From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Valdis.Kletnieks@vt.edu
Cc: tony osborne <tonyosborne_a@hotmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Main CPU- I/O CPU interaction
Date: Tue, 04 Jan 2005 22:03:45 +0000 [thread overview]
Message-ID: <1104857088.17176.27.camel@localhost.localdomain> (raw)
In-Reply-To: <200501032227.j03MRocl008354@turing-police.cc.vt.edu>
On Llu, 2005-01-03 at 22:27, Valdis.Kletnieks@vt.edu wrote:
> What sort of I/O device processor is (a) supported by Linux *and* (b) filesystem
> aware? Unless it meets both criteria, the main CPU(s) will still have to do
> all the work of block allocation, inode creation, and all the rest of that
> stuff.
NetApp 8)
The offloading file system stuff has been proposed and kicked around and
failed repeatedly in different circles. What has had some success is
offloading layout so that the I/O device thinks in terms of
handle = allocate(blocks, near_this, and_this, ....)
data = read(handle, offset, len)
write(handle, offset, len, data)
free(handle)
type API's, allowing the storage subsystem to do physical
mirror/relocation/HSM in private.
next prev parent reply other threads:[~2005-01-04 23:33 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-03 0:44 tony osborne
2005-01-03 16:12 ` Martin Waitz
2005-01-03 18:51 ` David Schwartz
2005-01-03 21:03 ` tony osborne
2005-01-03 21:49 ` David Schwartz
2005-01-03 22:27 ` Valdis.Kletnieks
2005-01-04 22:03 ` Alan Cox [this message]
2005-01-05 6:53 ` Tom Felker
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