How to recognize ACK event
zhangho at cis.ohio-state.edu
Sun Aug 1 18:20:16 EDT 2004
Thanks for your reply.
>>Just to share my recent experience with hostap-ver-0.1.3, I found that
>>multiple TX interrupts seem to pop up for the transmission of a single
>>short UDP packet. This happens to unicast packets, but does not happen
>>to broadcast packets. I wonder what may be the cause for this
>I have no clue about your actual test environment, but...
I used two Linux boxes (Stargates 7.1 from Intel Research), with kernel
2.4.19 patched with wireless exetension 14. One node keeps sending
packets to the other node at some frequencies. I changed iwevent.c and
hostap_hw.c to check the number of TX as well as TXEXC interrupts from
the the firmware, then I compared this number to that of the short
packets sent in the application.
I wonder if the driver sends some control packets for certain
>Perhaps it's just that you're seeing the ARP request + the UDP
>transmission for unicast transmissions, while there's no ARP request for
In my program, I used MAC address when calling UDP socket functions, so
there should not be any involvement of ARP even for unicast. Please
correct me if I missed anything obvious here?
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