Re: [RFC] lib/librte_vhost: qemu vhost-user support into DPDK vhost library

(2014/08/27 9:43), Ouyang, Changchun wrote:

Do we have performance comparison between both implementation?

Hi Changchun,

If DPDK applications are running on both guest and host side, the
performance should be almost same, because while transmitting data virt
queues are accessed by virtio-net PMD and libvhost. In libvhost, the
existing vhost implementation and a vhost-user implementation will
shares or uses same code to access virt queues. So I guess the
performance will be almost same.

Thanks,
Tetsuya

Thanks
Changchun


-----Original Message-----
From: dev [mailto:dev-bounces-VfR2kkLFssw@public.gmane.org] On Behalf Of Xie, Huawei
Sent: Tuesday, August 26, 2014 7:06 PM
To: dev-VfR2kkLFssw@public.gmane.org
Subject: Re: [dpdk-dev] [RFC] lib/librte_vhost: qemu vhost-user support into DPDK vhost library

Hi all:
We are implementing qemu official vhost-user interface into DPDK vhost library, so there would be two coexisting implementations for user space vhost backend.
Pro and cons in my mind:
Existing solution:
Pros:  works with qemu version before 2.1;  Cons: depends on eventfd proxy kernel module and extra maintenance effort Qemu vhost-user:
               Pros:  qemu official us-vhost interface;     Cons: only available after qemu 2.1

BR.
huawei