By rwmj
For 32 bit ARM, it seems to be shortcuts in the SoC design. There exist some designs with real SATA (eg. Cubietruck) but those have poor CPUs (A7), and there exist many designs with SATA-via-USB which is never going to be fast. Also micro SD cards have abysmal performance for the sort of random I/O that operating system root filesystems have.
Luckily the situation in 64 bit ARM server land is much better. The APM Mustang and AMD designs have a combination of fast cores and properly engineered I/O subsystems.
See more about this article by clicking the link here: https://news.ycombinator.com/item?id=10115818
rwmj comments on "Samsung Exynos Octa-Core servers"
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