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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