Wireshark-users: [Wireshark-users] what is the upper limit of buffer size?

Date: Fri, 20 Mar 2009 14:45:14 +0800
Hi guys:
      I use wireshark for realtime packets capture at 640Mbps and found packets drop, and i want to set a large kernel buffer, but i only found 127MB can be set, but my memory is 3GB and has 2.6G available.
     why?