netdev - Re: [PATCH rfc 2/3] virtio-net: support receive timestamp

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Message-ID: <20201230123026.GA2034@hoboy.vegasvil.org>
Date:   Wed, 30 Dec 2020 04:30:26 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        virtualization@...ts.linux-foundation.org,
        Network Development <netdev@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>
Subject: Re: [PATCH rfc 2/3] virtio-net: support receive timestamp

On Mon, Dec 28, 2020 at 07:57:20PM -0500, Willem de Bruijn wrote:
> There is a well understood method for synchronizing guest and host
> clock in KVM using ptp_kvm. For virtual environments without NIC
> hardware offload, the when host timestamps in software, this suffices.
> 
> Syncing host with NIC is assumed if the host advertises the feature
> and implements using real hardware timestamps.

Sounds reasonable.

Thanks,
Richard