From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dario Faggioli <dario.faggioli@citrix.com>
Subject: Re: pvUSB backend performance
Date: Thu, 25 Jun 2015 10:53:44 +0200
Message-ID: <1435222424.25170.142.camel@citrix.com>
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To: Juergen Gross <jgross@suse.com>
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On Wed, 2015-06-24 at 14:06 +0200, Juergen Gross wrote:
> Hi,
>=20
> 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):
>=20
> in dom0:                     5.2s
> in domU with kernel backend: 6.1s
> in domU with qemu backend:   8.2s
>=20
> So the qemu backend is about 30% slower than the kernel backend. Is
> this acceptable?
>=20
If I can ask (I know nothing about USB, let alone pvUSB! :-O), and if
you happen to know, what's the situation of other hypervisors, in term
both of support and performance?

Regards,
Dario

--=20
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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