On Thu, Mar 20, 2025 at 02:47:22PM +0100, Daniel Gomez wrote: > On Thu, Mar 20, 2025 at 04:41:11AM +0100, Luis Chamberlain wrote: > > We've been constrained to a max single 512 KiB IO for a while now on x86_64. > > This is due to the number of DMA segments and the segment size. With LBS the > > segments can be much bigger without using huge pages, and so on a 64 KiB > > block size filesystem you can now see 2 MiB IOs when using buffered IO. > > Actually up to 8 MiB I/O with 64k filesystem block size with buffered I/O > as we can describe up to 128 segments at 64k size. Block layer segments are in no way limited to the logical block size.
