On Fri, 20 Oct 2000, safemode wrote:
>
>
> That's what i was thinking, but 30MB/s seems to be quite an exaggeration.
> On my
> Intel Corporation 82371AB PIIX4 IDE (rev 01), ide chipset my master (10.2GB
Yes because that chipset is limited to Ultra33 rates
> maxtor 7200rpm UDMA66) drive i get ~15-16MB/s and on my slave (same
> interface, 20.1GB maxtor 7200rpm UDMA66), i get ~13MB/s. This goes against
> logic as the bigger the drive the faster the transferrate should be, and
> it's about half of your estimate of Michael's 40GB. Is this due to the
> slow disk access of 2.4.0-test10-preX ? Or am i experiencing a bug here?
There is something goofy in the block layer.
> Both drives are operating at UDMA33 mode (according to hdparm) and both
> drives are set to using 32bit, dma, 16 sector read ahead and 16 sector
> multi-access mode. I've posted results i've gotten from bonnie and
> bonnie++ before, in all cases, the performance seems to be lacking for the
> kind of hardware i have.
You go through a buffered OS.
>
> On Fri, 20 Oct 2000 14:58:41 Andre Hedrick wrote:
> >
> > Michael,
> >
> > Whatever card you are using, in you are getting that low I need to know
> > more info. That drive should cook at 30MB/sec.
>
>
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>
Andre Hedrick
The Linux ATA/IDE guy
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