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    SubjectRe: [PATCH] IDE TCQ #4
    On Thu, 18 Apr 2002 13:20:15 +0200
    Martin Dalecki <dalecki@evision-ventures.com> wrote:

    > Sebastian Droege wrote:
    > > On Wed, 17 Apr 2002 12:42:39 +0200
    > > Martin Dalecki <dalecki@evision-ventures.com> wrote:
    > >
    > >
    > >>>2.
    > >>>when I cat /proc/ide/ide1/hdc/identify I get 2 unexpected interrupts
    > >>>hdc and hdd are both cdrom drives (accessed via scsi-emulation if relevant)
    > >>
    > >> > but the problem shows up only with hdc
    > >>
    > >>Duh oh... This is actually a good hint. I will look after
    > >>this.
    > >>
    > >>
    > >>>and maybe a third problem ;)
    > >>>in /proc/ide/ide0/hda/tcq there is written:
    > >>>DMA status: not running
    > >>
    > >>This is harmless it just shows that there was no DMA transfer in flight the
    > >>time you have cat-ed this file.
    > >>
    > >>
    > >>>but DMA is explicitly enabled by hdparm and shows up in /proc/ide/ide0/hda/settings
    > >>>
    > >>>I'll do some more testings later the day
    > >>
    > > Hi again,
    > > after some playing with hdparm I found something bad :(
    > >
    > > ide_tcq_intr_timeout: timeout waiting for interrupt
    > > ide_tcq_intr_timeout: hwgroup not busy
    > > hda: invalidating pending queue
    > > ide_tcq_invalidate_queue: done
    > >
    > > and then... nothing works anymore -> total lockup of the IDE system
    > > This happens only (?) when I put hdparm -qa1 -qA1 -qc1 -qd1 -qm16 -qu1 -qW1 /dev/hda (the same with hdb) in my bootscripts
    > > When I start hdparm later everything works fine first, but after a while (and when I'm under X) the IDE system is crashed
    > >
    > > I have enabled following options:
    > > CONFIG_BLK_DEV_IDE_TCQ=y
    > > CONFIG_BLK_DEV_IDE_TCQ_FULL=y
    > > CONFIG_BLK_DEV_IDE_TCQ_DEFAULT=y
    > > CONFIG_BLK_DEV_IDE_TCQ_DEPTH=32
    > >
    > > I hope this helps somehow but I don't know what further informations I can provide
    > >
    > > BTW: I think we should create devfs entries for ide-scsi devices (because hdparm doesn't take scdX ;) )
    > >
    > > Bye
    >
    > I don't know whatever you have already tryed the recend patches for 2.5.8.
    > The problem in place is presumably fixed there (tough there are still
    > problems with ide-cd remaining which I'm working on right now.)
    >
    This problem exists also with your newest ide patches (I think 39 is the newest)
    And again: I don't see how ide-cd can cause this problem... I access my cdroms via scsi-emulation and ide-cd isn't compiled into the kernel

    Bye[unhandled content-type:application/pgp-signature]
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