Re: listener missing lots of udp broadcasts
Re: listener missing lots of udp broadcasts
- Subject: Re: listener missing lots of udp broadcasts
- From: "Quinn \"The Eskimo!\"" <email@hidden>
- Date: Mon, 06 Jan 2014 10:26:39 +0000
On 27 Dec 2013, at 20:24, Jens Alfke <email@hidden> wrote:
> Reading between the lines, I’m guessing that WiFi packets/frames intrinsically have a very high rate of loss, high enough that they had to add an ACK to the protocol to bring it up to the fidelity levels of Ethernet [...]
Right. The annoying part is that this is basically unnecessary, because the high-level protocols that we run over Wi-Fi already cope with packet loss. Not only that, it's actively bad, because the delays caused by this retransmission conflict with TCP's retransmission mechanisms. This isn't a huge problem with Wi-Fi but it really messes things up on WWAN.
If you want to get an idea of the underlying packet loss rate on Wi-Fi, you need to look at a Wi-Fi level packet trace. You can do this from the Mac using the instructions in QA1176 "Getting a Packet Trace".
<https://developer.apple.com/library/mac/#qa/qa1176/_index.html>
Share and Enjoy
--
Quinn "The Eskimo!" <http://www.apple.com/developer/>
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
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