3 ms·
Maybe they discovered DMA transfer from SSD on PCIe being less bottlenecked than from DRAM, and fell into a rabbit hole from there. Switching hubs always has m
by numpad0 1y ago
Maybe they discovered DMA transfer from SSD on PCIe being less bottlenecked than from DRAM, and fell into a rabbit hole from there.
Switching hubs always has more bandwidths than a port that it is part of, and modern CPU resides on the PCIe equivalent of an uplink port. It makes sense that there would be situations where peripheral-to-peripheral DMAs would be faster than RAM-to-peripheral transfers to my low-paygrade brain.
- marcosdumay 1y agoYes, there exist situations where periferal-to-periferal is faster than RAM-to-periferal. But that doesn't make the disk access optimizations on your OS harmful, nor even useless. The disk-to-CPU access is best done through those optimizations for several reasons, one of them being that the author's conclusion isn't entirely supported by the data.