[7684] in linux-scsi channel archive
Re: How do I invoke a re-probe from kernel space?
daemon@ATHENA.MIT.EDU (mkwasigr@INTERCOPE.COM)
Mon Dec 13 11:09:10 1999
From: mkwasigr@INTERCOPE.COM
To: Eric Youngdale <eric@andante.org>
Cc: linux-scsi@vger.rutgers.edu
Message-ID: <C1256846.0057C40E.00@NS.INTERCOPE.COM>
Date: Mon, 13 Dec 1999 16:57:52 +0100
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Hi Eric,
you wrote:
> My guess is that the problem is that when you do an
> add-single-device that it calls down to the low-level driver to select
the
> queue depth again. The problem is (as the comment describes) that the
> low-level drivers may not expect being called to do this task a second
> time.
So, it appears to me that
a) the problem is in the aic7xxx low-level driver.
b) the problem will not be cured in the next 2.3 releases.
Allow me to repeat my previous questions:
1. Has anybody else experienced this loss of tagged command
queueing on "add-single-device"?
2. Is anybody working on a solution, especially for the aic7xxx driver?
The "add-single-device" is **VERY** handy. I want to use it to be able to
switch my SCSI DAT tape on and off without the need to reboot. But if I
lose
the queue depth for my SCSI disks, I fear the perfomance penalty... :-(
Mit freundlichen Gruessen / best regards
Michael Kwasigroch
FaxPlus/Open Development
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