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 ([e-mail]) (gcc version 3.4.6 20060404 (Red Hat 3.4.6-2)) #1 SMP Wed Jul 12 23:27:17 EDT 2006BIOS-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 000fe710NX (Execute Disable) protection: activeOn node 0 totalpages: 131008  DMA zone: 4096 pages, LIFO batch:1  Normal zone: 126912 pages, LIFO batch:16  HighMem zone: 0 pages, LIFO batch:1DMI 2.4 present.Using APIC driver defaultACPI: RSDP (v002 DELL                                  ) @ 0x000fa030ACPI: XSDT (v001 DELL   PE_SC3   0x00000001 MSFT 0x0100000a) @ 0x000fa0a0ACPI: FADT (v003 DELL   PE_SC3   0x00000001 MSFT 0x0100000a) @ 0x000fa188ACPI: MADT (v001 DELL   PE_SC3   0x00000001 MSFT 0x0100000a) @ 0x000fa27cACPI: SPCR (v001 DELL   PE_SC3   0x00000001 MSFT 0x0100000a) @ 0x000fa300ACPI: HPET (v001 DELL   PE_SC3   0x00000001 MSFT 0x0100000a) @ 0x000fa350ACPI: MCFG (v001 DELL   PE_SC3   0x00000001 MSFT 0x0100000a) @ 0x000fa388ACPI: DSDT (v001 DELL   PE_SC3   0x00000001 MSFT 0x0100000e) @ 0x00000000ACPI: PM-Timer IO Port: 0x808ACPI: Local APIC address 0xfee00000ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)Processor #0 15:6 APIC version 20ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)Processor #1 15:6 APIC version 20ACPI: 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 APICsACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0])IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23ACPI: IOAPIC (id[0x03] address[0xfec10000] gsi_base[32])IOAPIC[1]: apic_id 3, version 32, address 0xfec10000, GSI 32-55ACPI: 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: 0xfed00000Using ACPI (MADT) for SMP configuration informationAllocating PCI resources starting at 20000000 (gap: 1ffff000:d0001000)Built 1 zonelistsKernel command line: ro root=/dev/sda5mapped APIC to ffffd000 (fee00000)Initializing CPU#0CPU 0 irqstacks, hard=c03ee000 soft=c03ce000PID hash table entries: 2048 (order: 11, 32768 bytes)Console: colour VGA+ 80x25Dentry 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-timerUsing HPET for gettimeofdayDetected 3000.653 MHz processor.Using hpet for high-res timesourceCalibrating delay using timer specific routine.. 6004.60 BogoMIPS (lpj=3002301)Security Scaffold v1.0.0 initializedSELinux:  Initializing.SELinux:  Starting in permissive modeThere is already a security framework initialized, register_security failed.selinux_register_security:  Registering secondary module capabilityCapability LSM initialized as secondaryMount-cache hash table entries: 512 (order: 0, 4096 bytes)CPU: After generic identify, caps: bfebfbff 20100000 00000000 00000000CPU: After vendor identify, caps:  bfebfbff 20100000 00000000 00000000monitor/mwait feature present.using mwait in idle threads.CPU: Trace cache: 12K uops, L1 D cache: 16KCPU: L2 cache: 2048KCPU0: Physical Processor ID: 0CPU0: Processor Core ID: 0CPU0: Initial APIC ID: 0CPU: After all inits, caps:        bfebfbff 20100000 00000000 00000080Intel machine check architecture supported.Intel machine check reporting enabled on CPU#0.CPU0: Intel P4/Xeon Extended MCE MSRs (24) availableCPU0: Thermal monitoring enabledEnabling 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 05per-CPU timeslice cutoff: 1761.60 usecs.task migration cache decay timeout: 2 msecs.Booting processor 1/1 eip 3000CPU 1 irqstacks, hard=c03ef000 soft=c03cf000Initializing CPU#1Calibrating delay using timer specific routine.. 