Yes, Wide transfers were enabled.
> > > With this move I saw in improvement (hdparm -t) from 3
> > > to 8.4 (!) MB/second... Now I wonder what kind of bug
>
> Your PIO3/4 disk that had a recomended of 180ns for DMA was locked out.
> The previous location was a non-correctly allocated PDT.
> Skip the assigned PIO settings in the bios and use AUTO/AUTO
I normally use hdparm to set things -- I really was under
the impression that Linux took care of things (I never got
any messages about failed DMA mode or stuff like that).
> > > in the Linux I/O subsystem could hold performance back
> > > _that_ badly.
>
> Not a bug...........8.4 MB/second is a UDMA drive at DMA mode 2
> on an 430HX/VX/TX, and I bet the usable buffer is more.
So that is the maximum speed I can expect from my IDE subsystem?
Seems fair enough to me :)
> > Some motherboards use a crippled controller for ide1 in the belief
> > that it will only be used for cdroms.
>
> That is usually because of lazy BIOS writers/hackers (ass)(u)(me)
> "Nobody will use more than two hardrives"
:) I had 5, 3 IDE and 2 SCSI. And an ATAPI CDROM and a SCSI
optical. Now one of the IDE drives is removed (slow, 250MB)
and the others are repartitioned. With 4 disks your system
can run pretty smooth....
cheers,
Rik -- now completely used to dvorak kbd layout...
+-------------------------------------------------------------------+
| Linux memory management tour guide. H.H.vanRiel@phys.uu.nl |
| Scouting Vries cubscout leader. http://www.phys.uu.nl/~riel/ |
+-------------------------------------------------------------------+
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/