=c03ef000 soft=c03cf000
Initializing CPU#1
Calibrating delay using timer specific routine.. 6000.40 BogoMIPS (lpj=3000204)
CPU: After generic identify, caps: bfebfbff 20100000 00000000 00000000
CPU: After vendor identify, caps:  bfebfbff 20100000 00000000 00000000
monitor/mwait feature present.
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 2048K
CPU1: Physical Processor ID: 0
CPU1: Processor Core ID: 1
CPU1: Initial APIC ID: 1
CPU: After all inits, caps:        bfebfbff 20100000 00000000 00000080
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#1.
CPU1: Intel P4/Xeon Extended MCE MSRs (24) available
CPU1: Thermal monitoring enabled
CPU1: Intel(R) Pentium(R) D CPU 3.00GHz stepping 05
Total of 2 processors activated (12005.01 BogoMIPS).
ENABLING IO-APIC IRQs
..TIMER: vector=0x31 pin1=2 pin2=-1
checking TSC synchronization across 2 CPUs: passed.
Brought up 2 CPUs
zapping low mappings.
checking if image is initramfs... it is
Freeing initrd memory: 479k freed
NET: Registered protocol family 16
PCI: PCI BIOS revision 2.10 entry at 0xfbfee, last bus=6
PCI: Using MMCONFIG
mtrr: v2.0 (20020519)
ACPI: Subsystem revision 20040816
ACPI: Interpreter enabled
ACPI: Using IOAPIC for interrupt routing
ACPI: PCI Root Bridge [PCI0] (00:00)
PCI: Probing PCI hardware (bus 00)
PCI: Ignoring BAR0-3 of IDE controller 0000:00:1f.1
PCI: Transparent bridge - 0000:00:1e.0
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PES1._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEP0._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEP0.PXHA._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEP1._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEP2._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PCIS._PRT]
ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 *5 6 7 9 10 11 12)
ACPI: PCI Interrupt Link [LNKB] (IRQs *3 4 5 6 7 9 10 11 12)
ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 7 9 10 11 12) *0, disabled.
ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 9 10 *11 12)
ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 5 6 7 9 10 *11 12)
ACPI: PCI Interrupt Link [LNKF] (IRQs 3 4 5 6 7 9 *10 11 12)
ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 5 *6 7 9 10 11 12)
ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 5 6 7 9 10 11 12) *0, disabled.
Linux Plug and Play Support v0.97 (c) Adam Belay
usbcore: registered new driver usbfs
usbcore: registered new driver hub
PCI: Using ACPI for IRQ routing
ACPI: PCI interrupt 0000:00:01.0[A] -> GSI 16 (level, low) -> IRQ 169
ACPI: PCI interrupt 0000:00:1c.0[A] -> GSI 21 (level, low) -> IRQ 177
ACPI: PCI interrupt 0000:00:1c.4[B] -> GSI 22 (level, low) -> IRQ 185
ACPI: PCI interrupt 0000:00:1c.5[C] -> GSI 23 (level, low) -> IRQ 193
ACPI: PCI interrupt 0000:00:1d.0[A] -> GSI 20 (level, low) -> IRQ 201
ACPI: PCI interrupt 0000:00:1d.1[B] -> GSI 21 (level, low) -> IRQ 177
ACPI: PCI interrupt 0000:00:1d.2[C] -> GSI 22 (level, low) -> IRQ 185
ACPI: PCI interrupt 0000:00:1d.7[A] -> GSI 20 (level, low) -> IRQ 201
ACPI: PCI interrupt 0000:00:1f.1[A]: no GSI - using IRQ 0
ACPI: PCI interrupt 0000:00:1f.2[C] -> GSI 20 (level, low) -> IRQ 201
ACPI: PCI interrupt 0000:00:1f.3[B]: no GSI - using IRQ 0
ACPI: PCI interrupt 0000:01:00.0[A] -> GSI 16 (level, low) -> IRQ 169
ACPI: PCI interrupt 0000:01:00.1[B] -> GSI 17 (level, low) -> IRQ 209
ACPI: PCI interrupt 0000:04:00.0[A] -> GSI 16 (level, low) -> IRQ 169
ACPI: PCI interrupt 0000:05:00.0[A] -> GSI 17 (level, low) -> IRQ 209
ACPI: PCI interrupt 0000:06:05.0[A] -> GSI 19 (level, low) -> IRQ 217
apm: BIOS not found.
