On Thu, Mar 20, 2025 at 04:41:11AM -0700, Luis Chamberlain wrote: > We've been constrained to a max single 512 KiB IO for a while now on x86_64. ... > It does beg a few questions: > > - How are we computing the new max single IO anyway? Are we really > bounded only by what devices support? > - Do we believe this is the step in the right direction? > - Is 2 MiB a sensible max block sector size limit for the next few years? > - What other considerations should we have? > - Do we want something more deterministic for large folios for direct IO? Is the 512KiB limit one that real programs actually hit? Would we see any benefit from increasing it? A high end NVMe device has a bandwidth limit around 10GB/s, so that's reached around 20k IOPS, which is almost laughably low.
