lkml.org 
[lkml]   [2002]   [Mar]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Question about the ide related ioctl's BLK* in 2.5.7-pre1 kernel
Martin Dalecki wrote:
>
> Andrew Morton wrote:
> > Roberto Nibali wrote:
> >
> >>Hi,
> >>
> >>What for are BLKRAGET, BLKFRAGET and BLKSECTGET still needed?
> >>
> >
> > They got collaterally damaged in the IDE "cleanup". The patch at
> > http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.6/dallocbase-10-readahead.patch
> > resurrects them.
>
> This is WRONG. What I did here was just removal of unused code.
> They got obsoleted by the BIO infrastructure changes.

Actually, it's right.

In mid-February you asserted that the IDE readahead controls were
inoperative. You said:

> You are missing one simple thing: The removed values doen't control
> ANYTHING!

I asked:

> Please explain, in detail, why /proc/ide/hdX/settings:file_readhead
> no longer controls the readhead for that device. If this is
> the case in thr current 2.4 kernel, or if it will become the
> case if/when the IDE patches are merged then that needs fixing.
>

You didn't answer.

I tested them. They still worked.

I also said:

>
> Look, I agree that the current readhead controls are junk, and
> do not belong in the driver layer at all. All I'm saying is
> that we need per-device controls, for whatever scheme we end
> up using for readhead in 2.5. We really don't want to have
> the same sized readhead for CDROMs, floppies and super-duper
> RAID arrays.

Then the device-driver-based readahead controls got taken out.

I really do agree that it was a pile of crap. I've turned them
into a property of the request queue, which is a more appropriate
place for them.

In my current patch, the per-queue readahead parameter is controlled
via the old ioctls. Probably, these will be retired in favour of
/proc/iosched, when that turns up.

In the meantime, I *need* those tunables for ongoing development.

-
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:25    [W:0.101 / U:0.408 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site