[pve-devel] win8r2 virtio net problems

[Alexandre DERUMIER]

I have just done test with nttctp, i have bad results, around 30mbits/s with 256k or 3mbits with 64k..
(cpu limited)


I have also do test with netperf (netperf.org),  windows guest->linux host : 5gb/s!  (with tso)
(cpu limited)

or 500mbit/s without tso  (same than iperf)



so, it's really seem than iperf use a lot more cpu. (maybe because of cygwin ?)



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

De: "Alexandre DERUMIER" <aderumier at odiso.com> 
À: "Dietmar Maurer" <dietmar at proxmox.com> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Lundi 31 Mars 2014 05:05:42 
Objet: Re: [pve-devel] win8r2 virtio net problems 

>>On same VMs, using Using ntttcp i get 157MB/s! So seems there is something wrong with ipperf. 

Maybe the windows size is different, or nttcp make more parallelism (-P in ipperf). 

I think parallelism speed up receive offload (rss), on multi core guest. 


I'll do test with win2008R2 today 

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

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Lindsay Mathieson" <lindsay.mathieson at gmail.com>, pve-devel at pve.proxmox.com 
Envoyé: Dimanche 30 Mars 2014 09:06:01 
Objet: Re: [pve-devel] win8r2 virtio net problems 

> > now, vm->host, jump from 500mbits to 1,5gbits ! (always cpu limited) 
> > 
> > now sure that lso is supported by all windows versions, I need to 
> > check that. (and stability too) 
> 
> 
> Not working for me unfortunately. Two 2008R2 servers with offload Tx LSO 
> set to Maximal, only getting 41 Mbps 
> 
> This when both VM's are on the same bridge and node, 1GB ethernet. 

On same VMs, using Using ntttcp i get 157MB/s! So seems there is something wrong with ipperf. 


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