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    Subject2.2.19pre14 VP3 + Quantum: dma on hangs
    Hello all,

    Using 2.2.19pre14 with:
    * software raid
    * raid1 readbalancing
    * i2c
    * lm_sensors
    * ipsec

    My drives are as follows:

    hda: QUANTUM FIREBALLP AS20.5, 19595MB w/1902kB Cache, CHS=2498/255/63
    hdc: QUANTUM FIREBALLP AS20.5, 19595MB w/1902kB Cache, CHS=39813/16/63
    hdd: IBM-DTTA-350840, 8063MB w/467kB Cache, CHS=16383/16/63
    hdb: ATAPI 4X CD-ROM drive, 256kB Cache

    [ Bios sees: HDA & HDC : udma5, HDD: udma2 ]

    And the mainboard related stuff in lspci:

    00:00.0 Host bridge: VIA Technologies, Inc. VT82C598 [Apollo MVP3] (rev 04)
    00:01.0 PCI bridge: VIA Technologies, Inc. VT82C598 [Apollo MVP3 AGP]
    00:07.0 ISA bridge: VIA Technologies, Inc. VT82C586/A/B PCI-to-ISA [Apollo VP] (rev 47)
    00:07.1 IDE interface: VIA Technologies, Inc. VT82C586 IDE [Apollo] (rev 06)
    00:07.2 USB Controller: VIA Technologies, Inc. VT82C586B USB (rev 02)
    00:07.3 Bridge: VIA Technologies, Inc. VT82C586B ACPI (rev 10)

    Now, if I turn on dma on hdd, and run hdparm benchmark, everything works
    fine.

    If I turn on dma with hdparm on hda or hdc, next disk activity will freeze
    the system completely. No keyboard interaction, not anything. Only reset
    helps.

    Also, if I disable UDMA in bios completely on hda and hdc, hdparm will
    work, but the speed is awful (only ~6 MB/s) even if DMA is enabled.

    The most relevant kernel settings are, I think:

    CONFIG_BLK_DEV_IDEDMA=y
    # CONFIG_BLK_DEV_OFFBOARD is not set
    CONFIG_IDEDMA_AUTO=y
    # CONFIG_BLK_DEV_OPTI621 is not set
    # CONFIG_BLK_DEV_ALI15X3 is not set
    # CONFIG_BLK_DEV_TRM290 is not set
    # CONFIG_BLK_DEV_NS87415 is not set
    CONFIG_BLK_DEV_VIA82C586=y
    # CONFIG_BLK_DEV_CMD646 is not set
    # CONFIG_BLK_DEV_CS5530 is not set
    # CONFIG_IDE_CHIPSETS is not set

    Any ideas?

    Please Cc:
    --
    Pekka Savola "Tell me of difficulties surmounted,
    Netcore Oy not those you stumble over and fall"
    Systems. Networks. Security. -- Robert Jordan: A Crown of Swords



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