Re: [virtio-comment] [PATCH requirements 4/7] net-features: Add notification coalescing requirements

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Jun 02, 2023 at 01:03:02AM +0300, Parav Pandit wrote:
> Add virtio net device notification coalescing improvements requirements.
> 
> Signed-off-by: Parav Pandit <parav@nvidia.com>
> ---
>  net-workstream/features-1.4.md | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/net-workstream/features-1.4.md b/net-workstream/features-1.4.md
> index 054f951..fc36f31 100644
> --- a/net-workstream/features-1.4.md
> +++ b/net-workstream/features-1.4.md
> @@ -8,6 +8,7 @@ together is desired while updating the virtio net interface.
>  # 2. Summary
>  1. Device counters visible to the driver
>  2. Low latency tx and rx virtqueues for PCI transport
> +3. Virtqueue notification coalescing re-arming support
>  
>  # 3. Requirements
>  ## 3.1 Device counters
> @@ -143,3 +144,10 @@ struct vnet_rx_completion {
>  7. The device should be able to indicate when a full page buffer is consumed,
>     which can be recycled by the driver when the packets from the completed
>     page is fully consumed.
> +
> +## 3.3 Virtqueue notification coalescing re-enable support
> +1. Tx and Rx virtqueue notification coalescing should auto-disable on
> +   notification reporting to the driver. The driver should be able to enable
> +   coalescing after processing the packets per VQ. This ensures that when
> +   networking stack decides to poll, no new notifications are generated when
> +   per VQ notification coalescing is used.

Weirdly specific.
I don't know what does auto-disable and enable coalescing mean.
Does this refer to VIRTIO_NET_F_NOTF_COAL?
what is the problem this is trying to solve?

> -- 
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