6000.40 BogoMIPS (lpj=3000204)CPU: After generic identify, caps: bfebfbff 20100000 00000000 00000000CPU: After vendor identify, caps:  bfebfbff 20100000 00000000 00000000monitor/mwait feature present.CPU: Trace cache: 12K uops, L1 D cache: 16KCPU: L2 cache: 2048KCPU1: Physical Processor ID: 0CPU1: Processor Core ID: 1CPU1: Initial APIC ID: 1CPU: After all inits, caps:        bfebfbff 20100000 00000000 00000080Intel machine check architecture supported.Intel machine check reporting enabled on CPU#1.CPU1: Intel P4/Xeon Extended MCE MSRs (24) availableCPU1: Thermal monitoring enabledCPU1: Intel(R) Pentium(R) D CPU 3.00GHz stepping 05Total of 2 processors activated (12005.01 BogoMIPS).ENABLING IO-APIC IRQs..TIMER: vector=0x31 pin1=2 pin2=-1checking TSC synchronization across 2 CPUs: passed.Brought up 2 CPUszapping low mappings.checking if image is initramfs... it isFreeing initrd memory: 479k freedNET: Registered protocol family 16PCI: PCI BIOS revision 2.10 entry at 0xfbfee, last bus=6PCI: Using MMCONFIGmtrr: v2.0 (20020519)ACPI: Subsystem revision 20040816ACPI: Interpreter enabledACPI: Using IOAPIC for interrupt routingACPI: PCI Root Bridge [PCI0] (00:00)PCI: Probing PCI hardware (bus 00)PCI: Ignoring BAR0-3 of IDE controller 0000:00:1f.1PCI: Transparent bridge - 0000:00:1e.0ACPI: 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 Belayusbcore: registered new driver usbfsusbcore: registered new driver hubPCI: Using ACPI for IRQ routingACPI: PCI interrupt 0000:00:01.0[A] -> GSI 16 (level, low) -> IRQ 169ACPI: PCI interrupt 0000:00:1c.0[A] -> GSI 21 (level, low) -> IRQ 177ACPI: PCI interrupt 0000:00:1c.4[B] -> GSI 22 (level, low) -> IRQ 185ACPI: PCI interrupt 0000:00:1c.5[C] -> GSI 23 (level, low) -> IRQ 193ACPI: PCI interrupt 0000:00:1d.0[A] -> GSI 20 (level, low) -> IRQ 201ACPI: PCI interrupt 0000:00:1d.1[B] -> GSI 21 (level, low) -> IRQ 177ACPI: PCI interrupt 0000:00:1d.2[C] -> GSI 22 (level, low) -> IRQ 185ACPI: PCI interrupt 0000:00:1d.7[A] -> GSI 20 (level, low) -> IRQ 201ACPI: PCI interrupt 0000:00:1f.1[A]: no GSI - using IRQ 0ACPI: PCI interrupt 0000:00:1f.2[C] -> GSI 20 (level, low) -> IRQ 201ACPI: PCI interrupt 0000:00:1f.3[B]: no GSI - using IRQ 0ACPI: PCI interrupt 0000:01:00.0[A] -> GSI 16 (level, low) -> IRQ 169ACPI: PCI interrupt 0000:01:00.1[B] -> GSI 17 (level, low) -> IRQ 209ACPI: PCI interrupt 0000:04:00.0[A] -> GSI 16 (level, low) -> IRQ 169ACPI: PCI interrupt 0000:05:00.0[A] -> GSI 17 (level, low) -> IRQ 209ACPI: PCI interrupt 0000:06:05.0[A] -> GSI 19 (level, low) -> IRQ 217apm: BIOS not found.audit: initializing netlink socket (disabled)audit(1343226664.647:1): initializedTotal HugeTLB memory allocated, 0VFS: Disk quotas dquot_6.5.1Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)SELinux:  Registering netfilter hooksInitializing Cryptographic APIksign: Installing public key dataLoading keyring- Added public key 8301CD821788A86B- User ID: Red Hat, Inc. (Kernel Module GPG key)pci_hotplug: PCI Hot Plug PCI Core version: 0.5ACPI: Processor [CPU0] (supports C1)ACPI: Processor [CPU1] (supports C1)Real Time Clock Driver v1.12Linux agpgart interface v0.100 (c) Dave Jonesserio: i8042 AUX port at 0x60,0x64 irq 12serio: i8042 KBD port at 0x60,0x64 irq 1Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing enabledttyS0 at