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@xxxxxxxxxxxxxxxxx> wrote:
> >
> > Similar to rx netdim, this patch supports adaptive tx
> > coalescing moderation for the virtio-net.
> >
> > Signed-off-by: Heng Qi <hengqi@xxxxxxxxxxxxxxxxx>
> > ---
> > 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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