Re: [Qemu-devel] any known virtio-net regressions in Qemu 2.7?

[Alexandre DERUMIER]

does rollbacking the kernel to previous version fix the problem ?

i'm not sure if "perf" could give you some hints
----- Mail original -----
De: "Stefan Priebe, Profihost AG" <address@hidden>
À: "aderumier" <address@hidden>
Cc: "qemu-devel" <address@hidden>
Envoyé: Mercredi 14 Décembre 2016 21:36:23
Objet: Re: [Qemu-devel] any known virtio-net regressions in Qemu 2.7?

Am 14.12.2016 um 16:33 schrieb Alexandre DERUMIER: 
> Hi Stefan, 
> 
> do you have upgraded kernel ? 

Yes sure. But i'm out of ideas how to debug. Sometimes it gives me 
constant 80MB/s, sometimes 125 and sometimes only 6. While on the host 
the cards are not busy. 

Greets, 
Stefan 

> 
> maybe it could be related to vhost-net module too. 
> 
> 
> ----- Mail original ----- 
> De: "Stefan Priebe, Profihost AG" <address@hidden> 
> À: "qemu-devel" <address@hidden> 
> Envoyé: Mercredi 14 Décembre 2016 16:04:08 
> Objet: [Qemu-devel] any known virtio-net regressions in Qemu 2.7? 
> 
> Hello, 
> 
> after upgrading a cluster OS, Qemu, ... i'm experiencing slow and 
> volatile network speeds inside my VMs. 
> 
> Currently I've no idea what causes this but it's related to the host 
> upgrades. Before i was running Qemu 2.6.2. 
> 
> I'm using virtio for the network cards. 
> 
> Greets, 
> Stefan 
>