Richard Revis wrote:
I have upgraded from 2.4.19 to 2.4.22-r4 on one machine and 2.6.1 on
another.
In both cases hdparm returns this:
elrsr-0 root # hdparm -d1 /dev/hda
/dev/hda:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)
Kernel options are (2.4.22):
x x <*> Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support x x
x x <*> Include IDE/ATA-2 DISK support x x
x x [*] Use multi-mode by default x x
x x <*> Include IDE/ATAPI CDROM support x x
x x [*] PCI IDE chipset support x x
x x [ ] Generic PCI IDE Chipset Support x x
x x [*] Sharing PCI IDE interrupts support x x
x x [*] Generic PCI bus-master DMA support x x
x x [ ] Boot off-board chipsets first support x x
x x [ ] Force enable legacy 2.0.X HOSTS to use DMA x x
x x [*] Use PCI DMA by default when available x x
x x [ ] Enable DMA only for disks
From the performance I am getting it definitely isn't enabled. Options on
the 2.6.1 kernel are set in a similar way.
I have Enable DMA only for disks set
Have you checked your bios settings are OK
David
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