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

[Peter Lieven]

Am 16.11.2012 um 12:00 schrieb Alexandre DERUMIER <address@hidden>:

>>> 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

Have you had any further progress on this regression/problem?

Thanks,
Peter

> 
> 
> 
> 
> ----- 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 :-/