[vox-tech] Poor SATA performance

[Ryan]

On Friday 15 April 2005 08:20 am, Ken Bloom kabloom-at-ucdavis.edu |lugod| 
wrote:
> Ryan Castellucci wrote:
> > I'm using 4 SATA hard drives on a SYBA SD-SATA-4P SATA card (Silicon
> > Image SIL3114A chipset) and I'm only getting 17MB/sec with hdparm -t on
> > the drives, and cpu utilization goes up to 100% while the test is going
> > on. I'm running this from knoppix 3.8, using 2.6.11.
> >
> > Anyone got any ideas? Does this SATA chipset just suck, or is something
> > set wrong?
>
> Is DMA enabled? Without DMA, every access has to go through the
> processor, which would explain the 100% CPU utilization.

How can I turn DMA on? They show up as SCSI devices, so hdparm -d1 does not 
work.....

-- 
Ryan Castellucci - http://ryanc.org/
GPG Key: http://ryanc.org/files/publickey.asc