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Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores |
Date: |
Thu, 08 Nov 2012 10:39:16 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2012-11-06 12:24, Dietmar Maurer wrote:
>> On 2012-11-06 10:46, Dietmar Maurer wrote:
>>>>> This obviously breaks vhost when using multiple cores.
>>>>
>>>> With "obviously" you mean you already have a clue why?
>>>>
>>>> I'll try to reproduce.
>>>
>>> No, sorry - just meant the performance regression is obvious (factor 20 to
>> 40).
>>>
>>
>> OK. Did you try to bisect over qemu-kvm as well?
>
> No (I thought that is the same code base?)
Already answered, though accidentally in private only: it is the same
code base now, but qemu-kvm has a different history and may contain
versions that didn't suffer from the issue.
Meanwhile I quickly tried to reproduce but didn't succeed so far
(>10GBit between host and guest with vhost=on and 2 guest cores).
However, I finally realized that we are talking about a pretty special
host kernel which I don't have around. I guess this is better dealt with
by Red Hat folks. Specifically, they should know what features that
kernel exposes and what it lacks.
Jan
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- 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, Stefan Hajnoczi, 2012/11/05
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/05
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/06
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/06
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/06
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/06
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Jan Kiszka, 2012/11/06
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/06
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Jan Kiszka, 2012/11/06
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/06
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores,
Jan Kiszka <=
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/08
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/08
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/08
- 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