VM network performance

[RRJ]

Hi,

VM to other servers in same network performance is around 30-50 MB /sec
VM to internet performance is strictly 10 MB /s


So inside one subnet gigabit network is working, but outside is not.
Using virtio drivers.

Any ideas?

 

[m.ardito]

only obvious ones:
- are you sure the internet speed should definitely be higher?
- can you compare the internet speed from what you get on other servers?
- there is any other possible bottleneck (eg: a proxy, qos) for that vm IP?

Marco

 

[RRJ]

I get 1 gbps from the VE host where this VM is running from.
Same problem from VM to other internal network segments.
So the 1 gbps is working within the same segment only. I wish I could know the reason why.

 

[m.ardito]

sorry, just to understand: you expect a 1GB/s internet connection? I don't know how internet rates are in Estonia, 1gb internet connection should be really expensive... my whole company runs 50+ pc on lan + internal mail & web servers on 10MB/s fiber...

anyway, if that speed is doable, if no explicit limit is there, neither in the vm sw/hw nor in the internet routing... you could try a different vm eth "hardware", eg: intel e1000. If you get better speeds, it must be something due to virtio, perhaps in the vm.

Marco

 

[RRJ]

I'll try.
We run own ASNUM with 2+ gbps IPT connection and 10gbps backbone, so 1 gbps is not a problem
I expect to get 1gps at least between internal networks. In the same subnet there is gigabit doable. No limits for that subnet where this VM is (checked twice). From Internet I expect to get at least as much as pve host gets.

I'll keep on testing. Seems like virtio bug atm.

 

[kobuki]

I don't know if it helps but I can easily saturate the 1G link of my home NAS from my Win7 here which sits in a KVM VM, using virtio. PVE host is Intel desktop HW, DQ67SW, Intel LOM. 2 cores are assigned to the VM and it also uses VT-d to pass through a HBA for ZFS (ZoL) inside the VM. The 2 VCPUs are not even sweating. The link passes 2 switches on the way to the server. If nothing else, it shows that it's doable. OS is Debian 7.6.

 

[wahmed]

Hi,

VM to other servers in same network performance is around 30-50 MB /sec
VM to internet performance is strictly 10 MB /s


So inside one subnet gigabit network is working, but outside is not.
Using virtio drivers.

How are you testing the external Internet performance?

 

[RRJ]

symmcom
For testing I use wget and iperf.
kobuki
Thanks! I'll try to find out, where is the missconfiguration in my setup.