> -----Original Message----- > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Huawei Xie > Sent: Monday, September 21, 2015 4:16 PM > To: dev at dpdk.org > Subject: [dpdk-dev] [PATCH] vhost: vhost injects interrupts to guest for each > packet > > In merge-able RX path, vhost injects interrupts to guest for each packet. > This should degrade performance a lot. > This patch fixes this issue by injecting one interrupt for a batch of packets. > > Signed-off-by: Huawei Xie <huawei.xie at intel.com> > --- > lib/librte_vhost/vhost_rxtx.c | 7 +++++-- > 1 file changed, 5 insertions(+), 2 deletions(-) > > diff --git a/lib/librte_vhost/vhost_rxtx.c b/lib/librte_vhost/vhost_rxtx.c > index 0d07338..9d3165a 100644 > --- a/lib/librte_vhost/vhost_rxtx.c > +++ b/lib/librte_vhost/vhost_rxtx.c > @@ -496,7 +496,7 @@ virtio_dev_merge_rx(struct virtio_net *dev, uint16_t > queue_id, > "to get enough desc from " > "vring\n", > dev->device_fh); > - return pkt_idx; > + goto merge_rx_exit; > } else { > update_secure_len(vq, res_cur_idx, > &secure_len, &vec_idx); > res_cur_idx++; > @@ -523,7 +523,10 @@ virtio_dev_merge_rx(struct virtio_net *dev, > uint16_t queue_id, > > *(volatile uint16_t *)&vq->used->idx += entry_success; > vq->last_used_idx = res_cur_idx; > + } > > +merge_rx_exit: > + if (likely(pkt_idx)) { > /* flush used->idx update before we read avail->flags. */ > rte_mb(); > > @@ -532,7 +535,7 @@ virtio_dev_merge_rx(struct virtio_net *dev, uint16_t > queue_id, > eventfd_write((int)vq->callfd, 1); > } > > - return count; > + return pkt_idx; > } > > uint16_t > --
Acked-by: Jianfeng Tan <Jianfeng.tan at intel.com> > 1.9.3
