[Users] Abysmal network performance inside hypervisor node

[Sander Grendelman]

I'm just wondering if the tested interfaces are bridged because I've
seen some issues with
network througput and bridged interfaces on my local system (F19).

Basically, if an IP is configured on the bridge itself ( in oVirt this
is the case if the network
is configured as a VM network ) latency goes up and throughput goes down.

Can you rule this one out by using an unbridged interface?

On Wed, Dec 11, 2013 at 2:30 PM, Markus Stockhausen
<stockhausen at collogia.de> wrote:
>> Von: sander.grendelman at gmail.com [sander.grendelman at gmail.com]&quot;
>> Gesendet: Mittwoch, 11. Dezember 2013 13:27
>> An: Markus Stockhausen
>> Cc: ovirt-users
>> Betreff: Re: [Users] Abysmal network performance inside hypervisor node
>>
>> Could this have something to do with the bridging config used by vdsm?
>>
>> @Markus: what does your network config look like?
>> And what is the interface you use to access the NFS store?
>
> We have an IB IPoIB network for storage. Thats why you see a throughput
> at 400 MB/sec. For a cross check I mounted the NFS share through the
> ovirtmgmt interface (our normal trusted internal network) on a 1GBit
> Intel network card.
>
> The throughput is exatly the same - throttled at round about 16MB/sec:
>
> Maybe that is no problem at all for the VMs. But in my case it would be helpful
> to know the switch to temporarily flood the channels for fast migration.
>
> [root at colovn01 _ISOs]# df .
> Dateisystem               1K-blocks    Benutzt  Verfügbar Verw% Eingehängt auf
> 192.168.10.30:/var/nas1 11611801600 9618833408 1992968192   83% /mnt
> [root at colovn01 _ISOs]# dd if=SLES-11-DVD-x86_64-GM-DVD1.iso of=/dev/null
> 5148409+0 Datensätze ein
> 5148408+0 Datensätze aus
> 2635984896 Bytes (2,6 GB) kopiert, 157,247 s, 16,8 MB/s
>
> [root at colovn01 _ISOs]# ifconfig ovirtmgmt
> ovirtmgmt: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>         inet 192.168.10.51  netmask 255.255.255.0  broadcast 192.168.10.255
>         inet6 fe80::230:48ff:fed7:9ec4  prefixlen 64  scopeid 0x20<link>
>         ether 00:30:48:d7:9e:c4  txqueuelen 0  (Ethernet)
>         RX packets 203382  bytes 2673889310 (2.4 GiB)
>         RX errors 0  dropped 2092  overruns 0  frame 0
>         TX packets 160826  bytes 19946957 (19.0 MiB)
>         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>
> Markus