[mythtv-users] Enable DMA

Mitch Gore mitchell.gore at gmail.com
Fri Mar 23 01:07:24 UTC 2007


I am trying to enable DMA on my HD Myth box to increase performance.  It
works fine not but I have read so much about how DMA increases performance
so i figured I would give it a shot...

Here is my system config
Chipset - SiS
Western Digital HDD 500GB SATA

Heres some term output...

[root at Mitchell_mc myth]# /sbin/hdparm /dev/sda

 IO_support   =  0 (default 16-bit)
 readonly     =  0 (off)
 readahead    = 256 (on)
 geometry     = 60801/255/63, sectors = 976773168, start = 0
(I take it that DMA is not ON)

Trying to enable it....
[root at Mitchell_mc myth]# echo "/sbin/hdparm -d1 /dev/hda" >>

Still not working...
[root at Mitchell_mc myth]# /sbin/hdparm /dev/sda

 IO_support   =  0 (default 16-bit)
 readonly     =  0 (off)
 readahead    = 256 (on)
 geometry     = 60801/255/63, sectors = 976773168, start = 0

Thinking maybe i need to reboot for it to take effect but it gives me the
same thing.

Trying to get more info on if my drive does DMA...
[root at Mitchell_mc myth]# /sbin/hdparm -I /dev/sda


ATA device, with non-removable media
        Model Number:       WDC WD5000KS-60MNB0
        Serial Number:      WD-WCANXXXXXXXX
        Firmware Revision:  08.02E08
        Supported: 7 6 5 4
        Likely used: 7
        Logical         max     current
        cylinders       16383   16383
        heads           16      16
        sectors/track   63      63
        CHS current addressable sectors:   16514064
        LBA    user addressable sectors:  268435455
        LBA48  user addressable sectors:  976773168
        device size with M = 1024*1024:      476940 MBytes
        device size with M = 1000*1000:      500107 MBytes (500 GB)
        LBA, IORDY(can be disabled)
        Queue depth: 32
        Standby timer values: spec'd by Standard, with device specific
        R/W multiple sector transfer: Max = 16  Current = 16
        DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5
             Cycle time: min=120ns recommended=120ns
        PIO: pio0 pio1 pio2 pio3 pio4
             Cycle time: no flow control=120ns  IORDY flow control=120ns
        Enabled Supported:
           *    SMART feature set
           *    Power Management feature set
           *    Write cache
           *    Look-ahead
           *    WRITE_BUFFER command
           *    READ_BUFFER command
           *    NOP cmd
           *    DOWNLOAD_MICROCODE
                Power-Up In Standby feature set
           *    SET_FEATURES required to spinup after power up
           *    48-bit Address feature set
           *    Device Configuration Overlay feature set
           *    Mandatory FLUSH_CACHE
           *    FLUSH_CACHE_EXT
           *    SMART error logging
           *    SMART self-test
           *    General Purpose Logging feature set
           *    WRITE_{DMA|MULTIPLE}_FUA_EXT
           *    SATA-I signaling speed (1.5Gb/s)
           *    SATA-II signaling speed (3.0Gb/s)
           *    Native Command Queueing (NCQ)
           *    Phy event counters
                DMA Setup Auto-Activate optimization
                Device-initiated interface power management
           *    Software settings preservation
        Master password revision code = XXXX4
        146min for SECURITY ERASE UNIT.
Checksum: correct
[root at Mitchell_mc myth]#

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