Re: I request inclusion of reiser4 in the mainline kernel

Nikita Danilov
2005-09-20T18:26:54Z

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.