From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: [PATCH net 6/9] virtio-net: make rx buf size estimation works for XDP Date: Fri, 23 Dec 2016 22:37:29 +0800 Message-ID: <1482503852-12438-7-git-send-email-jasowang@redhat.com> References: <1482503852-12438-1-git-send-email-jasowang@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1482503852-12438-1-git-send-email-jasowang@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: mst@redhat.com, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.r.fastabend@intel.com List-Id: virtualization@lists.linuxfoundation.org We don't update ewma rx buf size in the case of XDP. This will lead underestimation of rx buf size which causes host to produce more than one buffers. This will greatly increase the possibility of XDP page linearization. Cc: John Fastabend Signed-off-by: Jason Wang --- drivers/net/virtio_net.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 0778dc8..77ae358 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -584,10 +584,12 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, put_page(page); head_skb = page_to_skb(vi, rq, xdp_page, 0, len, PAGE_SIZE); + ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); return head_skb; } break; case XDP_TX: + ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); if (unlikely(xdp_page != page)) goto err_xdp; rcu_read_unlock(); @@ -596,6 +598,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, default: if (unlikely(xdp_page != page)) __free_pages(xdp_page, 0); + ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); goto err_xdp; } } -- 2.7.4