netdev - Re: [PATCH net-next] virtio_net: exploit napi_complete

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Message-Id: <20170204.193901.790935994094939434.davem@davemloft.net>
Date:   Sat, 04 Feb 2017 19:39:01 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org, jasowang@...hat.com, mst@...hat.com,
        willemb@...gle.com
Subject: Re: [PATCH net-next] virtio_net: exploit napi_complete_done()
 return value

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sat, 04 Feb 2017 07:49:21 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Since commit 364b6055738b ("net: busy-poll: return busypolling status to
> drivers"), napi_complete_done() returns a boolean that can be used
> by drivers to conditionally rearm interrupts.
> 
> This patch changes virtio_net to use this boolean to avoid a bit of
> overhead for busy-poll users.
> 
> Jason reports about 1.1% improvement for 1 byte TCP_RR (burst 100).
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Acked-by: Jason Wang <jasowang@...hat.com>

Applied.