- If you run "make" in the papers/IBIC2013 directory you'll get this paper:
https://cds.cern.ch/record/1743073/files/thbl2.pdf
It's quite interesting - this isn't ethernet as we know it. Instead of each NIC using its own free-running clock, all the physical layers are sync'ed to each other at layer 1. (note that gigabit ethernet, which is what it uses, sends data at all times - when idle it sends the idle symbol)
- Haven't looked into this in depth but sub-nanosecond sync for systems up to 10km apart is interesting since 10km is about 33 light microseconds. There is some trickery going on.
by zamadatix
1 subcomments
- Some may find https://gitlab.com/ohwr/project/white-rabbit/-/wikis/home an easier starting point. Particularly the "Synchronization" page.
In short, it's about giving PTP and SyncE some extra smarts.
- If this wasn't CERN tech I would think I was being taken for a ride. Conventional wisdom is that distributed consensus is not possible at this kind of performance, does anyone have a sense for how this is different and how my mental model is wrong?
- Haven't dug in on the technicals, but this is coming out of CERN, it looks like - and in that light, the links to "We're hiring" on that page almost feel like a flex...
- What is significance of this?
by andrewstuart
0 subcomment
- If your system depends on highly accurate time maybe you’re doing it wrong?
Of course no doubt there’s some requirements that cannot avoid that requirement.
But for the most part needing synchronized time is just going to be a forever problem isn’t it?
by 9VMuzdNtfPK
0 subcomment
- [dead]
by LowLevelKernel
1 subcomments
- Not on GitHub?
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