From mboxrd@z Thu Jan  1 00:00:00 1970
From: Juergen Gross <jgross@suse.com>
Subject: Re: pvUSB backend performance
Date: Thu, 25 Jun 2015 12:41:51 +0200
Message-ID: <558BDAEF.8090601@suse.com>
References: <558A9D2A.2020006@suse.com> <1435222424.25170.142.camel@citrix.com>
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To: Dario Faggioli <dario.faggioli@citrix.com>
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On 06/25/2015 10:53 AM, Dario Faggioli wrote:
> On Wed, 2015-06-24 at 14:06 +0200, 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?
>>
> 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?

No specific knowledge, sorry.


Juergen