Re: [Xen-devel] pvUSB backend performance

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 24/06/15 13:06, Juergen Gross wrote:
> Hi,
> 
> my qemu integrated pvUSB backend is now running stable enough to do
> some basic performance measurements. I've passed a memory-stick with
> about 90MB of data on it to a pv-domU. Then I read all the data on
> it with tar and looked how long this would take (elapsed time):
> 
> in dom0:                     5.2s
> in domU with kernel backend: 6.1s
> in domU with qemu backend:   8.2s
> 
> So the qemu backend is about 30% slower than the kernel backend. Is
> this acceptable?

Yes?  Maybe? I assume you're adding this backend for a reason, so is it
good enough for your workloads?

IMO, It seems a reasonable trade off to not have a bunch of kernel code.

David

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