[libvirt] [PATCH v6] network: Add network bandwidth support to ethernet interfaces

[Anirban Chakraborty]

On 11/19/14, 7:15 AM, "Vasiliy Tolstov" <v.tolstov at selfip.ru> wrote:

>2014-11-19 2:55 GMT+03:00 Anirban Chakraborty <abchak at juniper.net>:
>> Ethernet interfaces in libvirt currently do not support bandwidth
>>setting.
>> For example, following xml file for an interface will not apply these
>> settings to corresponding qdiscs.
>>
>>     <interface type="ethernet">
>>       <mac address="02:36:1d:18:2a:e4"/>
>>       <model type="virtio"/>
>>       <script path=""/>
>>       <target dev="tap361d182a-e4"/>
>>       <bandwidth>
>>         <inbound average="984" peak="1024" burst="64"/>
>>         <outbound average="2000" peak="2048" burst="128"/>
>>       </bandwidth>
>>     </interface>
>
>
>Hm. Now in libvirt 1.2.10 patch applied and compiled fine, but when
>i'm try to run server i get error like:
>2014-11-19 15:11:56.110+0000: 33405: error : virNetSocketReadWire:1571
>: End of file while reading data: Input/output error
>2014-11-19 15:11:57.240+0000: 33405: error : qemuMonitorIO:662 :
>internal error: End of file from monitor
>2014-11-19 15:11:57.753+0000: 33408: error : virCommandWait:2533 :
>internal error: Child process (tc qdisc add dev tap10339 root handle
>1: htb default 1) unexpected exit status 1: Cannot find device
>"tap10339"
>
>Relevant xml part is:
>        <interface type='ethernet'>
>          <mac address='{mac}'/>
>          <model type='virtio'/>
>          <alias name='net0'/>
>          <target dev='tap{name}'/>
>          <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
>function='0x0'/>
>          <rom bar='off'/>
>    <bandwidth>
>      <inbound average="40960" peak="51200"/>
>      <outbound average="40960" peak="51200"/>
>    </bandwidth>
> </interface>

The Œethernet¹ interface type assumes that you have an existing tap
device. Did you check if the tap device that it is complaining against
actually exists in the host?

Anirban