dmesg如何只保留开机信息

zbs168

请教下，开机后执行dmesg，可以看到

1. [    0.000000]  BIOS-e820: 0000000000000000 - 000000000009b000 (usable)
   
2. [    0.000000]  BIOS-e820: 000000000009b000 - 00000000000a0000 (reserved)
   
3. [    0.000000]  BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
   
4. [    0.000000]  BIOS-e820: 0000000000100000 - 00000000c77e0000 (usable)
   
5. [    0.000000]  BIOS-e820: 00000000c77e0000 - 00000000c77ee000 (ACPI data)
   
6. [    0.000000]  BIOS-e820: 00000000c77ee000 - 00000000c7800000 (ACPI NVS)
   
7. [    0.000000]  BIOS-e820: 00000000f0000000 - 00000000f4000000 (reserved)
   

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以上这种信息，但随着系统使用时间增长，再运行dmesg后，显示的信息就变为了

1. [2970768.086568] TCP: Possible SYN flooding on port 53. Sending cookies.
   
2. [2970768.087026] TCP: Possible SYN flooding on port 53. Sending cookies.
   
3. [2970768.087122] TCP: Possible SYN flooding on port 53. Sending cookies.
   
4. [3005752.097465] TCP: Possible SYN flooding on port 53. Sending cookies.
   
5. [3005752.098107] TCP: Possible SYN flooding on port 53. Sending cookies.
   
6. [3005752.098807] TCP: Possible SYN flooding on port 53. Sending cookies.
   
7. [3005752.098825] TCP: Possible SYN flooding on port 53. Sending cookies.
   
8. [3005752.102456] TCP: Possible SYN flooding on port 53. Sending cookies.
   
9. [3005752.102501] TCP: Possible SYN flooding on port 53. Sending cookies.
   
10. [3005752.102757] TCP: Possible SYN flooding on port 53. Sending cookies.
    
11. [3005752.102852] TCP: Possible SYN flooding on port 53. Sending cookies.
    
12. [3005752.102870] TCP: Possible SYN flooding on port 53. Sending cookies.
    
13. [3005752.102948] TCP: Possible SYN flooding on port 53. Sending cookies.
    

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请问如何配置，使得不管什么时候，运行dmesg都显示的是开机的信息，而不是内核打印信息