Linux Network Proc/Debugging

===== Network device's MIB counters: cat /proc/net/dev =====

Note: it should match with ifconfig command
<file>
Inter-|   Receive                                         |  Transmit
face|bytes packets errs drop fifo frame compress multicast|bytes packets errs drop fifo colls carrier compress
eth0_1:  101570   541   0    0    0     0        0         0     936     12   0    0    0   0     0        0
eth0_5:    0      0     0    0    0     0        0         0     0       0    0    0    0   0     0        0
    lo:    0      0     0    0    0     0        0         0     0       0    0    0    0   0     0        0
   br0:    2592   34    0    0    0     0        0         0     468     6    0    0    0   0     0        0
eth0_0:    0      0     0    0    0     0        0         0     0       0    0    0    0   0     0        0
  eth1:    0      0     0    0    0     0        0         0    468      6    0    0    0   0     0        0
</file>


===== Per CPU Backlog queue status: cat /proc/net/softnet_stat =====
<file> 
Total    dropped time_squeeze -        -       -        -        -          -   cpu_collision 
</file>
    Total: Total packet number received, including below dropped number also
    dropped: packet dropped number for backlog queue full
    time_squeeze: 一次的软中断的触发还不能处理完目前已经接收的数据,因而要设置下轮软中断,time_squeeze 就表示设置的次数.
    cpu_collision: cpu冲突次数(net/sched.c)
<file>
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000245 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
</file>


===== Modify Network backlog queue length: echo xxx > /proc/sys/net/netdev_max_backlog =====