[7148] in linux-scsi channel archive
Re: Fixing the SCSI layer
daemon@ATHENA.MIT.EDU (tad-m2n@omoikane.co.jp)
Sun Sep 5 06:09:58 1999
Date: Sun, 05 Sep 1999 18:57:19 +0900
From: tad-m2n@omoikane.co.jp
To: alan@lxorguk.ukuu.org.uk
Cc: linux-kernel@vger.rutgers.edu, linux-scsi@vger.rutgers.edu
In-Reply-To: In your message of "Sun, 5 Sep 1999 01:44:33 +0100 (BST)"
<E11NQQ7-00075q-00@the-village.bc.nu>
Alan wrote:
> The code is too heavy weight. I See performance limits with the Symbios
> FC card too. In paticular the commands/second is very very limited.
In addtion to the performance, I feel that not-command-oriented layer is
required, in order to:
- implement FC/net layer on the top of mid-layer.
(this may include target mode driver)
- have better sg driver (ex, abort handling, etc)
I think that current command-oriented layer is not sufficient for control
all SCSI functionality.
As described in section 'Future Derections' of enhanced sg's manual,
I would also like to invest CAM driver in FreeBSD.
I am not thinking too much, but I imagine below is one of choice.
step1 : implement CAM layer.
step2 : make a 'wrapper' of low driver to the CAM layer.
this wrapped driver is limited in functionality.
step3 : implement CAM specific low and high layer and
implemnt net and sg target mode layer.
It is safer that new sd/sg layer uses different device files,
in order to leave current interfaces.
Does someone have this kind of curiousity?
I would like to see if my thought is acceptable by linux hackers.
If there is already such a plan, I hope to help it.
Thanks in advance.
--
Tadayoshi Ohkuma / tad@omoikane.co.jp
Omoikane Ltd. / http://www.omoikane.co.jp
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