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    SubjectServerworks CSB5 IDE-DMA Problem (2.4 and 2.6)
    Hello!

    we have a bunch of IBM x305 here which are entrylevel 1HE servers based
    on a Serverworks CSB5 chipset.
    One of those has 2 120GB IDE disks in a software RAID1 and the main
    userspace-application is a heavly (mostly insert/update) used
    postgresql-database. The database generates a lot of sustained
    IO-traffic and after some minutes (depends on the load - sometimes it
    even works for one or two hours) the kernel generates the following
    messages(2.4.22 and 2.6.0-test6 behave almost identically -
    error-messages are from 2.6.0-test6):


    hdc: dma_timer_expiry: dma status == 0x20
    hdc: DMA timeout retry
    hdc: timeout waiting for DMA
    hdc: status timeout: status=0xd0 { Busy }

    hdc: drive not ready for command
    ide1: reset: success
    hdc: dma_timer_expiry: dma status == 0x20
    hdc: DMA timeout retry
    hdc: timeout waiting for DMA
    hdc: status timeout: status=0xd0 { Busy }

    hdc: drive not ready for command
    ide1: reset: success
    hdc: dma_timer_expiry: dma status == 0x20
    hdc: DMA timeout retry
    hdc: timeout waiting for DMA
    hdc: status timeout: status=0xd0 { Busy }

    hdc: drive not ready for command
    ide1: reset: success
    hdc: dma_timer_expiry: dma status == 0x20
    hdc: DMA timeout retry
    hdc: timeout waiting for DMA
    hdc: status timeout: status=0xd0 { Busy }

    hdc: drive not ready for command
    ide1: reset: success
    hda: dma_timer_expiry: dma status == 0x60
    hda: DMA timeout retry
    hda: timeout waiting for DMA
    hda: status timeout: status=0xd0 { Busy }

    hdb: DMA disabled
    hda: drive not ready for command
    ide0: reset: success
    blk: queue dfdee200, I/O limit 4095Mb (mask 0xffffffff)
    hda: dma_timer_expiry: dma status == 0x20
    hda: DMA timeout retry
    hda: timeout waiting for DMA
    hda: status timeout: status=0xd0 { Busy }

    hda: drive not ready for command
    ide0: reset: success
    hda: dma_timer_expiry: dma status == 0x20
    hda: DMA timeout retry
    hda: timeout waiting for DMA
    hda: status timeout: status=0xd0 { Busy }

    hda: drive not ready for command
    ide0: reset: success


    after one of this events DMA on one of the disks (either hdc or hda)
    gets disabled and the maschine is heavily overloaded and the database
    cannot keep up any more with the incoming load of database-updates.
    It's also worth mentioning that the kernel reports a "DMA disabled" only
    for hdb which is the internal cd-drive and completely unused.

    I do know that Serverworks IDE has been flaky (especially with the CSB4)
    in the past but I thought this had been fixed in newer chipset-revisions
    - is there anything I can do to solve this problem?

    dmesg of the machine in question can be found at
    http://www.kaltenbrunner.cc/files/dmesg.txt



    many thanks

    Stefan Kaltenbrunner

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