From owner-freebsd-net@freebsd.org Mon Apr 17 23:49:51 2017 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 91FB8D4202F for ; Mon, 17 Apr 2017 23:49:51 +0000 (UTC) (envelope-from dreadiscool@gmail.com) Received: from mail-wm0-x22d.google.com (mail-wm0-x22d.google.com [IPv6:2a00:1450:400c:c09::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 2B9AF1731 for ; Mon, 17 Apr 2017 23:49:51 +0000 (UTC) (envelope-from dreadiscool@gmail.com) Received: by mail-wm0-x22d.google.com with SMTP id u2so41944776wmu.0 for ; Mon, 17 Apr 2017 16:49:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=BKSDMALF6E8jipnwE6DfuTxboRFE5uMhF48zd0Q3LkQ=; b=RZH+l3y9D4EFPjfq9iEhvNvKEETCrXp0hqOJ2oQ5Ce6/VU+D0MqFmWTzkizhoOFVzZ aMkcCZRRTQmf4FP9pSfjsk2Z85Pqb2AZcZl2SFFH9ZSCukBy1/jgi5pq9Pe4/8M8ZRoC 3A6kfgcnM5ySTfPxiloAIGAzU5oOv4eR2K9+80GMoXms1IQxA4PrZ8ElY68KKn87sKbb 0e/QZvYvXC5mytIY+f+Erhi7vxs38391qz7qdFztckmDL/zn3mnHNvFKrgiOYhxg9Nol 2G+DlZ/0FJhWJc+LhzRTl3EQBXfwYLlSIrsEQ9DE17MGeAL6kVApbqR6Hpp5YaNvc+S0 9tRQ== 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=BKSDMALF6E8jipnwE6DfuTxboRFE5uMhF48zd0Q3LkQ=; b=OPYKyyy0krRURO7P20JdCALTz9IntojFUhrdUQC7nJInIIlAvfk8cRyyC5ZWewcfFg xSNVUm2U1Q4SYug/a5UpLgOfgVxy0/D14N80r+GvDt3wvDQeZdYLCDLOlHAZhCQcw7dt 0FQbBSett9Dv+iNk+AqVB3qsAK1GHnhOW+6XM7vG38thtvXeUB5yOkjEq25jpJrPqJrx YSkQG311VgaeJxzrrzc7mr+OI3uG93f0KFytVPnCxsmCIzpfNWNCmhQQgOBZWTpvAcj1 nshI2rWPMusYbuuC4Sa8qDc9CQSuWtCougWdal23g0X/97uM+3dkXwb7IOtluQ+sxYgI eB0Q== X-Gm-Message-State: AN3rC/6qQK/dbOOwb0NJxLqVnni9GHAVDxVM4YgNM/IcH6XZksXRa5rq 4zCXzTrfQcrphRmMJm9aEgvIivFC6aT+ X-Received: by 10.28.0.201 with SMTP id 192mr10984834wma.126.1492472986122; Mon, 17 Apr 2017 16:49:46 -0700 (PDT) MIME-Version: 1.0 Received: by 10.223.165.68 with HTTP; Mon, 17 Apr 2017 16:49:45 -0700 (PDT) From: Paras Jha Date: Mon, 17 Apr 2017 19:49:45 -0400 Message-ID: Subject: Netmap zero-copy with multiple NICs To: FreeBSD Net Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.23 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Apr 2017 23:49:51 -0000 Is it still possible to share ring buffers across multiple physical network cards for zero-copy mode, or does the application need to take this into account and perform a one-copy?