netdev - Re: [PATCH net-next v4] net: virtio_net: notifications coalescing support

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Message-ID: <CAJs=3_BtM2CTRLaA28R7_yjfFcq+wexQudfXBM0jWX02ZkacyQ@mail.gmail.com>
Date:   Wed, 20 Jul 2022 10:56:51 +0300
From:   Alvaro Karsz <alvaro.karsz@...id-run.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next v4] net: virtio_net: notifications coalescing support

> And we need an upper limit for those values, this helps for e.g
> migration compatibility.

Why not let the device decide the upper limit, making it device specific?
As written in the spec., a device can answer to the coalescing command
with VIRTIO_NET_ERR,
If it was not able to set the requested settings.

If a physical device uses virtio datapath, and can for example
coalesce notifications up to 500us, why should we limit it with a
lower number?