In the last episode (Mar 24), adp said:
I know that under Linux I can modify how the OS uses IDE drives using
hdparm. Is there an equivilent for FreeBSD? 'man tuning' seems to
indicate that there isn't anything and that I only need to worry
about whether I need to use softupdates. (It also mentions sysctl
values such as vfs.vmiodirenable, which seems enabled in 4.9 by
default.) I can see a need to tweak the parameters of how FreeBSD
uses my disks unless it already knows when to enable certain
features, for example 32-bit IO.
The old wd disk driver used to have a flag to enable 32-bit transfers,
but the ATA driver doesn't. I assume it always uses 32-bit. You can
set the transfer speed with the atacontrol command if the driver
didn't detect the right speed.
--
Dan Nelson
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