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Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support
From: |
Paul Brook |
Subject: |
Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support |
Date: |
Wed, 29 Apr 2009 12:11:19 +0100 |
User-agent: |
KMail/1.9.9 |
On Wednesday 29 April 2009, Christoph Hellwig wrote:
> On Tue, Apr 28, 2009 at 11:37:01AM -0500, Anthony Liguori wrote:
> > Ah, excellent. I think that's a great thing to do. So do you think
> > virtio-scsi would deprecate virtio-blk?
>
> I don't think so. If you have an image format or a non-scsi blockdevice
> underneath virtio-block avoids the encoding into SCSI CDBs and back and
> should be faster.
Is this actually measurably faster, or just infinitesimally faster in theory?
I can maybe see that virtio-blk is slightly simpler for dumb drivers, though
even then a basic scsi host is pretty straightforward and I find it hard to
believe there's much real benefit.
Paul
- [Qemu-devel] [PATCH] virtio-blk: add SGI_IO passthru support, Christoph Hellwig, 2009/04/27
- Re: [Qemu-devel] [PATCH] virtio-blk: add SGI_IO passthru support, Avi Kivity, 2009/04/27
- [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Anthony Liguori, 2009/04/27
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Christoph Hellwig, 2009/04/28
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Anthony Liguori, 2009/04/28
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Christian Borntraeger, 2009/04/28
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Christoph Hellwig, 2009/04/29
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support,
Paul Brook <=
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Christian Borntraeger, 2009/04/29
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Paul Brook, 2009/04/29
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Christoph Hellwig, 2009/04/29
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Paul Brook, 2009/04/29
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Christoph Hellwig, 2009/04/30
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Paul Brook, 2009/04/30
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Javier Guerra, 2009/04/30
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Christian Borntraeger, 2009/04/28
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Christoph Hellwig, 2009/04/29
- Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support, Christian Borntraeger, 2009/04/29