[ntp:questions] Windows and Wi-Fi - starts well, frequency steps?

Rob nomail at example.com
Thu Dec 29 09:24:17 UTC 2011


Dave Hart <davehart at gmail.com> wrote:
> On Wed, Dec 28, 2011 at 21:54, David Malone
> <dwmalone at walton.maths.tcd.ie> wrote:
>> Modern hardware that supports 802.11e (or 802.11n, which requires
>> much of the QoS part of 11e) can control things like the number of
>> retries, and you could hack the driver to inspect the packets and
>> if it is NTP to reduce the number of retires.
>
> I recognize I'm suggesting a layer violation in wishing 802.11 devices
> treated UDP differently from TCP, or even worse in terms of layer
> violation, UDP 123 differently from UDP 53.  It's not pretty, but it
> would make a positive difference.  The ideal number of retries for NTP
> may be zero, assuming the radio layer loss rates are less than 87.5%
> in practice.

When NTP wants special treatments of its packets, it should set the
TOS/DiffServ field, e.g. to LOWDELAY or EF.

Of course when that IP traffic is sent over untagged (not 802.1q)
ethernet that information is lost anyway.  But a directly connected
802.11 device could possibly look at it.



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