[time-nuts] wifi with time sync
chris at chriscaudle.org
Fri Jan 13 17:19:56 EST 2017
On Fri, January 13, 2017 3:17 pm, Bob Camp wrote:
> It just so happens that I'm trying to track down an issue with my WiFi
> as I type this.
This is getting off topic for time-nuts very quickly, but use bufferbloat
and "make wifi fast" as search phrases. The guy who did a lot of the work
on queue disciplines to solve bufferbloat (over sized buffers in network
devices and drivers adding unnecessary excess latency) turned his
attention to Wi-Fi and found that Wi-Fi devices and drivers were even
worse, and the devices often had firmware running on them that hid the
sources of latency.
Because you need to be able to measure latency and bandwidth concurrently
they put together some scripts using combinations of iperf, netperf, ping,
and other tools running concurrently to measure latency under conditions
of various levels of simultaneous bandwidth use.
You can start here:
For the level of problem you are trying to diagnose ping is probably an
appropriate tool, although it doesn't give much diagnostic information
when the reply time increases, it is more of a "what" than a "why" tool.
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