From owner-freebsd-net@freebsd.org Thu Apr 28 18:35:11 2016 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 DE989B1FB58 for ; Thu, 28 Apr 2016 18:35:11 +0000 (UTC) (envelope-from nparhar@gmail.com) Received: from mail-pa0-x22e.google.com (mail-pa0-x22e.google.com [IPv6:2607:f8b0:400e:c03::22e]) (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 B02AD1E88 for ; Thu, 28 Apr 2016 18:35:11 +0000 (UTC) (envelope-from nparhar@gmail.com) Received: by mail-pa0-x22e.google.com with SMTP id r5so35581249pag.1 for ; Thu, 28 Apr 2016 11:35:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:subject:to:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding; bh=e5hXjG5saqtxqac2kHb+TORcINMEjZ2GgLZjfpF2nCE=; b=MgZ0CLeX2s0DSAwv0HAD32ahdD4NPjZJPw4YJXaf8F/8ozhjiB/zDTj4xVMYXcyHpM 7QoI5/zyChfbIbLjiUmYsMjlbE7jMkUzLO7E4OEDbtwN24Zw63AwTPnpTa3P3Bn3Q9vM Nqt8GGkwkILvmP1Fa10wZVqZAa4PlLczboDaVosMUSlLGuLW4lvAFO/NNJbZWwHhSEbn YhhsQECQK8iQDjUvJRV4sKpIWuWyGREdtl3vJDVhibGVh0cN5hE0xGppiIJoYNJQxnr2 s9jHaXNBRW3eAus2O3Udt3pFXu85USVbzBRs6MZW4vuTPScSmR3+phcAZSU2Z8iLmlaw tNDg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:sender:subject:to:references:from:message-id :date:user-agent:mime-version:in-reply-to:content-transfer-encoding; bh=e5hXjG5saqtxqac2kHb+TORcINMEjZ2GgLZjfpF2nCE=; b=AUspEeczG34BvR9m1Bjws9uEauN3Sv4m/0pNITyHYXGI5ZNJepgiEyVFI0bziFnn5M csf+ApFxYY5t21NG0tVGgLGufa66XSfcaulzlp2X6nAWbwwnSfIZ4+ptxl7HZZ770FWX sgO872nVGAujJ0+qrz+eK/uBNunlUmvWwF8op51KNULkUN0WP9YwRTCv+g1pGLgwGTvH iHcw2JA26VrKjvX7xhrbCo4bIlakJ2Xh2MmeZAUdxvvuNiGF1JSMfBX/FC4y7ITDCZvU uAWyMDV17CXP6jDwhSOqXR9Q3Nx50VHjNfGA/5jHHXBPnkA2QXsjVs8o+L+yUxiKMCy8 /ZTQ== X-Gm-Message-State: AOPr4FVzJj+ikLklOQoG/soXlWHpsr8nMM12NFUiBzGIiavB9idB1JFLvvm9FgmmKzlyZg== X-Received: by 10.66.118.166 with SMTP id kn6mr22724195pab.33.1461868511159; Thu, 28 Apr 2016 11:35:11 -0700 (PDT) Received: from [10.192.166.0] (stargate.chelsio.com. [12.32.117.8]) by smtp.googlemail.com with ESMTPSA id 199sm16910694pfc.15.2016.04.28.11.35.09 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 28 Apr 2016 11:35:09 -0700 (PDT) Sender: Navdeep Parhar Subject: Re: netmap overrun counters To: bazzoola , freebsd-net@freebsd.org References: From: Navdeep Parhar Message-ID: <9fd88731-2cdf-a6da-4b4e-f97bb120696a@FreeBSD.org> Date: Thu, 28 Apr 2016 11:35:08 -0700 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:45.0) Gecko/20100101 Thunderbird/45.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Apr 2016 18:35:12 -0000 On 04/28/2016 11:13, bazzoola wrote: > Hi! > > Two questions: > > (1) Is there a way to know when netmap rx rings overrun? Most NIC > drivers provide MPC (missed packet count) and sysctl for rx_overrun. > > I would like to know if my application is not reading as fast, i.e., no > frames are being dropped. A NIC's hardware counters don't distinguish between netmap or normal operation so you can monitor the existing sysctls for rx drops/overruns. Regards, Navdeep