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Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores
From: |
Peter Lieven |
Subject: |
Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores |
Date: |
Fri, 15 Mar 2013 08:23:44 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130308 Thunderbird/17.0.4 |
On 15.03.2013 00:04, Davide Guerri wrote:
Yes this is definitely an option :)
Just for curiosity, what is the effect of "in-kernel irqchip"?
it emulates the irqchip in-kernel (in the KVM kernel module) which
avoids userspace exits to qemu. in your particular case I remember
that it made all IRQs deliverd to vcpu0 on. So I think this is a workaround
and not the real fix. I think Michael is right that it is a
client kernel bug. It would be good to find out what it is and ask
the 2.6.32 maintainers to include it. i further have seen that
with more recent kernels and inkernel-irqchip the irqs are delivered
to vcpu0 only again (without multiqueue).
Is it possible to disable it on a "live" domain?
try it. i don't know. you definetely have to do a live migration for it,
but I have no clue if the VM will survice this.
Peter
Cheers,
Davide
On 14/mar/2013, at 19:21, Peter Lieven <address@hidden> wrote:
Am 14.03.2013 um 19:15 schrieb Davide Guerri <address@hidden>:
Of course I can do some test but a kernel upgrade is not an option here :(
disabling the in-kernel irqchip (default since 1.2.0) should also help, maybe
this is an option.
Peter
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Davide Guerri, 2013/03/14
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Alexandre DERUMIER, 2013/03/14
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Michael S. Tsirkin, 2013/03/14
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Davide Guerri, 2013/03/14
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2013/03/14
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Davide Guerri, 2013/03/14
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores,
Peter Lieven <=
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Michael S. Tsirkin, 2013/03/17
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Alexandre DERUMIER, 2013/03/18
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Michael S. Tsirkin, 2013/03/18
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2013/03/25