On Fri, 16 Mar 2018 21:51:48 +0000 Wei Wang <[email protected]> wrote:
> On Fri, Mar 16, 2018, 14:33 Andrew Morton <[email protected]> wrote: > > > On Fri, 16 Mar 2018 11:25:08 -0700 Wei Wang <[email protected]> wrote: > > > > > Change VM_MAX_READAHEAD value from the default 128KB to a configurable > > > value. This will allow the readahead window to grow to a maximum size > > > bigger than 128KB during boot, which could benefit to sequential read > > > throughput and thus boot performance. > > > > You can presently run ioctl(BLKRASET) against the block device? > > > > Yeah we are doing tuning in userland after init. But this is something we > thought could help in very early stage. > "thought" and "could" are rather weak! Some impressive performance numbers for real-world setups would help such a patch along.
