I urge you to read the papers and articles I linked at the end if any of this is your jam. They are incredible bangers all of them.
6r17 · 1h ago
Thanks for sharing this !
kvemkon · 26m ago
> 256 KB vs 512 B
> A counter argument might be that this drives massive read amplification,
For that, one need to know the true minimal block size SSD controller is able to physically read from flash. Asking for less than this wouldn't avoid the amplification.
jeffbee · 23m ago
Fun post. One unmentioned parameter is the LBA format being used. Most devices come from the factory configured for 512B, so you can boot NetWare or some other dumb compatibility concern. But there isn't a workload from this century where this makes sense, so it pays to explore the performance impact of the LBA formats your device offers. Using a larger one can mean your device manages io backlogs more efficiently.
Indeed, 128 KB is a well-known long lasted optimal buffer size [1], [2].
Until it has been increased to 256 KB recently (07.04.2024) [3].
[1] https://github.com/MidnightCommander/mc/commit/e7c01c7781dcd...
[2] https://github.com/MidnightCommander/mc/issues/2193
[3] https://github.com/MidnightCommander/mc/commit/933b111a5dc7d...
> A counter argument might be that this drives massive read amplification,
For that, one need to know the true minimal block size SSD controller is able to physically read from flash. Asking for less than this wouldn't avoid the amplification.