Доброго дня суток, all.
Имеется такая проблема что при копировании большого файла, cpu взлетает до 100%, установка DMA режима не помогла. Подскажите что может быть и как ее побороть?

OS: Kubuntu 8.04, Suse 10.3
uname -a
Linux klinux-4 2.6.24-17-generic #1 SMP Thu May 1 14:31:33 UTC 2008 i686 GNU/Linux
4-ех процессорный Zeon.

hdparm /dev/sda

/dev/sda:
IO_support    =  0 (default)
16-bit)
HDIO_GET_UNMASKINTR failed: Inappropriate ioctl for device
HDIO_GET_DMA failed: Inappropriate ioctl for device
HDIO_GET_KEEPSETTINGS failed: Inappropriate ioctl for device
readonly      =  0 (off)
readahead     = 256 (on)
geometry      = 2434/255/63, sectors = 39102336, start = 0

hdparm -ITt /dev/sda

/dev/sda:

ATA device, with non-removable media
        Model Number:       WDC WD200BB-00DGA0                      
        Serial Number:      WD-WMADL1466860
        Firmware Revision:  05.03E05
Standards:
        Supported: 5 4 3
        Likely used: 6
Configuration:
        Logical         max     current
        cylinders       16383   16383
        heads           16      16
        sectors/track   63      63
        --
        CHS current addressable sectors:   16514064
        LBA    user addressable sectors:   39102336
        device size with M = 1024*1024:       19092 MBytes
        device size with M = 1000*1000:       20020 MBytes (20 GB)
Capabilities:
        LBA, IORDY(can be disabled)
        bytes avail on r/w long: 40
        Standby timer values: spec'd by Standard, with device specific minimum
        R/W multiple sector transfer: Max = 16  Current = 16
        Recommended acoustic management value: 128, current value: 254
        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
Commands/features:
        Enabled Supported:
           *    SMART feature set
                Security Mode feature set
           *    Power Management feature set
           *    Write cache
           *    Look-ahead
           *    Host Protected Area feature set
           *    WRITE_BUFFER command
           *    READ_BUFFER command
           *    DOWNLOAD_MICROCODE
                SET_MAX security extension
                Automatic Acoustic Management feature set
           *    Device Configuration Overlay feature set
           *    SMART error logging
           *    SMART self-test
Security:
                supported
        not     enabled
        not     locked
                frozen
        not     expired: security count
        not     supported: enhanced erase
HW reset results:
        CBLID- above Vih
        Device num = 0 determined by CSEL
Checksum: correct
Timing cached reads:   956 MB in  2.00 seconds = 477.48 MB/sec
Timing buffered disk reads:  140 MB in  3.01 seconds =  46.58 MB/sec

hdparm -d1 /dev/sda

/dev/sda:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Inappropriate ioctl for device
HDIO_GET_DMA failed: Inappropriate ioctl for device

Подскажите что можно было бы сделать или куда копать.