netdev - Re: [RFC] VSOCK: The performance problem of vhost

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Message-ID: <30d7c370-b206-cdac-dc85-53e9be1e1c63@redhat.com>
Date:   Mon, 15 Oct 2018 10:33:08 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     jiangyiwen <jiangyiwen@...wei.com>, stefanha@...hat.com
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org
Subject: Re: [RFC] VSOCK: The performance problem of vhost_vsock.



On 2018年10月15日 09:43, jiangyiwen wrote:
> Hi Stefan & All:
>
> Now I find vhost-vsock has two performance problems even if it
> is not designed for performance.
>
> First, I think vhost-vsock should faster than vhost-net because it
> is no TCP/IP stack, but the real test result vhost-net is 5~10
> times than vhost-vsock, currently I am looking for the reason.

TCP/IP is not a must for vhost-net.

How do you test and compare the performance?

Thanks

> Second, vhost-vsock only supports two vqs(tx and rx), that means
> if multiple sockets in the guest will use the same vq to transmit
> the message and get the response. So if there are multiple applications
> in the guest, we should support "Multiqueue" feature for Virtio-vsock.
>
> Stefan, have you encountered these problems?
>
> Thanks,
> Yiwen.
>