> The statement:
>
> > > BSD file systems turn off prefetch only if prefetched blocks remain
> > > unused.
>
> is false for FreeBSD afaik.
>
> FreeBSD tracks how often sequential access happens and will retry it
> as the file's access trend indicates. It can flip back and forth from
> readahead and non-readahead.
Yes, read my later posting describing the actual algorithm. Let me know
if it is wrong.
--
Bruce Momjian | http://www.op.net/~candle
pgman@candle.pha.pa.us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
