mru@users.sourceforge.net (Måns Rullgård) wrote:
>
> Mike Dresser <mdresser_l@windsormachine.com> writes:
>
> > Probably for reasons like that. For some reason, I can't set my ICH4
> > based controller(ASUS P4B533) and Quantum Fireball AS40.0 to more than
> > 255. Kernel is 2.4.21
>
> It appears that in 2.[56] kernels the unit for readahead is bytes,
> rather than sectors, as used in 2.4 kernels.
The ioctl which is used by
blockdev --setra
is still in 512-byte units.
There are other backdoors such as IDE-private /proc files which can be used
to set readahead. I'm not sure what units they use, and I don't know what
mechanism hdparm is using to diddle readahead.
Whatever it is, I suggest you ignore it and use /sbin/blockdev; it works
for all disk types.
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This archive was generated by hypermail 2b29 : Thu Jul 31 2003 - 22:00:51 EST