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Date: Fri, 16 Nov 2012 12:00:53 +0100 (CET)
From: Alexandre DERUMIER <aderumier@odiso.com>
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Subject: Re: [Qemu-devel] slow virtio network with vhost=on and multiple
	cores
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To: Dietmar Maurer <dietmar@proxmox.com>
Cc: Peter Lieven <pl@dlhnet.de>, "Michael S. Tsirkin" <mst@redhat.com>, Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel@nongnu.org, Jan Kiszka <jan.kiszka@web.de>, Peter Lieven <lieven-lists@dlhnet.de>

>>While trying to reproduce the bug, we just detected that it depends on th=
e 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" <dietmar@proxmox.com> 
=C3=80: "Peter Lieven" <lieven-lists@dlhnet.de> 
Cc: "Stefan Hajnoczi" <stefanha@gmail.com>, "Peter Lieven" <pl@dlhnet.de>, =
"Jan Kiszka" <jan.kiszka@web.de>, qemu-devel@nongnu.org, "Michael S. Tsirki=
n" <mst@redhat.com> 
Envoy=C3=A9: Vendredi 16 Novembre 2012 11:44:26 
Objet: Re: [Qemu-devel] slow virtio network with vhost=3Don and multiple co=
res 

> > I only tested with RHEL6.3 kernel on host. 
> 
> can you check if there is a difference on interrupt delivery between thos=
e 
> 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 :-/