audit: initializing netlink socket (disabled)
audit(1343226664.647:1): initialized
Total HugeTLB memory allocated, 0
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
SELinux:  Registering netfilter hooks
Initializing Cryptographic API
ksign: Installing public key data
Loading keyring
- Added public key 8301CD821788A86B
- User ID: Red Hat, Inc. (Kernel Module GPG key)
pci_hotplug: PCI Hot Plug PCI Core version: 0.5
ACPI: Processor [CPU0] (supports C1)
ACPI: Processor [CPU1] (supports C1)
Real Time Clock Driver v1.12
Linux agpgart interface v0.100 (c) Dave Jones
serio: i8042 AUX port at 0x60,0x64 irq 12
serio: i8042 KBD port at 0x60,0x64 irq 1
Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing enabled
ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
RAMDISK driver initialized: 16 RAM disks of 16384K size 1024 blocksize
divert: not allocating divert_blk for non-ethernet device lo
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
ICH7: IDE controller at PCI slot 0000:00:1f.1
ACPI: PCI interrupt 0000:00:1f.1[A]: no GSI - using IRQ 0
ICH7: chipset revision 1
ICH7: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xfc00-0xfc07, BIOS settings: hda:DMA, hdb:pio
Probing IDE interface ide0...
hda: HL-DT-ST GCR-8240N, ATAPI CD/DVD-ROM drive
Using cfq io scheduler
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
Probing IDE interface ide1...
Probing IDE interface ide2...
Probing IDE interface ide3...
Probing IDE interface ide4...
Probing IDE interface ide5...
hda: ATAPI 24X CD-ROM drive, 128kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.20
ide-floppy driver 0.99.newide
usbcore: registered new driver hiddev
usbcore: registered new driver usbhid
drivers/usb/input/hid-core.c: v2.0:USB HID core driver
mice: PS/2 mouse device common for all mice
md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27
NET: Registered protocol family 2
IP route cache hash table entries: 8192 (order: 3, 32768 bytes)
TCP established hash table entries: 32768 (order: 7, 524288 bytes)
TCP bind hash table entries: 32768 (order: 6, 393216 bytes)
TCP: Hash tables configured (established 32768 bind 32768)
Initializing IPsec netlink socket
NET: Registered protocol family 1
NET: Registered protocol family 17
ACPI: (supports S0 S4 S5)
ACPI wakeup devices: 
PCI0 PES1 PEP0 PXHA PEP1 PEP2 PCIS 
Freeing unused kernel memory: 184k freed
SCSI subsystem initialized
libata version 1.20 loaded.
ata_piix 0000:00:1f.2: version 1.05
ata_piix 0000:00:1f.2: MAP [ P0 P2 P1 P3 ]
ACPI: PCI interrupt 0000:00:1f.2[C] -> GSI 20 (level, low) -> IRQ 201
PCI: Setting latency timer of device 0000:00:1f.2 to 64
ata1: SATA max UDMA/133 cmd 0xAC98 ctl 0xAC92 bmdma 0xAC60 irq 201
ata2: SATA max UDMA/133 cmd 0xAC80 ctl 0xAC7A bmdma 0xAC68 irq 201
ata1: dev 0 cfg 49:2f00 82:746b 83:7f61 84:4163 85:7469 86:3c41 87:4163 88:207f
ata1: dev 0 ATA-7, max UDMA/133, 156250000 sectors: LBA48
ata1: dev 0 configured for UDMA/133
scsi0 : ata_piix
ata2: dev 0 cfg 49:2f00 82:746b 83:7f61 84:4163 85:7469 86:3c41 87:4163 88:207f
ata2: dev 0 ATA-7, max UDMA/133, 156250000 sectors: LBA48
ata2: dev 0 configured for UDMA/133
scsi1 : ata_piix
  Vendor: ATA       Model: WDC WD800AAJS-18  Rev: 01.0
  Type:   Direct-Access                      ANSI SCSI revision: 05
SCSI device sda: 156250000 512-byte hdwr sectors (80000 MB)
SCSI device sda: drive cache: write back
SCSI device sda: 156250000 512-byte hdwr sectors (80000 MB)
SCSI device sda: drive cache: write back
 sda: sda1 sda2 sda3 sda4 < sda5 >
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
  Vendor: ATA       Model: WDC WD800AAJS-18  Rev: 01.0
  Type:   Direct-Access                      ANSI SCSI revision: 05
SCSI device sdb: 156250000 512-byte hdwr sectors (80000 MB)
SCSI device sdb: drive cache: write back
SCSI device sdb: 156250000 512-byte hdwr sectors (80000 MB)
SCSI device sdb: drive cache: write back
 sdb: sdb1
Attached scsi disk sdb at scsi1, channel 0, id 0, lun 0
kjournald starting.  Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
SELinux:  Disabled at runtime.
