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Date: Fri, 10 Aug 2012 14:39:48 +0200
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Subject: Re: [Qemu-devel] virtio-scsi vs. virtio-blk
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To: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
Cc: Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel <qemu-devel@nongnu.org>, ronnie sahlberg <ronniesahlberg@gmail.com>

Il 10/08/2012 14:35, Stefan Priebe - Profihost AG ha scritto:
>>
>> One way to activate passthough is via scsi-generic:
>>      Example:
>>          -device lsi -device scsi-generic,drive=MyISCSI \
>>          -drive file=iscsi://10.1.1.125/iqn.ronnie.test/1,if=none,id=MyI
> 
> When i do this the guest system always uses the sym53c8xx kernel module.
> This results in 70 iops instead of 30000 iops. Is this really correct
> that it uses the very old sym53c8xx kernel module for this device?
> 
> used start command:
> http://pastebin.com/raw.php?i=23fkaQgc

Just replace lsi with virtio-scsi-pci again.  Also, using scsi-block
instead of scsi-generic should have better performance, but I'm not sure
Ronnie tested it with libiscsi.

Paolo