Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores

[Alexandre DERUMIER]

>>While trying to reproduce the bug, we just detected that it depends on the 
>>hardware (mainboard) you run on.
>>
>>Sigh :-/

Hi,

I can reproduce the bug on all my dell servers,differents generation (R710 
(intel),R815 (amd), 2950 (intel).

They all use broadcom bnx2 network card (don't know if it can be related)

host kernel : rhel 63 with 2.6.32 kernel

guest kernel : 2.6.32  (debian squeeze, ubuntu).

No problem with guest kernel 3.2




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

De: "Dietmar Maurer" <address@hidden>
À: "Peter Lieven" <address@hidden>
Cc: "Stefan Hajnoczi" <address@hidden>, "Peter Lieven" <address@hidden>, "Jan 
Kiszka" <address@hidden>, address@hidden, "Michael S. Tsirkin" <address@hidden>
Envoyé: Vendredi 16 Novembre 2012 11:44:26
Objet: Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores

> > I only tested with RHEL6.3 kernel on host.
>
> can you check if there is a difference on interrupt delivery between those
> two?
>
> cat /proc/interrupts should be sufficient after some traffic has flown.

While trying to reproduce the bug, we just detected that it depends on the 
hardware (mainboard) you run on.

Sigh :-/