netdev - Re: [RFC] VSOCK: About Virtio-vsock support "Multiqueue" feature ?

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Message-ID: <20181129140647.GB17554@stefanha-x1.localdomain>
Date:   Thu, 29 Nov 2018 14:06:47 +0000
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     jiangyiwen <jiangyiwen@...wei.com>
Cc:     netdev@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Jorgen Hansen <jhansen@...are.com>
Subject: Re: [RFC] VSOCK: About Virtio-vsock support "Multiqueue" feature ?

On Mon, Oct 08, 2018 at 03:06:43PM +0800, jiangyiwen wrote:
> Hi Stefan & All:
> 
> Now virtio-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. In this way, the bandwidth will
> be limited to ~700MB/s. So if there are multiple applications in
> the guest, we should support "Multiqueue" feature for Virtio-vsock.
> 
> I want to know whether we already have plans to support multiqueue
> or already have simple demo that can be used. If not, I will try
> to implement this feature.

Multiqueue is certainly interesting.  It would be interesting to see
if/how it affects common net/vmw_vsock/ code.  Hopefully nothing much
will change there but I haven't checked if any common locking would
prevent multiqueue from working efficiently.

Stefan

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