Re: libpcap capture performance drop

[Guy Harris <guy () alum mit edu>]

On May 27, 2011, at 12:04 PM, Ben Greear wrote:

> Might want to add an extra 4 bytes for a possible VLAN header too.

prepare_tpacket_socket() sets the "reserve" for VLAN tag reconstruction to 4; the "reserve", along with the maximum 
packet size, is involved in calculating the frame slot size.  (It's complicated, which is why I'm in the middle of 
writing a long comment in the code explaining what's in a frame slot, and how the calculation of the frame slot size is 
done.)-
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