> On 2017-04-05 17:24, Theo de Raadt wrote: > >> "ls -l /dev/rsd0c; ls -l /dev/sd0c" shows that sd0c is a block device > >> and rsd0c is a character device, and mmap's man page says that > >> "character special files" are OK. > > > > The manual pages will never list all restrictions. > > /dev/sd* delivers ~120MB/sec globally, whereas /dev/rsd* delivers > ~575MB/sec, sustainedly in my tests, likely due to lots of the IO > subsystem being bypassed on /dev/rsd* access, as discussed in the misc@ > ML thread with David Gwyne. > > So presently higher-speed access is restricted to read()/write() - > noted.
So what?
