From: Jamie Lokier <jamie@shareable.org>
To: Christoph Hellwig <hch@lst.de>
Cc: kvm@vger.kernel.org, Rusty Russell <rusty@rustcorp.com.au>,
qemu-devel@nongnu.org,
Christian Borntraeger <borntraeger@de.ibm.com>,
Hannes Reinecke <hare@suse.de>,
Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support
Date: Fri, 1 May 2009 12:08:06 +0100 [thread overview]
Message-ID: <20090501110805.GA15311@shareable.org> (raw)
In-Reply-To: <20090501072449.GA21867@lst.de>
Christoph Hellwig wrote:
> On Thu, Apr 30, 2009 at 10:49:19PM +0100, Paul Brook wrote:
> > Only if you emulate a crufty old parallel scsi bus, and that's just silly.
> > One of the nice things about scsi is it separates the command set from the
> > transport layer. cf. USB mass-storage, SAS, SBP2(firewire), and probably
> > several others I've forgotten.
>
> It has nothing to do with an SPI bus. Everything that resembles a SAM
> architecture can have multiple LUs per targer, and multiple targers per
> initiator port, so we need all the complex queing code, and we need
> error handling and and and.
If you're using virtio-block to connect to lots of LUNs on lots of
targets (i.e. lots of block devices), don't you need similar queuing
code and error handling for all that too?
-- Jamie
next prev parent reply other threads:[~2009-05-01 11:08 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090427082606.GA32604@lst.de>
2009-04-27 8:29 ` [Qemu-devel] [PATCH] virtio-blk: add SGI_IO passthru support Christoph Hellwig
2009-04-27 9:15 ` Avi Kivity
2009-04-28 9:47 ` Christoph Hellwig
2009-04-27 14:36 ` [Qemu-devel] " Anthony Liguori
2009-04-28 9:51 ` Christoph Hellwig
2009-04-28 16:37 ` Anthony Liguori
2009-04-28 16:52 ` Christian Borntraeger
2009-04-29 10:48 ` Christoph Hellwig
2009-04-29 11:11 ` Paul Brook
2009-04-29 11:19 ` Christian Borntraeger
2009-04-29 11:29 ` Paul Brook
2009-04-29 11:21 ` Christoph Hellwig
2009-04-29 11:37 ` Paul Brook
2009-04-30 20:13 ` Christoph Hellwig
2009-04-30 20:55 ` Nicholas A. Bellinger
2009-04-30 21:49 ` Paul Brook
2009-04-30 21:56 ` Javier Guerra
2009-05-01 7:24 ` Christoph Hellwig
2009-05-01 11:08 ` Jamie Lokier [this message]
2009-05-01 14:28 ` Christoph Hellwig
2009-05-05 5:21 ` Rusty Russell
2009-04-28 19:09 ` Christian Borntraeger
2009-04-29 10:50 ` Christoph Hellwig
2009-04-29 11:07 ` Christian Borntraeger
2009-04-28 9:57 ` [Qemu-devel] [PATCH 2/2] virtio-blk: add SG_IO " Christoph Hellwig
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