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Date: Fri, 22 Sep 2017 10:06:31 -0400 From: Willem de Bruijn <willemdebruijn.kernel@...il.com> To: Petar Penkov <peterpenkov96@...il.com> Cc: Network Development <netdev@...r.kernel.org>, Eric Dumazet <edumazet@...gle.com>, Mahesh Bandewar <maheshb@...gle.com>, Willem de Bruijn <willemb@...gle.com>, David Miller <davem@...emloft.net>, ppenkov@...nford.edu Subject: Re: [PATCH,v2,net-next 1/2] tun: enable NAPI for TUN/TAP driver On Thu, Sep 21, 2017 at 10:17 PM, Petar Penkov <peterpenkov96@...il.com> wrote: > Changes TUN driver to use napi_gro_receive() upon receiving packets > rather than netif_rx_ni(). Adds flag IFF_NAPI that enables these > changes and operation is not affected if the flag is disabled. SKBs > are constructed upon packet arrival and are queued to be processed > later. > > The new path was evaluated with a benchmark with the following setup: > Open two tap devices and a receiver thread that reads in a loop for > each device. Start one sender thread and pin all threads to different > CPUs. Send 1M minimum UDP packets to each device and measure sending > time for each of the sending methods: > napi_gro_receive(): 4.90s > netif_rx_ni(): 4.90s > netif_receive_skb(): 7.20s > > Signed-off-by: Petar Penkov <peterpenkov96@...il.com> > Cc: Eric Dumazet <edumazet@...gle.com> > Cc: Mahesh Bandewar <maheshb@...gle.com> > Cc: Willem de Bruijn <willemb@...gle.com> > Cc: davem@...emloft.net > Cc: ppenkov@...nford.edu Acked-by: Willem de Bruijn <willemb@...gle.com> Thanks, Petar.
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