On Thu, 15 Dec 2005 12:31:55 +0000, Alan Cox wrote:


> > my SAMSUNG 250GB drive connected to HPT374 RAID bus > > controller
(SATA) is only working at UDMA 33.
> 
> 
> Force ata66 support on. See Documentation/ide.txt
> 

I tried to force ata66 but this doesn't work.
Drive still remains at UDMA 33.

But setting CONFIG_IDEDMA_PCI_AUTO to [ n ] (kernel 2.6.14.4) skips UDMA 33
detection and leads to this output:

hdk: 488397168 sectors (250059 MB) w/8192KiB Cache, CHS=30401/255/63 /*
before:  ,UDMA(33) */

Then after booting:

$hdparm -d 1 /dev/hdk

/dev/hdk:
 setting using_dma to 1 (on)
 using_dma    =  1 (on)

$hdparm -t /dev/hdk

/dev/hdk:
 Timing buffered disk reads:  162 MB in  3.02 seconds =  53.71 MB/sec

now this looks much better :)

By the way: Is there a trick setting DMA without CONFIG_IDEDMA_PCI_AUTO = [
y ] at boot time independent from init scripts?

regards,

Lukas

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