Nikita Danilov wrote:
>Hans Reiser writes: > > Horst von Brand wrote: > > > > > > > > > > >Funny that the "texbook algorithms" aren't used in real life. Wonder why... > > > > > > > > Try BSD. If the BSD book can be believed, they use"texbook algorithms". > >The "textbook" one-way elevator (as indeed exemplified by FreeBSD's >src/sys/kern/subr_disk.c:bioq_disksort()) has well-known weaknesses. For >example, > > dd if=/dev/zero of=FILE > >can easily monopolize device queue and starve accesses to the blocks >with low block numbers. > > > > > ;-) > >Nikita. > > > > Yes, and one can compensate for them fairly cleanly. I can't say more without the customer releasing the code first.
