10Gbit/s in VM

[Irek Zayniev]

Hello!
Did someone get success to get 10Gbit/s inside VM?
I'm using HP DL 580 G7 with 10Gbit/s NetXen interfaces. Proxmox - 5.2.
These interfaces are in the bridge which is in VM throw virtio interface.
From host to host there is 10Gbit/s, from 1 VM to another in the same node there is10Gbit/s, from host to the VM there is 10Gbit/s. But there is about 1.5Gbit/s from VM on one host to another VM in another host.

 

[janos]

Hi,

Yes, with openvswitch and proper sysctl configs (large tcp windows, etc, you can find many tutorials on internet), 9k mtu its working.

 

[Irek Zayniev]

@janos, can you please point me into one of them. I can't find something workable.

 

[janos]

Hello,

https://access.redhat.com/sites/default/files/attachments/20150325_network_performance_tuning.pdf
https://darksideclouds.wordpress.com/2016/10/10/tuning-10gb-nics-highway-to-hell/
http://fibrevillage.com/sysadmin/91-tcp-performance-tuning-10g-nic-with-high-rtt-in-linux

 

[Irek Zayniev]

@janos thank you!

 

[Irek Zayniev]

I did try with MTU 9000 on nodes, on bridges (vmbr) and on VM interface.
It is better now from VM to host - 14.7 Gbit/sec, from VM to VM on the same host - 11.2 Gbit/sec, between host and VM on another host 6.0Gbit/sec.
But between VM on one host and VM on another, it is just 5.6Gbit/sec.