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Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores |
Date: |
Tue, 13 Nov 2012 19:03:14 +0200 |
On Tue, Nov 13, 2012 at 05:27:17PM +0100, Peter Lieven wrote:
>
> Am 13.11.2012 um 17:26 schrieb Michael S. Tsirkin:
>
> > On Tue, Nov 13, 2012 at 05:21:50PM +0100, Peter Lieven wrote:
> >> On 13.11.2012 17:22, Michael S. Tsirkin wrote:
> >>> On Tue, Nov 13, 2012 at 12:49:03PM +0100, Peter Lieven wrote:
> >>>> On 09.11.2012 19:03, Peter Lieven wrote:
> >>>>> Remark:
> >>>>> If i disable interrupts on CPU1-3 for virtio the performance is ok
> >>>>> again.
> >>>>>
> >>>>> Now we need someone with deeper knowledge of the in-kernel irqchip and
> >>>>> the
> >>>>> virtio/vhost driver development to say if this is a regression in
> >>>>> qemu-kvm
> >>>>> or a problem with the old virtio drivers if they receive the interrupt
> >>>>> on
> >>>>> different CPUs.
> >>>> anyone?
> >>> Looks like the problem is not in the guest: I tried ubuntu guest
> >>> on a rhel host, I got 8GB/s with vhost and 4GB/s without
> >>> on a host to guest banchmark.
> >> which ubuntu version in the guest?
> >>
> >> Peter
> >
> > ubuntu-10.04.4-server-amd64.iso
>
> can you try with vnet_hdr=on on the nic.
You mean on tap? Same thing.
> the bug seems to be only relevant when vhost-net is used.
>
> Dietmar, see you implications with normal virtio?
>
> Peter
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, (continued)
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/09
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/09
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/09
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/09
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Michael S. Tsirkin, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Michael S. Tsirkin, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores,
Michael S. Tsirkin <=
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Michael S. Tsirkin, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Michael S. Tsirkin, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Michael S. Tsirkin, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/15
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/16
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Alexandre DERUMIER, 2012/11/16
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/19