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Date:      Thu, 11 Jul 2002 02:36:24 +0900 (JST)
From:      Tomoyuki Murakami <tomoyuki@pobox.com>
To:        hackers@FreeBSD.org
Subject:   Changes in kernel between 4.5-R to 4.6-R
Message-ID:  <20020711.023624.74756123.tomoyuki@pobox.com>

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Hi, hackers.


   I have a SCSI host adapter, called 'DMX3194UP' manufactured by
  Taiwan company (http://www.domex.com.tw/).
  I had privately adapted its device driver to FreeBSD 4.4.
    (http://www.c-wind.com/~tomo/i91u-newbus.tar.gz)
  and, have used with kernel 4.4-R and 4.5-R, driving IBM SCSI DISK.
  This driver worked well, without any pariculer problems
    for a while.
  When I up-grade the OS to 4.6-R, the driver becomes croaking
  'timed out' frequently. I do not have any debuggin tech, so,
   I could not make the points out. The only thing I know is that
  this simply means the driver's xxx_timeout routine was called,
  and I saw this never happens until some number of accesses to
  the DISK occur.

  Diffs between 4.5-R to 4.6-R src/sys was not helpful for me.
  What was changed in kernel which being likely to cause timeouts ?

  * this driver do not support DEVICE_POLLING. so, I did not
    made DEVICE_POLLING option enable.
  * this driver uses CAM I/F.


  Thanks,

  --- tomo.

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