Re: UDMA 100 / PIIX4 question

Tim Moore (timothymoore@bigfoot.com)
Mon, 19 Mar 2001 13:51:56 -0800

Mark Hahn wrote:
>
> > > > I have an IBM DTLA 307030 (ATA 100 / UDMA 5) on an 815e board (Asus CUSL2), which has a PIIX4 controller.
> > > > ...
> > > > My problem is that (according to hdparm -t), I never get a better transfer rate than approximately 15.8 Mb/sec....
> > >
> > > 15MB/s for hdparm is about right.
>
> it's definitely not right: this disk sustains around 35 MB/s.

The 815e does not use a PIIX4 chipset. My references were to PIIX4
chipsets.

> nonsequitur: the controller and disk are both quite capable of
> sustaining 20-35 MB/s (depending on zone.) here's hdparm output
> for a disk of the same rpm and density as the DTLA's:
>
> Timing buffer-cache reads: 128 MB in 1.07 seconds =119.63 MB/sec
> Timing buffered disk reads: 64 MB in 2.02 seconds = 31.68 MB/sec
>
> (maxtor dm+45, hpt366 controller)
> regards, mark hahn.

Again, this is not a PIIX4 chipset.

rgds,
tim.

--
-
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/