Running up MAXPHYS will not have the same effect on DragonFly as it does on FreeBSD, for a variety of reasons but mostly due to better optimized read-ahead. (That is to say, DragonFly should work better out of the box).
Sam On Tue, May 13, 2014 at 3:02 AM, Wojciech Puchar < [email protected]> wrote: > (x86_64/amd64) by default. >> >> I experimented for a while with the ahci driver; bigger values helped to >> increase linear (dd) performance by up to 20% with fast SSDs but it was >> unclear >> at the time if it would have improved regular filesystem operations. >> > > it should when performing parallel reads/writes on multiple large files. > prevents seeking. in freebsd it makes enormous difference. > > > >> Even though all storage drivers compile fine with bigger MAXPHYS values >> it's >> also possible some will have issues at runtime. >> >> -- >> Francois Tigeot >> >> >>
