On Tuesday, June 3, 2003, at 09:44 PM, David Young wrote:
On Tue, Jun 03, 2003 at 08:25:23PM -0500, Brian Taylor wrote:Hello, I tried to search through the old topics, but could find none quite the same. If this topic has been covered before, please forgive me.
Have you tried lowering the 802.11 transmission retry count to 0?
In 802.11, a transmitter has to receive acknowledgement of the last
packet it sent in about 10 microseconds, or else it will retransmit
it. An 802.11 radio is typically set to retransmit about 5 times before
it gives up.
What does this do to the packets that really do need retransmission? My understanding was that the radios (cisco, etc) that can handle this situation do it by lengthening the waiting period, instead.
simon
On a 10 mile link, the roundtrip time is about 100 microseconds,
so ACKs are coming 90 microseconds too late. Every packet may be
retransmitted 5 times, which really cuts into your available bandwidth.
It may also play havoc with TCP, cutting the bandwidth even more.
Dave
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