netdev - Re: [RFC PATCH] virtio_net: Extend virtio to use VF datapath when available

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Date:   Tue, 19 Dec 2017 17:47:07 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Sridhar Samudrala <sridhar.samudrala@...el.com>
Cc:     stephen@...workplumber.org, netdev@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        alexander.duyck@...il.com
Subject: Re: [RFC PATCH] virtio_net: Extend virtio to use VF datapath when
 available

I'll need to look at this more, in particular the feature
bit is missing here. For now one question:

On Mon, Dec 18, 2017 at 04:40:36PM -0800, Sridhar Samudrala wrote:
> @@ -56,6 +58,8 @@ module_param(napi_tx, bool, 0644);
>   */
>  DECLARE_EWMA(pkt_len, 0, 64)
>  
> +#define VF_TAKEOVER_INT	(HZ / 10)
> +
>  #define VIRTNET_DRIVER_VERSION "1.0.0"
>  
>  static const unsigned long guest_offloads[] = {

Why is this delay necessary? And why by 100ms?