Messages in this thread | | | Subject | Can't enable DMA on my DVD in 2.6.1? | From | Greg Stark <> | Date | 17 Jan 2004 18:22:33 -0500 |
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Now I have a strange situation. I finally got the dvd-rom and cd burner devices to be recognized at all under 2.6.1 and now they work but DMA seems to be off.
The situation: Asus P4P800 motherboard with Intel ICH5 chipset in Enhanced mode "SATA Only". Using 2.6.1 with ata_piix handling the two SATA hard drives (sda, sdb) and ide-cdrom handling the PATA drive, cd burner, and dvd (hda, hdc, hdd).
When I play DVDs using Xine it seems to be barely able to keep up and occasionally stutters. Much as if DMA were disabled. And indeed I see it apparently isn't.
Moreoever when I try to turn it on I get EPERM. And I don't see the kernel option to use DMA by default any more. I suppose that went out with 2.6.1?
bash-2.05b# hdparm -v /dev/hdd
/dev/hdd: HDIO_GET_MULTCOUNT failed: Invalid argument IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 0 (off) keepsettings = 0 (off) readonly = 1 (on) readahead = 256 (on) HDIO_GETGEO failed: Invalid argument
bash-2.05b# hdparm -d 1 /dev/hdd
/dev/hdd: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off)
bash-2.05b# hdparm -I /dev/hdd
/dev/hdd:
ATAPI CD-ROM, with removable media Model Number: LG DVD-ROM DRD-8160B Serial Number: Firmware Revision: 1.01 Standards: Used: ATAPI for CD-ROMs, SFF-8020i, r2.5 Supported: CD-ROM ATAPI-2 Configuration: DRQ response: 50us. Packet size: 12 bytes Capabilities: LBA, IORDY(can be disabled) DMA: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2 udma0 udma1 *udma2 Cycle time: min=120ns recommended=150ns PIO: pio0 pio1 pio2 pio3 pio4 Cycle time: no flow control=227ns IORDY flow control=120ns
bash-2.05b# hdparm -i /dev/hdd
/dev/hdd:
Model=LG DVD-ROM DRD-8160B, FwRev=1.01, SerialNo= Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic } RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0 BuffType=unknown, BuffSize=0kB, MaxMultSect=0 (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0 IORDY=on/off, tPIO={min:227,w/IORDY:120}, tDMA={min:120,rec:150} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 *udma2 AdvancedPM=no
* signifies the current active mode
-- greg
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