From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 95F1DA0518 for ; Thu, 23 Jul 2020 23:10:45 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id E9C0F1BFFB; Thu, 23 Jul 2020 23:10:44 +0200 (CEST) Received: from mail-oi1-f172.google.com (mail-oi1-f172.google.com [209.85.167.172]) by dpdk.org (Postfix) with ESMTP id 012201BFD7 for ; Thu, 23 Jul 2020 23:10:43 +0200 (CEST) Received: by mail-oi1-f172.google.com with SMTP id l63so6237637oih.13 for ; Thu, 23 Jul 2020 14:10:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=radio-canada-ca.20150623.gappssmtp.com; s=20150623; h=mime-version:from:date:message-id:subject:to; bh=0HKEzBsNvdEXi2emLdLo1OVjMQmHV5ls/3cZKkkV3B0=; b=q9TNt4uf6RllMF6gjv3cj0EhKSs12xBalPZviSWMRhw3v34K+zhfIhUjw2S2Y/V8xW NQrhepYeBtFmx8TM4k8gwyfma31+EJW1Qp4vNuNHlZ8D1wrkl0bO49BUIqzfGK/XsaZW Lgtv5qG/EYWawKq9wuMkiaVEITnjQpyjNiOYaNG32+Y65y+XhXIZOMuVV8ZrDisWuTUM 3DkmlhwG99Nq8I/7Apmil1BXbVXQTyhHwet6yGvJrdI6yMMLMUkFBu78tBGwbah6dAM9 t8dDg9vgAgG+pJ4LjKj2sSdh0NPU1GyQERAmcbQvv9IStvT0gZPps5hZ91yMobSY2cj8 fwdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=0HKEzBsNvdEXi2emLdLo1OVjMQmHV5ls/3cZKkkV3B0=; b=p3pWLstslsnzMfklD8SfcKuxu/AWj6HrA4+qycozc5ZVrsCmMUAfAR/7kOHGOVlJjd 6QPTUUg2k08hsnKVAyAGJ1rqzFDU7ud3N65A70Z8e4dwdyxbPkJtR5E3YUy8Ar7nkow7 TKmfHuKaTFlNBVlI//zpquedhRYbkf6cEncAnejFa8P1XbjaZsyNePrw4LXZ37MAHBg6 3bz6jWuK+jmArE7iKiCI9sxek8ntHozqSb3a+a9eMmaWZbUeSYu+h2D+Hkv0UwGvymuy Ztc+AXLkUCeP1aNrNHimrBwuX1Q85Bi4OQlUhNUiFv5yp29LCScEw2hE+R1ErYrNVwZm OTyQ== X-Gm-Message-State: AOAM532uQls2R2uURzY9hnkJT+5gujOWR6rN/GA4EdT2GuxESJOyJsmS akZIul12+x3VytULI5J8dz+3NzzctlFGc8VcdJ+sSgkpW6w= X-Google-Smtp-Source: ABdhPJyXND717e8yr6ZrQcYryeKkEBcL8Xvv91K+Q9S5ctExkkq8uOuOWkRfx42/IzWIbN7JBy0Z83XnDbiP4/0MqiU= X-Received: by 2002:aca:5c03:: with SMTP id q3mr5705160oib.132.1595538642958; Thu, 23 Jul 2020 14:10:42 -0700 (PDT) MIME-Version: 1.0 From: PATRICK KEROULAS Date: Thu, 23 Jul 2020 17:10:31 -0400 Message-ID: To: users@dpdk.org Content-Type: text/plain; charset="UTF-8" Subject: [dpdk-users] mlx5 / tcpdump: packet drop 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" Hello, I'm trying to use tcpdump with dpdk support in order to benefit from dpdk performance and nice features from tcpdump, like filters etc. Traffic is constant but quite significant, 6 Gbps, captured by Mellanox ConnectX-5. DPDK standalone works like a charm, no packet drop. $ testpmd -w 0000:01:00.0 -w 0000:01:00.1 -- --enable-rx-timestamp $ dpdk-pdump -- --pdump 'port=0,queue=*,rx-dev=/tmp/test.pcap' However,when using libpcap/tcpdump on exact same hardware and dpdk version, 15% of the pkts are dropped by interface: $ DPDK_CFG="-dlibrte_mempool_ring.so -dlibrte_common_mlx5.so \ -dlibrte_pmd_mlx5.so " ./tcpdump -i dpdk:0 -w /tmp/test.pcap [...] tcpdump: listening on dpdk:0, link-type EN10MB (Ethernet), snapshot length 262144 bytes t ^CUSER1: portid:0, RX-packets: 3778136 RX-errors: 0 RX-bytes: 4767864278 RX-Imissed: 215784 USER1: portid:0, RX-PPS: 613698 RX-Mbps: 6195.72 3778136 packets captured 3778136 packets received by filter 0 packets dropped by kernel 215784 packets dropped by interface What should I look at first? mempool, queue, dev init sequence? dpdk v20.05 libpcap 1.8.1 Best regards, Patrick