Re: DMA ?
- From: Scientific <Scientific@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 8 Oct 2008 12:30:06 -0700
Paul,
After re-reading your post I must apologize for not acknowledging in my last
post the two links you provided at the end of your reply to this thread.
-S
"Paul" wrote:
Scientific wrote:.
Hello all,
I have an AMD Athlon 64 CPU and SATA motherboard with a separate PCI IDE
controller card installed. My BIOS doesn't recognize the controller card
(Ultra ATA 133 PCI) in the PCI slot, so I can't tell whether the drives (both
Seagate 750 GB)connected to the controller card are using DMA mode or not.
Also, Windows does not provide much info on those drives either. Does
anyone know how to determine if DMA is on/off on those drives?
-S
They use a pseudo-SCSI layer, for controllers other than the one
provided by the chipset. And that is why the information is hidden.
All the OS knows, is it sends a SCSI CDB to the driver, and the
driver converts the command into things it knows how to do on
the PCI chip.
The best way to tell if DMA is operating, is to benchmark the drives.
If you see 70MB/sec near the beginning of the disk, and 40MB/sec
near the end of the disk, that would be about right for media
(head to platter) limited transfers. If the card was really
in PIO mode, then you'd see a flat line at about 4MB/sec or
so. The PCI bus can manage 110-120MB/sec, so you would not
expect more than that (like if examining burst performance).
http://www.hdtune.com
http://www.simplisoftware.com/Public/index.php?request=HdTach
Paul
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