linux查看系统的硬件信息

blue@blue-pc:~$ lscpu
Architecture:          i686            #cpu架构
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian   #小尾序
CPU(s):                4               #总共有4核
On-line CPU(s) list:   0-3
Thread(s) per core:    1               #每个cpu核，只能支持一个线程，即不支持超线程
Core(s) per socket:    4               #每个cpu，有4个核
Socket(s):             1               #总共有1一个cpu
Vendor ID:             GenuineIntel    #cpu产商 intel
CPU family:            6
Model:                 42
Stepping:              7
CPU MHz:               1600.000
BogoMIPS:              5986.12
Virtualization:        VT-x            #支持cpu虚拟化技术
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              6144K

#cat /proc/cpuinfo
processor    : 0
vendor_id    : GenuineIntel
cpu family    : 6
model        : 42
model name    : Intel(R) Core(TM) i5-2320 CPU @ 3.00GHz
.....

free -m
             total       used       free     shared    buffers     cached
Mem:          3926       3651        274          0         12        404
-/+ buffers/cache:       3235        691
Swap:         9536         31       9505

dmidecode -t memory
# dmidecode 2.11
SMBIOS 2.7 present.

Handle 0x0008, DMI type 16, 23 bytes
Physical Memory Array
    Location: System Board Or Motherboard
....
    Maximum Capacity: 32 GB
....

Handle 0x000A, DMI type 17, 34 bytes
....
Memory Device
    Array Handle: 0x0008
    Error Information Handle: Not Provided
    Total Width: 64 bits
    Data Width: 64 bits
    Size: 4096 MB
.....

# lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 465.8G  0 disk 
├─sda1   8:1    0     1G  0 part /boot
├─sda2   8:2    0   9.3G  0 part [SWAP]
├─sda3   8:3    0  74.5G  0 part /
├─sda4   8:4    0     1K  0 part 
├─sda5   8:5    0 111.8G  0 part /home
└─sda6   8:6    0 269.2G  0 part

# fdisk -l

Disk /dev/sda: 500.1 GB, 500107862016 bytes
heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00023728

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2148351     1073152   83  Linux
/dev/sda2         2148352    21680127     9765888   82  Linux swap / Solaris
/dev/sda3        21680128   177930239    78125056   83  Linux
/dev/sda4       177932286   976771071   399419393    5  Extended/dev/sda5       177932288   412305407   117186560   83  Linux
/dev/sda6       412307456   976771071   282231808   83  Linux

# ifconfig -a
eth0      Link encap:以太网  硬件地址 b8:97:5a:17:b3:8f  
          .....

lo        Link encap:本地环回  
          .....

# ethtool eth0
Settings for eth0:
    Supported ports: [ TP MII ]
    Supported link modes:   10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Half 1000baseT/Full #支持千兆半双工，全双工模式
    Supported pause frame use: No 
    Supports auto-negotiation: Yes #支持自适应模式，一般都支持
    Advertised link modes:  10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Half 1000baseT/Full
    Advertised pause frame use: Symmetric Receive-only
    Advertised auto-negotiation: Yes #默认使用自适应模式
    Link partner advertised link modes:  10baseT/Half 10baseT/Full 
                                         100baseT/Half 100baseT/Full 
    .....
    Speed: 100Mb/s #现在网卡的速度是100Mb,网卡使用自适应模式，所以推测路由是100Mb，导致网卡从支持千兆，变成要支持百兆
    Duplex: Full   #全双工
    .....
    Link detected: yes    #表示有网线连接，和路由是通的

# dmidecode -t bios
......
BIOS Information
    Vendor: American Megatrends Inc.
    Version: 4.6.5
    Release Date: 04/25/2012
    .......
    BIOS Revision: 4.6
......