linux-kernel - Re: Pe: [PATCH v5 1/3] virtio-scsi: first version

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Message-ID: <20120207111041.GA6674@redhat.com>
Date:	Tue, 7 Feb 2012 13:10:41 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Christian Hoff <christian.hoff@...ibm.com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	rusty@...tcorp.com.au, kvm@...r.kernel.org
Subject: Re: Pe: [PATCH v5 1/3] virtio-scsi: first version

On Tue, Feb 07, 2012 at 10:54:54AM +0100, Paolo Bonzini wrote:
> >Also, lun[1] = sc->device->id means that only 255 SCSI target IDs will be
> >supported. Think about bigger usage scenarios, such as FCP networks with
> >several hundred HBAs in the net. If you want to have the target ID<->HBA
> >mapping the same as on the guest as on the host, then 255 virtual target
> >IDs could be a limit.
> 
> I think you would hit other scalability limitations well before
> that.  I plan to give each target its own MSI-X interrupt, but there
> is no infinite supplies of those either.

virtio-pci generally lets guests share MSI-X vectors between queues,
why not allow this here?

-- 
MST
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