Really slow kvm internet speed

[Darkie]

Hey,
I don't know why, but i have a really slow internet connection speed inside of the kvm.
The host server's speed test:

Hosted by Tele2 (Frankfurt) [100.73 km]: 7.527 ms
Testing download speed........................................
Download: 880.21 Mbit/s
Testing upload speed..................................................
Upload: 445.37 Mbit/s

The kvm speed test:

Hosted by Tele2 (Frankfurt) [100.73 km]: 3.748 ms
Testing download speed........................................
Download: 79.98 Mbit/s
Testing upload speed..................................................
Upload: 38.98 Mbit/s

I've tested it multiple times, but its every time the same

The client's network interface is: Realtec RTL8139
I've tryed every card, but none of them is performing better

root@deb1:~# pveversion -v
proxmox-ve-2.6.32: 3.4-171 (running kernel: 2.6.32-43-pve)
pve-manager: 3.4-11 (running version: 3.4-11/6502936f)
pve-kernel-2.6.32-44-pve: 2.6.32-171
pve-kernel-2.6.32-41-pve: 2.6.32-164
pve-kernel-2.6.32-26-pve: 2.6.32-114
pve-kernel-2.6.32-43-pve: 2.6.32-166
lvm2: 2.02.98-pve4
clvm: 2.02.98-pve4
corosync-pve: 1.4.7-1
openais-pve: 1.1.4-3
libqb0: 0.11.1-2
redhat-cluster-pve: 3.2.0-2
resource-agents-pve: 3.9.2-4
fence-agents-pve: 4.0.10-3
pve-cluster: 3.0-19
qemu-server: 3.4-6
pve-firmware: 1.1-5
libpve-common-perl: 3.0-24
libpve-access-control: 3.0-16
libpve-storage-perl: 3.0-34
pve-libspice-server1: 0.12.4-3
vncterm: 1.1-8
vzctl: 4.0-1pve6
vzprocps: 2.0.11-2
vzquota: 3.1-2
pve-qemu-kvm: 2.2-21
ksm-control-daemon: 1.1-1
glusterfs-client: 3.5.2-1

 

[Darkie]

#Edit: I have applied the virtio network interface and followed this tut: https://wiki.debian.org/DebianKVMGuests
Its slightly better, but i still don't get the best performance

 

[wahmed]

Did you try the test from different KVMs ? Or is it slow only for one VM?

 

[tom]

#Edit: I have applied the virtio network interface and followed this tut: https://wiki.debian.org/DebianKVMGuests
Its slightly better, but i still don't get the best performance

which guest os do you run exactly? kernel version?

 

[Darkie]

Did you try the test from different KVMs ? Or is it slow only for one VM?

#UPDATE: Vm running debian with virtio adapter(always 300-400mbit): http://www.speedtest.net/result/5108728943.png
vm running Windows with windows e1000(always 100-200mbit) : http://www.speedtest.net/my-result/5108725569
The dedicated server speed(down always between 700-800mbit and upload always between 400 and 800): http://www.speedtest.net/result/5108735429.png

which guest os do you run exactly? kernel version?

What do you mean exactly? Where can i get this information in debian 7 64bit?

 

[tom]

...
What do you mean exactly? Where can i get this information in debian 7 64bit?

> uname -a

if you run default wheezy 3.2 kernel, please try the 3.16 kernel from wheezy-backports.

If I remember correctly, there were virtio improvements here.

 

[Darkie]

> uname -a

uname -a 3.16.0-0.bpo.4-amd64 #1 SMP Debian 3.16.7-ckt20-1+deb8u3~bpo70+1 (2016-01-19) x86_64 GNU/Linux
Ok, i've upgaded it now. Seems to perform a bit better
New problem: Without the upgrade, the server crashed unexpectly without any kind of log. I hope that this error wont occur anymore with that new version. I f not: does anyone why debian crashes with virtio and not with realtec ?
Thank you!