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io_uring is faster than mmap

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283 points ghuntley | 1 comments | 04 Sep 25 22:01 UTC | HN request time: 0.202s | source
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modeless ◴[05 Sep 25 03:25 UTC] No.45134728[source]▶
Wait, PCIe bandwidth is higher than memory bandwidth now? That's bonkers, when did that happen? I haven't been keeping up.

Just looked at the i9-14900k and I guess it's true, but only if you add all the PCIe lanes together. I'm sure there are other chips where it's even more true. Crazy!

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1. rwmj ◴[05 Sep 25 09:04 UTC] No.45136511[source]▶
That's the promise (or requirement?) of CXL - have your memory managed centrally, servers access it over PCIe. https://en.wikipedia.org/wiki/Compute_Express_Link I wonder how many are actually using CXL. I haven't heard of any customers deploying it so far.