Re: [gentoo-user] DMA not working (2.4.22 and 2.6.1)

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I had the same problem, you may want to enable support for your IDE 
Chipset in your kernel, the specific one... not just general support.

Regards,

Martin

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.
Any suggestions greatly appreciated.

Thanks,

Richard

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