Thu, 18 Dec 1997 08:50:06 -0500
Boris Seifert wrote:
> On Dec 17, 21:57, mlord wrote:
> > The 32-bit IO and multcount work only for PIO, not DMA.
> > On some drives (?), multcount might even slow down DMA,
> > though there is no evidence to support this theory.
> > Neither of these buys anything when DMA is used.
> How come it (seems to) work here ?
> [root@clito /root]# hdparm /dev/hda
> multcount = 0 (off)
> I/O support = 1 (32-bit) <---here
> unmaskirq = 0 (off)
> using_dma = 1 (on) <---and here
In this case, "32-bit" I/O is not actually "working".
Sure, it's enabled, but having zero effect..
The concept of multcount and "32-bit" I/O just plain
has nothing to do with DMA transfers. No positive effect.
The Linux IDE guy