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Message-ID: <20231025015010-mutt-send-email-mst@kernel.org> Date: Wed, 25 Oct 2023 01:50:38 -0400 From: "Michael S. Tsirkin" <mst@...hat.com> To: Jason Wang <jasowang@...hat.com> Cc: Heng Qi <hengqi@...ux.alibaba.com>, netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Eric Dumazet <edumazet@...gle.com>, "David S. Miller" <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>, Jesper Dangaard Brouer <hawk@...nel.org>, John Fastabend <john.fastabend@...il.com>, Alexei Starovoitov <ast@...nel.org>, Jakub Kicinski <kuba@...nel.org>, Simon Horman <horms@...nel.org>, "Liu, Yujie" <yujie.liu@...el.com> Subject: Re: [PATCH net-next 5/5] virtio-net: support tx netdim On Wed, Oct 25, 2023 at 11:35:43AM +0800, Jason Wang wrote: > On Thu, Oct 12, 2023 at 3:44 PM Heng Qi <hengqi@...ux.alibaba.com> wrote: > > > > Similar to rx netdim, this patch supports adaptive tx > > coalescing moderation for the virtio-net. > > > > Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com> > > --- > > drivers/net/virtio_net.c | 143 ++++++++++++++++++++++++++++++++------- > > 1 file changed, 119 insertions(+), 24 deletions(-) > > > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > > index 6ad2890a7909..1c680cb09d48 100644 > > --- a/drivers/net/virtio_net.c > > +++ b/drivers/net/virtio_net.c > > @@ -154,6 +154,15 @@ struct send_queue { > > > > struct virtnet_sq_stats stats; > > > > + /* The number of tx notifications */ > > + u16 calls; > > + > > + /* Is dynamic interrupt moderation enabled? */ > > + bool dim_enabled; > > + > > + /* Dynamic Interrupt Moderation */ > > + struct dim dim; > > + > > struct virtnet_interrupt_coalesce intr_coal; > > > > struct napi_struct napi; > > @@ -317,8 +326,9 @@ struct virtnet_info { > > u8 duplex; > > u32 speed; > > > > - /* Is rx dynamic interrupt moderation enabled? */ > > + /* Is dynamic interrupt moderation enabled? */ > > bool rx_dim_enabled; > > + bool tx_dim_enabled; > > > > /* Interrupt coalescing settings */ > > struct virtnet_interrupt_coalesce intr_coal_tx; > > @@ -464,19 +474,40 @@ static bool virtqueue_napi_complete(struct napi_struct *napi, > > return false; > > } > > > > +static void virtnet_tx_dim_work(struct work_struct *work); > > + > > +static void virtnet_tx_dim_update(struct virtnet_info *vi, struct send_queue *sq) > > +{ > > + struct virtnet_sq_stats *stats = &sq->stats; > > + struct dim_sample cur_sample = {}; > > + > > + u64_stats_update_begin(&sq->stats.syncp); > > + dim_update_sample(sq->calls, stats->packets, > > + stats->bytes, &cur_sample); > > + u64_stats_update_end(&sq->stats.syncp); > > + > > + net_dim(&sq->dim, cur_sample); > > +} > > + > > static void skb_xmit_done(struct virtqueue *vq) > > { > > struct virtnet_info *vi = vq->vdev->priv; > > - struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi; > > + struct send_queue *sq = &vi->sq[vq2txq(vq)]; > > + struct napi_struct *napi = &sq->napi; > > + > > + sq->calls++; > > I wonder what's the impact of this counters for netdim. As we have a > mode of orphan skb in xmit. > > We need to test to see. > > Thanks Agreed, performance patches should come with performance results. -- MST
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