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Re: [question] panic when calling drv_get_tsf

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Bob Copeland <me@...> writes:


Hi Bob,

Thank you for contributing and supporting so actively the mesh development.
I understood the issues with TSF, so I stopped using it.

My aim is to approximate how much time the wireless channel to which the
card is tuned in, is busy. I use ieee80211_frame_duration for each
in/outcoming packet. I use the beacon triggers for periodically averaging
and storing samples.

I worked around that error assuming a fixed beacon time interval instead of
using TSF, which is pretty solid in a controlled environment. However, the
approximation would improve a lot counting the used time instead of
computing it afterwards.

Pursuing a similar purpose, somebody has already implemented that for
Atheros, using kernel time and reading registers. Here is the presentation
mail https://lists.ath9k.org/pipermail/ath9k-devel/2015-August/014141.html
and the project link https://github.com/thuehn/RegMon . The author is
Dr.-Ing. Thomas Hühn.

I plan to use it in the mid future.

Thank you,
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