On Mon, 16 Jun 2025 15:28:56 +0900, Damien Le Moal wrote:
> For a device that does not advertize an optimal I/O size, the function
> blk_apply_bdi_limits() defaults to an initial setting of the ra_pages
> field of struct backing_dev_info to VM_READAHEAD_PAGES, that is, 128 KB.
>
> This low I/O size value is far from being optimal for hard-disk devices:
> when reading files from multiple contexts using buffered I/Os, the seek
> overhead between the small read commands generated to read-ahead
> multiple files will significantly limit the performance that can be
> achieved.
>
> [...]
Applied, thanks!
[1/1] block: Improve read ahead size for rotational devices
(no commit info)
Best regards,
--
Jens Axboe
