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    SubjectRe: 2.0.30 and the aic7xxx driver
    Date
    From
    --------
    > >>>>> ">" == Thomas Sailer <sailer@ife.ee.ethz.ch> writes:
    >
    > >> I kept having troubles with the aic7xxx driver in stock 2.0.30.
    >
    > Hi,
    > sorry for the long mail; I don't know what is really important.
    >
    > I didn't have any (noticeable) problems with stock 2.0.30...
    >
    > I ran 2.0.30+pre31-2+werner-22Jul+aic7xxx-Jul22.tgz on our main server
    > and had great troubles with scsi timeouts/aborts/resets.
    > Yesterday I put a third 4GB disk to this machine and tried
    > 2.0.30+pre31-2+bill-readahead+werner-01Aug+aic7xxx-2.1.42-July27.tgz.
    > (I don't know if I can use aic7xxx-2.1.42 with the 2.0.30+ kernel...)

    > I tried the new one aic7xxx-2.1.42-July27 with
    > CONFIG_SCSI_AIC7XXX=y
    > CONFIG_AIC7XXX_TAGGED_QUEUEING=y
    > CONFIG_AIC7XXX_CMDS_PER_LUN=16
    > CONFIG_AIC7XXX_PAGE_ENABLE=y
    > # CONFIG_AIC7XXX_USE_EXT_SCBRAM is not set
    > # CONFIG_AIC7XXX_PROC_STATS is not set
    > CONFIG_AIC7XXX_RESET_DELAY=15

    > Aug 4 17:18:12 : Vendor: Quantum Model: XP34300W Rev: 81HB
    > Aug 4 17:18:12 : Type: Direct-Access ANSI SCSI revision: 02
    > Aug 4 17:18:12 : Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
    > Aug 4 17:18:12 : scsi0: Target 1, channel A, now synchronous at 10.0MHz, offset 8.
    > Aug 4 17:18:12 : Vendor: Quantum Model: XP34300W Rev: 81HB
    > Aug 4 17:18:12 : Type: Direct-Access ANSI SCSI revision: 02
    > Aug 4 17:18:12 : Detected scsi disk sdb at scsi0, channel 0, id 1, lun 0
    > Aug 4 17:18:12 : scsi0: Target 4, channel A, now synchronous at 10.0MHz, offset 8.
    > Aug 4 17:18:12 : Vendor: QUANTUM Model: XP34550W Rev: LXY4
    > Aug 4 17:18:12 : Type: Direct-Access ANSI SCSI revision: 02

    The Quantum drives are known to have problems in how they handle tagged
    queueing commands (various firmwares on various drives have different
    problems, most related to the issue of releasing tagged commands as complete
    when they are still occupying resources on the drives controller). In any
    case, I usually don't recommend over 14 commands per lun on Quantum drives
    of any variety (where as my Seagate Barracuda drives are happy with 32 or 40
    if I want). I would try reducing the commands per lun value and check your
    results again.

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