[Winpcap-users] How can i get thenew-estpacketfrombuffer?HELPPLEASE~!

rst slash at realscene.com.tw
Tue May 26 02:19:27 PDT 2009

The machine always sending packets , never stop.
and my computer only connected with the machine (using a crossover network cable).
so every packets I get are what I wanted, but only the newest packet I need.

Machine ----(Sending packets)---> My Computer    .........................every 0.000005 second

My Application ----(Get the newest packet)---> Get information to do control...................every 0.0001 second

if the buffer can contrain 10000 packets,
0.000005 * 10000 = 0.05 second,
so I can only get the information before 0.05 second,
but in my realtime control, i must get the information less than 0.0001 second.

so have any ideas?

Really thank you!!

  If the other machine is sending a constant 200,000 packets per second and won't slow down, you may be out of luck.  However, if the other machine sends 200,000 packet per second for a short burst (say 10 seconds), then you should be able to store those 2M packets into your own memory space.  After you store the packets, you can do your analysis.

  For a quick test, just change your control loop to do...

  static int counter;


  That is, don't do anything with the packet (other than advance the buffer and count how many you receive).  This will tell you how fast your machine can move through the buffer.

  If this works well, then you need to do a memcpy() of the packet into pre-allocated space (i.e. malloc your own circular queue).  This will slow down the loop, but should be much faster than 0.1ms.

  Last question:  Most packet capturing applications need to decode EVERY packet, are you saying that you do NOT need to decode every packet?  If not, how do you know which packets you need to decode and which ones you don't?

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