Re: IDE DMA on 2.4.0test3-pre1 still broken?

[Camm Maguire]

Greetings!  Just to indicate that I seem to be having this problem
too.  One drive for each controller.  2.2.16+IDE. When the ide1 drive
is jumpered to hdc, 'timeout waiting on DMA -> lost interrupt'.  But
when jumpered for hdd, all is stable.  Does this shed any light?

Andre Hedrick <[e-mail]> writes:

> On Wed, 28 Jun 2000, Andreas Franck wrote:
> 
> > Not fully having understood the issue, I was careless and tried disabling the
> > write cache explicitly with "hdparm -W 0 /dev/hda", and ran the bonnie test
> > again. 
> > 
> > At the first investigation it looks good, at least all the messages go away. But
> > there are still phases during write in which the system becomes totally locked
> > (not even the mouse cursor can be moved) for a few seconds. This time NOT
> > followed by the stated messages. 
> > 
> > Re-Enabling write caching (with hdparm -W 1) caused all the messages to appear
> > again.
> 
> How old is the drive and have you ever gotten "Uncorrectable Error"?
> I rethought my earlier statements and they were wrong because I was
> thinking of another problem when answering yours.
> 
> The problem in reality is that the drive is taking to long to perform the
> DMAing with write-cache on/off.  I am wondering if your drive is out of
> slip sectors and is wildly doing head seeks to grab data from relocated
> sectors.
> 
> The only way I can think to test this without OEM vender specific calls,
> is to run "bonnie" in such a way that it would occur only if we hit a
> certain region of the media.
> 
> If you have partitioned up the drive as to give some zone tests, it my
> allow me to reduce the variables of the problem.  It may be that the drive
> is going to fail because of running out of relocation-slip sectors.
> This is only a WAG!
> 
> If it is only that you are having to hit the backup-sector blocks on the
> hidden part of the drive, the only solution is to allow for expanded
> timeouts.  I have to build a counter field that discrimates against the
> error type and then adjusts timers accordingly.
> 
> What partition are you running bonnie, and how many partitions are there?
> 
> Does the drive support SMART?
> 
> 
> 
> Andre Hedrick
> The Linux ATA/IDE guy
> 
> 
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-- 
Camm Maguire			     			[e-mail]
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