SELinux:  Unregistering netfilter hooks
inserting floppy driver for 2.6.9-42.ELsmp
Floppy drive(s): fd0 is 1.44M
floppy0: no floppy controllers found
tg3.c:v3.52-rh (Mar 06, 2006)
ACPI: PCI interrupt 0000:04:00.0[A] -> GSI 16 (level, low) -> IRQ 169
PCI: Setting latency timer of device 0000:04:00.0 to 64
divert: allocating divert_blk for eth0
eth0: Tigon3 [partno(BCM95721) rev 4101 PHY(5750)] (PCI Express) 10/100/1000BaseT Ethernet 00:18:8b:f9:3d:20
eth0: RXcsums[1] LinkChgREG[1] MIirq[1] ASF[1] Split[0] WireSpeed[1] TSOcap[1] 
eth0: dma_rwctrl[76180000]
ACPI: PCI interrupt 0000:05:00.0[A] -> GSI 17 (level, low) -> IRQ 209
PCI: Setting latency timer of device 0000:05:00.0 to 64
divert: allocating divert_blk for eth1
eth1: Tigon3 [partno(BCM95721) rev 4101 PHY(5750)] (PCI Express) 10/100/1000BaseT Ethernet 00:18:8b:f9:3d:21
eth1: RXcsums[1] LinkChgREG[1] MIirq[1] ASF[1] Split[0] WireSpeed[1] TSOcap[1] 
eth1: dma_rwctrl[76180000]
Intel(R) PRO/1000 Network Driver - version 7.0.33-k2-NAPI
Copyright (c) 1999-2005 Intel Corporation.
ACPI: PCI interrupt 0000:01:00.0[A] -> GSI 16 (level, low) -> IRQ 169
PCI: Setting latency timer of device 0000:01:00.0 to 64
e1000: 0000:01:00.0: e1000_probe: (PCI Express:2.5Gb/s:Width x4) 00:15:17:3a:fa:18
divert: allocating divert_blk for eth2
e1000: eth2: e1000_probe: Intel(R) PRO/1000 Network Connection
ACPI: PCI interrupt 0000:01:00.1[B] -> GSI 17 (level, low) -> IRQ 209
PCI: Setting latency timer of device 0000:01:00.1 to 64
e1000: 0000:01:00.1: e1000_probe: (PCI Express:2.5Gb/s:Width x4) 00:15:17:3a:fa:19
divert: allocating divert_blk for eth3
e1000: eth3: e1000_probe: Intel(R) PRO/1000 Network Connection
hw_random: RNG not detected
ACPI: PCI interrupt 0000:00:1d.7[A] -> GSI 20 (level, low) -> IRQ 201
ehci_hcd 0000:00:1d.7: EHCI Host Controller
PCI: Setting latency timer of device 0000:00:1d.7 to 64
ehci_hcd 0000:00:1d.7: irq 201, pci mem e0818400
ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 1
PCI: cache line size of 128 is not supported by device 0000:00:1d.7
ehci_hcd 0000:00:1d.7: USB 2.0 enabled, EHCI 1.00, driver 2004-May-10
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 6 ports detected
USB Universal Host Controller Interface driver v2.2
ACPI: PCI interrupt 0000:00:1d.0[A] -> GSI 20 (level, low) -> IRQ 201
uhci_hcd 0000:00:1d.0: UHCI Host Controller
PCI: Setting latency timer of device 0000:00:1d.0 to 64
uhci_hcd 0000:00:1d.0: irq 201, io base 0000ace0
uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 2
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 2 ports detected
ACPI: PCI interrupt 0000:00:1d.1[B] -> GSI 21 (level, low) -> IRQ 177
uhci_hcd 0000:00:1d.1: UHCI Host Controller
PCI: Setting latency timer of device 0000:00:1d.1 to 64
uhci_hcd 0000:00:1d.1: irq 177, io base 0000acc0
uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 3
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 2 ports detected
ACPI: PCI interrupt 0000:00:1d.2[C] -> GSI 22 (level, low) -> IRQ 185
uhci_hcd 0000:00:1d.2: UHCI Host Controller
PCI: Setting latency timer of device 0000:00:1d.2 to 64
uhci_hcd 0000:00:1d.2: irq 185, io base 0000aca0
uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 4
hub 4-0:1.0: USB hub found
hub 4-0:1.0: 2 ports detected
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
usb 1-3: new high speed USB device using address 2
hub 1-3:1.0: USB hub found
hub 1-3:1.0: 4 ports detected
ACPI: Power Button (FF) [PWRF]
EXT3 FS on sda5, internal journal
device-mapper: 4.5.0-ioctl (2005-10-04) initialised: dm-devel@redhat.com
cdrom: open failed.
kjournald starting.  Commit interval 5 seconds
EXT3 FS on sda1, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
kjournald starting.  Commit interval 5 seconds
EXT3 FS on sdb1, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
kjournald starting.  Commit interval 5 seconds
EXT3 FS on sda2, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
Adding 2008116k swap on /dev/sda3.  Priority:-1 extents:1
ip_tables: (C) 2000-2002 Netfilter core team
ip_tables: (C) 2000-2002 Netfilter core team
tg3: eth0: Link is up at 100 Mbps, half duplex.
tg3: eth0: Flow control is off for TX and off for RX.
ip_tables: (C) 2000-2002 Netfilter core team
hsfosspec: Unknown parameter `'
hsfengine: module license 'see LICENSE file distributed with driver' taints kernel.
hsfserial: Unknown parameter `'
usbcore: registered new driver hsfusbcd2