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Date: Thu, 31 Oct 2013 10:49:53 +0100
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] virtio-net performance on mach-virt.
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To: Giridhar Maruthy <giridhar.maruthy@linaro.org>
Cc: Peter Maydell <peter.maydell@linaro.org>, QEMU Developers <qemu-devel@nongnu.org>, Christoffer Dall <christoffer.dall@linaro.org>

Il 31/10/2013 04:32, Giridhar Maruthy ha scritto:
> On 30 October 2013 22:12, Paolo Bonzini <pbonzini@redhat.com> wrote:
>> Il 30/10/2013 15:40, Giridhar Maruthy ha scritto:
>>> Hi All,
>>>
>>> I tried to measure the network performance of guest (mach-virt) with
>>> virtio-net on an ARM host platform (Samsung exynos). The qemu version
>>> is 1.6.50.
>>>
>>> I found that with 1GbE NIC on the host, the host iperf gave a speed of
>>> 847Mbits/sec when a local dhcp server was used as a iperf server.
>>>
>>> But the guest gave a speed of 478Mbits/sec which is around 56% compared to host.
>>>
>>> What is the typical guest network efficiency compared to host with virtio-net?
>>> Any ideas would be helpful.
>>
>> Were you using vhost?
> 
> Yes, I did use vhost in the host kernel configuration and passed
> vhost=on in qemu, but there is no difference in the performance of
> guest.

What's your command line?

Paolo