I/O 0x3f8 (irq = 4) is a 16550ARAMDISK driver initialized: 16 RAM disks of 16384K size 1024 blocksizedivert: not allocating divert_blk for non-ethernet device loUniform Multi-Platform E-IDE driver Revision: 7.00alpha2ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xxICH7: IDE controller at PCI slot 0000:00:1f.1ACPI: PCI interrupt 0000:00:1f.1[A]: no GSI - using IRQ 0ICH7: chipset revision 1ICH7: not 100% native mode: will probe irqs later    ide0: BM-DMA at 0xfc00-0xfc07, BIOS settings: hda:DMA, hdb:pioProbing IDE interface ide0...hda: HL-DT-ST GCR-8240N, ATAPI CD/DVD-ROM driveUsing cfq io scheduleride0 at 0x1f0-0x1f7,0x3f6 on irq 14Probing 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: 3.20ide-floppy driver 0.99.newideusbcore: registered new driver hiddevusbcore: registered new driver usbhiddrivers/usb/input/hid-core.c: v2.0:USB HID core drivermice: PS/2 mouse device common for all micemd: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27NET: Registered protocol family 2IP 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 socketNET: Registered protocol family 1NET: Registered protocol family 17ACPI: (supports S0 S4 S5)ACPI wakeup devices: PCI0 PES1 PEP0 PXHA PEP1 PEP2 PCIS Freeing unused kernel memory: 184k freedSCSI subsystem initializedlibata version 1.20 loaded.ata_piix 0000:00:1f.2: version 1.05ata_piix 0000:00:1f.2: MAP [ P0 P2 P1 P3 ]ACPI: PCI interrupt 0000:00:1f.2[C] -> GSI 20 (level, low) -> IRQ 201PCI: Setting latency timer of device 0000:00:1f.2 to 64ata1: SATA max UDMA/133 cmd 0xAC98 ctl 0xAC92 bmdma 0xAC60 irq 201ata2: SATA max UDMA/133 cmd 0xAC80 ctl 0xAC7A bmdma 0xAC68 irq 201ata1: dev 0 cfg 49:2f00 82:746b 83:7f61 84:4163 85:7469 86:3c41 87:4163 88:207fata1: dev 0 ATA-7, max UDMA/133, 156250000 sectors: LBA48ata1: dev 0 configured for UDMA/133scsi0 : ata_piixata2: dev 0 cfg 49:2f00 82:746b 83:7f61 84:4163 85:7469 86:3c41 87:4163 88:207fata2: dev 0 ATA-7, max UDMA/133, 156250000 sectors: LBA48ata2: dev 0 configured for UDMA/133scsi1 : ata_piix  Vendor: ATA       Model: WDC WD800AAJS-18  Rev: 01.0  Type:   Direct-Access                      ANSI SCSI revision: 05SCSI device sda: 156250000 512-byte hdwr sectors (80000 MB)SCSI device sda: drive cache: write backSCSI 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: 05SCSI device sdb: 156250000 512-byte hdwr sectors (80000 MB)SCSI device sdb: drive cache: write backSCSI device sdb: 156250000 512-byte hdwr sectors (80000 MB)SCSI device sdb: drive cache: write back sdb: sdb1Attached scsi disk sdb at scsi1, channel 0, id 0, lun 0kjournald starting.  Commit interval 5 secondsEXT3-fs: mounted filesystem with ordered data mode.SELinux:  Disabled at runtime.SELinux:  Unregistering netfilter hooksinserting floppy driver for 2.6.9-42.ELsmpFloppy drive(s): fd0 is 1.44Mfloppy0: no floppy controllers foundtg3.c:v3.52-rh (Mar 06, 2006)ACPI: PCI interrupt 0000:04:00.0[A] -> GSI 16 (level, low) -> IRQ 169PCI: Setting latency timer of device 0000:04:00.0 to 64divert: allocating divert_blk for eth0eth0: Tigon3 [partno(BCM95721) rev 4101 PHY(5750)] (PCI Express) 10/100/1000BaseT Ethernet 00:18:8b:f9:3d:20eth0: 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 209PCI: Setting latency timer of device 0000:05:00.0 to 64divert: allocating divert_blk for eth1eth1: Tigon3 [partno(BCM95721) rev 4101 PHY(5750)] (PCI Express) 