Hi Volodymyr, I can only answer the second part of your question since I have never tried to use ptp4l to build a transparent clock …
Concerning the NICs, I have used the following with ptp4l: * Intel X710-T4 (other versions that use the same ASIC should work as well) * Intel i350-T2V4 * Broadcom BMC5720-2P (and in general any NIC based on BMC 5719 or 5720 ASIC) There are other NICs which I only know by Datasheet: * Mellanox ConnectX-6 * Chelsio T520-BT Depending on your needs, the Intel XXV710-DA2T may be interesting, since it has a high-quality oscillator and SMA connectors for PPS output. cheers, Christian Von: Volodymyr Litovka <d...@funlab.cc> Gesendet: Freitag, 30. Juli 2021 16:44 An: linuxptp-users@lists.sourceforge.net Betreff: [Linuxptp-users] newbie question Hi colleagues, my previous experience is in the hardware world :-) so sorry for the probably dummy question. Do I understand correctly, that when used in transparent mode, ptp4l **modifies** (adds the residence time into the correction field) all transit PtP packets between interfaces, mentioned in "-i" options and, thus, it is possible to use transit linux-based node as a transparent clock between boundary parties (master and slave)? And the second question: is there list of NICs which support ptp hardware offload? I know some Mellanox (e.g. ConnectX-4) and Intel (e.g. X710) cards support it, but which ones exactly? Is there a way to find the list except exploring datasheets? Thank you! -- Volodymyr Litovka "Vision without Execution is Hallucination." -- Thomas Edison
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