From: Pankaj Raghav <p.raghav@xxxxxxxxxxx> Add block size > page size to ramfs as we support minimum folio order allocation in the page cache. The changes are very minimal, and this is also a nice way to stress test just the page cache changes for minimum folio order. I tested the changes from blocksize 4k to 2M with ltp's fsx on an x86 machine. I ran a basic perf test with dd as follows: $ mount ramfs -t ramfs -o blocksize=$bs /media/test/ $ dd if=/mnt/rand of="/media/test/rand" bs=2M count=2048 +------+----------+ | bs | BW(GB/s) | +------+----------+ | 4k | 1.7 | | 8k | 2.4 | | 16k | 3.2 | | 32k | 4.0 | | 64k | 4.5 | | 128k | 4.8 | | 256k | 5.3 | | 512k | 5.5 | | 1M | 5.6 | | 2M | 5.6 | +------+----------+ We get better performance for larger bs as we allocate larger folios instead of multiple smaller folios when there is no memory fragmentation and pressure. Pankaj Raghav (2): ramfs: add blocksize mount option ramfs: enable block size > page size fs/ramfs/inode.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) base-commit: 4d0326b60bb753627437fff0f76bf1525bcda422 -- 2.44.1
