[Users] Abysmal network performance inside hypervisor node

Markus Stockhausen stockhausen at collogia.de
Wed Dec 11 13:30:56 UTC 2013

> Von: sander.grendelman at gmail.com [sander.grendelman at gmail.com]" 
> 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 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  netmask  broadcast
        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

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