[pve-devel] win8r2 virtio net problems

[Alexandre DERUMIER]

I have done test with win2012 + virtio-net, no tuning, last virtio driver.

on a small 2core 5110  @ 1.60GHz, I can achieve around 500mbit/s

But the cpu is limiting the speed.  (so 500mbits vm<->host, or 250mbits vm<->vm)

(seem that virtio-net windows use a lot more cpu than linux)

I try to play with offloading to see if I can improve performance.


----- Mail original ----- 

De: "Alexandre DERUMIER" <aderumier at odiso.com> 
À: "Dietmar Maurer" <dietmar at proxmox.com> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Samedi 29 Mars 2014 13:22:21 
Objet: Re: [pve-devel] win8r2 virtio net problems 

Hi, I never reach myself more than 900Mbits with windows guest. (2003 > 2012, any virito driver 

But 30mbit/s seem very slow. 

Maybe trying to play with disabling offloading options (in windows guest driver options) ? gro,gso,... 


----- Mail original ----- 

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: pve-devel at pve.proxmox.com 
Envoyé: Vendredi 28 Mars 2014 15:07:23 
Objet: [pve-devel] win8r2 virtio net problems 



Hi all, 

we just observed bad performance values with virtio network on win8r2 guests. 

A simple iperf from a VM to the host shown about 700Mbit/s. 

Even worse, iperf between 2 win8r2 guests on the same bridge shown below 30Mbit/s. 

Using linux VMs, I am able to get > 9Gbit/s. 

I already made all optimizations suggested at: 

http://pve.proxmox.com/wiki/Paravirtualized_Network_Drivers_for_Windows 

Any ideas? 

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