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Deterministic timing #15

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nlsa opened this issue Oct 16, 2017 · 2 comments
Open

Deterministic timing #15

nlsa opened this issue Oct 16, 2017 · 2 comments

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@nlsa
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nlsa commented Oct 16, 2017

I have a task that requires frame injection with highly deterministic latency (jitter < 5us). About 1/4 of transmitted frames meet this criterion at 6MBps. The remainder fall in three bunches at approx. 8us intervals. At 54 MBps, a greater percentage meet the 5us requirement and the reminder continue to occur in bunches that are spaced about 8us. I would greatly appreciate suggestions of where to look for the cause of this periodic behavior.
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@nlsa
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nlsa commented Oct 16, 2017

forgot to include the context: # RTL8812AU/21AU and RTL8814AU linux driver with monitor mode and frame injection The master branch is based on https://github.com/ulli-kroll/rtl8821au branch v4.3.22-beta/rework. According to rtw_version.c the real driver version is 4.3.20.

@ulli-kroll
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Sorry for delay.
The main problem here is the broken wifi stack inside this driver.

I need some time to do a restart work on this driver ...

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