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Date: Thu, 18 Apr 2002 14:26:36 +0200
From: Sebastian Droege <sebastian.droege@gmx.de>
To: Martin Dalecki <dalecki@evision-ventures.com>
Cc: axboe@suse.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] IDE TCQ #4
Message-Id: <20020418142636.10201a7f.sebastian.droege@gmx.de>
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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
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