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From: "Tony Battersby" <tonyb@cybernetics.com>
To: 'James Bottomley' <James.Bottomley@SteelEye.com>
Cc: 'Douglas Gilbert' <dougg@torque.net>,
	'Mike Christie' <michaelc@cs.wisc.edu>,
	'device-mapper development' <dm-devel@redhat.com>,
	'linux-scsi' <linux-scsi@vger.kernel.org>,
	'Jens Axboe' <axboe@suse.de>,
	LIRANS@il.ibm.com
Subject: RE: [PATCH RFC 0/4] use scatter lists for all blockpc	requests	and simplify hw handlers
Date: Tue, 7 Jun 2005 14:38:29 -0400	[thread overview]
Message-ID: <007e01c56b90$1a09a6f0$e0019d89@cybernetics.com> (raw)
In-Reply-To: <1118162097.4813.38.camel@mulgrave>

> > My company (Cybernetics) sells several products that run embedded
Linux
> > which use the userspace scatter-gather capability of the SG driver.
> > They are still running the 2.4 kernel series, but we will probably
> > switch to 2.6 at some point.
>
> What do they actually use it for?  As in why is the data scattered
even
> in the virtual address space?

One of our products is a RAID-like controller for SCSI tape drives.
Parallel SCSI or iSCSI in via a target-mode SCSI driver and parallel
SCSI, iSCSI, or FC out via the SG driver, with various functions in
between for data buffering, emulation, striping, mirroring, etc.  The
program that controls everything has a complex internal buffering scheme
that uses userspace scatter-gather for the main read/write I/O path to
the tape drives.

Anthony J. Battersby
Cybernetics


  reply	other threads:[~2005-06-07 18:38 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-06-04  1:19 [PATCH RFC 0/4] use scatter lists for all block pc requests and simplify hw handlers Mike Christie
2005-06-04 16:07 ` James Bottomley
2005-06-05  7:15   ` Mike Christie
2005-06-05  9:41     ` [dm-devel] " christophe varoqui
2005-06-06 13:31       ` Lars Marowsky-Bree
2005-06-07  0:04         ` Michael Christie
2005-06-07  7:01           ` [dm-devel] " Lars Marowsky-Bree
2005-06-05 14:40     ` James Bottomley
2005-06-05 19:11       ` James Bottomley
2005-06-06  5:43         ` Douglas Gilbert
2005-06-06 14:19           ` James Bottomley
2005-06-07 13:08             ` Douglas Gilbert
2005-06-07 13:34               ` Tony Battersby
2005-06-07 16:34                 ` James Bottomley
2005-06-07 18:38                   ` Tony Battersby [this message]
2005-06-07 18:43                     ` [PATCH RFC 0/4] use scatter lists for all blockpc " Jens Axboe
2005-06-07 15:59               ` [PATCH RFC 0/4] use scatter lists for all block pc " James Bottomley
2005-06-07 18:07                 ` Jens Axboe
2005-06-07 19:26                   ` James Bottomley
2005-06-08  7:09                     ` Jens Axboe
2005-06-06 19:02     ` Patrick Mansfield
2005-06-07 15:26       ` Michael Christie
2005-06-07 18:23         ` Patrick Mansfield
2005-06-08 15:41           ` Mike Christie
2005-06-09  0:08             ` Patrick Mansfield
2005-06-09  6:18               ` Jens Axboe
2005-06-09 11:51                 ` James Bottomley
2005-06-09 11:54                   ` Jens Axboe
2005-06-07 12:10   ` Christoph Hellwig
2005-06-07 12:20     ` James Bottomley
2005-06-07 15:36       ` Michael Christie
2005-06-07 15:45         ` [dm-devel] " Michael Christie
2005-06-07 16:26           ` Kai Makisara
2005-06-07 19:23             ` James Bottomley
2005-06-07 18:09         ` Jens Axboe
2005-06-08 12:46           ` Mike Christie
2005-06-07 18:07 ` Jens Axboe
2005-06-07 19:38   ` James Bottomley
2005-06-08  3:00     ` Douglas Gilbert
2005-06-08 12:59       ` James Bottomley
2005-06-08 14:50         ` Luben Tuikov

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