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Years In The Making, Intel Timed I/O "TIO" Looks To Finally Land In Linux 6.15 (www.phoronix.com)
submitted 2 years ago by Sunshine@lemmy.ca to c/linux@programming.dev
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[-] FizzyOrange@programming.dev 7 points 2 years ago

Facebook and Google are the customers that use this feature.

Apparently. Does anyone know what they use it for?

[-] The_Decryptor@aussie.zone 6 points 2 years ago

I assume it'd be used for high quality time synchronisation, when you're running your own time servers.

So you've got a system synced to a GPS unit, and sends it's time to other devices on the LAN via PTP. This would help the system account for latency between the CPU and NIC, I assume.

[-] FizzyOrange@programming.dev 1 points 2 years ago

Yeah that makes sense.

[-] Morphit@feddit.uk 1 points 2 years ago

There's a talk here: https://www.youtube.com/watch?v=jMUMRNRkcMg but I'm not much clearer after scrubbing through some of the slides. It sounds like all GPIO pins on recent Intel chips support this Timed I/O functionality. I don't know if they could measure the timing of transactions to a NIC - I would think this is only for specialist hardware or testing. They mention using a logic analyser to compare the clocks of two systems after synchronisation.

[-] jaybone@lemmy.world 1 points 2 years ago

Also curious.

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this post was submitted on 24 Feb 2025
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