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Re: [Qemu-discuss] Using vhost scsi

From: Stefan Hajnoczi
Subject: Re: [Qemu-discuss] Using vhost scsi
Date: Wed, 27 Jul 2016 09:34:25 +0100
User-agent: Mutt/1.6.2 (2016-07-01)

On Tue, Jul 26, 2016 at 06:35:30PM +0000, Yehuda Yitschak wrote:
> Thanks a lot for the detailed answer 
> I managed to run virtio-scsi and i am benchmarking the performance
> just curios, does virtio-scsi deliver about the same performance as 
> vhost-scsi ? 

Both virtio-scsi and vhost-scsi support many different configurations.
If achieving the best performance is critical then you need to benchmark
them yourself.

> i was surprised to learn that vhost-scsi isn't widely used.
> i thought vhost-scsi should be the favored solution since it should be faster 
> but i guess the features you mentioned are also a significant factor.

Since virtio-scsi is QEMU userspace code it poses a lower security risk,
is easier to update in sync with QEMU itself, and has all the QEMU block
layer features.  The performance of vhost-scsi and virtio-scsi should be
about the same - they both do the same thing and there's no great
advantage to a kernel thread vs userspace thread (they use essentially
the same functionality inside the kernel).


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