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charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.15 Subject: [dpdk-users] Jumbo packets get segmented on RX X-BeenThere: users@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK usage discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: users-bounces@dpdk.org Sender: "users" Hi, I'm trying to send and receive jumbo frame ethernet packets. While sending works without any issues, I always receive fragmented / segme= nted packets. This leads me to the following questions: 1. Is it possible to receive a frame without segmentation 2. How to properly size the mempool elements. Here, I tried the followin= g (pkt_bytes is the maximum expected frame size): buf_size =3D RTE_PKTMBUF_HEADROOM + pkt_bytes; rte_mempool_create(mempool_name, NB_MBUF, buf_size, MAX_PKT_BURST, sizeof(struct r= te_pktmbuf_pool_private), rte_pktmbuf_pool_init, NULL, rte_pktmbuf_init, NULL, rte_so= cket_id(), MEMPOOL_F_SP_PUT | MEMPOOL_F_S= C_GET); Some experiments with various buf_sizes showed, that if I make the buffer l= arge enough (e.g. pkt_bytes * 2) it seems to work at least for some NICs (w= ith IXGBE driver). DPDK: 20.11-rc1 Best regards, Felix