10/100/1000BaseT Ethernet 00:18:8b:f9:3d:21eth1: 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-NAPICopyright (c) 1999-2005 Intel Corporation.ACPI: PCI interrupt 0000:01:00.0[A] -> GSI 16 (level, low) -> IRQ 169PCI: Setting latency timer of device 0000:01:00.0 to 64e1000: 0000:01:00.0: e1000_probe: (PCI Express:2.5Gb/s:Width x4) 00:15:17:3a:fa:18divert: allocating divert_blk for eth2e1000: eth2: e1000_probe: Intel(R) PRO/1000 Network ConnectionACPI: PCI interrupt 0000:01:00.1[B] -> GSI 17 (level, low) -> IRQ 209PCI: Setting latency timer of device 0000:01:00.1 to 64e1000: 0000:01:00.1: e1000_probe: (PCI Express:2.5Gb/s:Width x4) 00:15:17:3a:fa:19divert: allocating divert_blk for eth3e1000: eth3: e1000_probe: Intel(R) PRO/1000 Network Connectionhw_random: RNG not detectedACPI: PCI interrupt 0000:00:1d.7[A] -> GSI 20 (level, low) -> IRQ 201ehci_hcd 0000:00:1d.7: EHCI Host ControllerPCI: Setting latency timer of device 0000:00:1d.7 to 64ehci_hcd 0000:00:1d.7: irq 201, pci mem e0818400ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 1PCI: cache line size of 128 is not supported by device 0000:00:1d.7ehci_hcd 0000:00:1d.7: USB 2.0 enabled, EHCI 1.00, driver 2004-May-10hub 1-0:1.0: USB hub foundhub 1-0:1.0: 6 ports detectedUSB Universal Host Controller Interface driver v2.2ACPI: PCI interrupt 0000:00:1d.0[A] -> GSI 20 (level, low) -> IRQ 201uhci_hcd 0000:00:1d.0: UHCI Host ControllerPCI: Setting latency timer of device 0000:00:1d.0 to 64uhci_hcd 0000:00:1d.0: irq 201, io base 0000ace0uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 2hub 2-0:1.0: USB hub foundhub 2-0:1.0: 2 ports detectedACPI: PCI interrupt 0000:00:1d.1[B] -> GSI 21 (level, low) -> IRQ 177uhci_hcd 0000:00:1d.1: UHCI Host ControllerPCI: Setting latency timer of device 0000:00:1d.1 to 64uhci_hcd 0000:00:1d.1: irq 177, io base 0000acc0uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 3hub 3-0:1.0: USB hub foundhub 3-0:1.0: 2 ports detectedACPI: PCI interrupt 0000:00:1d.2[C] -> GSI 22 (level, low) -> IRQ 185uhci_hcd 0000:00:1d.2: UHCI Host ControllerPCI: Setting latency timer of device 0000:00:1d.2 to 64uhci_hcd 0000:00:1d.2: irq 185, io base 0000aca0uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 4hub 4-0:1.0: USB hub foundhub 4-0:1.0: 2 ports detectedmd: Autodetecting RAID arrays.md: autorun ...md: ... autorun DONE.usb 1-3: new high speed USB device using address 2hub 1-3:1.0: USB hub foundhub 1-3:1.0: 4 ports detectedACPI: Power Button (FF) [PWRF]EXT3 FS on sda5, internal journaldevice-mapper: 4.5.0-ioctl (2005-10-04) initialised: [e-mail]: open failed.kjournald starting.  Commit interval 5 secondsEXT3 FS on sda1, internal journalEXT3-fs: mounted filesystem with ordered data mode.kjournald starting.  Commit interval 5 secondsEXT3 FS on sdb1, internal journalEXT3-fs: mounted filesystem with ordered data mode.kjournald starting.  Commit interval 5 secondsEXT3 FS on sda2, internal journalEXT3-fs: mounted filesystem with ordered data mode.Adding 2008116k swap on /dev/sda3.  Priority:-1 extents:1ip_tables: (C) 2000-2002 Netfilter core teamip_tables: (C) 2000-2002 Netfilter core teamtg3: 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 teamhsfosspec: Unknown parameter `'hsfengine: module license 'see LICENSE file distributed with driver' taints kernel.hsfserial: Unknown parameter `'usbcore: registered new driver hsfusbcd2