[CentOS] Slow IDE on GeForce 8200 board

[Alexander Georgiev]

2009/8/11 Ian Murray <murrayie at yahoo.co.uk>:
> In my haste for help, I stupidly hit reply and changed the subject which I
> thought was enough for a new message, not giving much thought for the
> threading, etc. So apologies for the hijack, although I would think it
> fairly obvious that it wasn't deliberate or obvious to me... or a big deal
> really. My mail doesn't thread.
>
> Some further info for those actually interested in helping, I forgot that
> the HD in question had an Ubuntu 8.10 install on it, so I fired that up and
> hdparm -t produced 56MB/Sec. So the issue is either kernel or config.

Check if ultradma and unmasq interrupts flags are set(both under
ubuntu and centos):

hdparm -u -d /dev/hda