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CONFIG_ATM_ZATM_EXACT_TS: Enable usec resolution timestamps

General informations

The Linux kernel configuration item CONFIG_ATM_ZATM_EXACT_TS:

Help text

The uPD98401 SAR chip supports a high-resolution timer (approx. 30 MHz) that is used for very accurate reception timestamps. Because that timer overflows after 140 seconds, and also to avoid timer drift, time measurements need to be periodically synchronized with the normal system time. Enabling this feature will add some general overhead for timer synchronization and also per-packet overhead for time conversion.

Hardware

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