From owner-freebsd-net@freebsd.org Sat Dec 2 12:40:52 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 DB12FDFDFBD for ; Sat, 2 Dec 2017 12:40:52 +0000 (UTC) (envelope-from v.maffione@gmail.com) Received: from mail-qt0-x230.google.com (mail-qt0-x230.google.com [IPv6:2607:f8b0:400d:c0d::230]) (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 9DCD16D7BA; Sat, 2 Dec 2017 12:40:52 +0000 (UTC) (envelope-from v.maffione@gmail.com) Received: by mail-qt0-x230.google.com with SMTP id a16so16231042qtj.3; Sat, 02 Dec 2017 04:40:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=LcNNxc89ZbqzaUqUGKFV1sdR1kot46NeNsPwt1D2p/Q=; b=DRL4A2Yz52E029H8dPwvcu22fAlrm39xkLyKd3npucLzpmv5/bEcNc/FnVR5zzIkQA Gn5yPlcMFoj9YBBpydhlInLr+EMADmJ5vkLdvsZiqZCq7KiYQ/8JgSb9QoXV4ZLF7nFp co48C65F4hWiDqHEzj6Jy5eicLP1W+6HS+e+i2SqUk9TjHZWSek99XHpMPP+OeGppWXR 7Vqh5jDWhHh5afbbITAOPgwzHkX1gl5HshiYwL9KBjOmWbHdHG23hYBYYNhF/Wmu8EHR mr5TmOMGBdN4bwoNchESCKtCkxGuC2eYSRNbHkOBMDpxsz3nFsUk14eoh2r/dee6ZP9o 0fzg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=LcNNxc89ZbqzaUqUGKFV1sdR1kot46NeNsPwt1D2p/Q=; b=Q1DpGGU5zDuQ+dhdX8rXI/y8mhL0hgx0CQF0VL9hW9tKTS2Xhul1j59KicV5t1NmbA BKLKZs3158DC8In8bCsf+bjOi5DzKRrWLwuRwicS7RwosPoGxe5/v/eeW6VO1GPSkrq5 4vG+jDmaSszqmD6jHLD/XD5C/TLMemRhp73pVsd+8pM2xhcoMEz1CImv7zIsav8YcK5b J+QkOkGgXuKLY6zTpcfa6KCjEzgEh5qtT5uzRePt8Udy4DIno6m2zA8+7QA8YI9MqnF9 GVnheRy6wIXRLMqACDnTA+SDUI54aW7rv3w1WfW6j75oHJS05XmOBg004EjD0LgErCA1 bqSw== X-Gm-Message-State: AKGB3mKbpThR7s0kzC6MfjmaNT+R2R7v/Um7w59qivA/o/ScFZaib3QB vrl+5Vrvdtdtqywl5nExca82qq/BHNHalyi+M5E= X-Google-Smtp-Source: AGs4zMavUVYOAu5LP4wKd1+Klqh4tAfKZFVF9I68+RJDAW4cPIzc8eM0Vi+LuQKhfk8ljk9ww3N4sSEAdZptnUnaMfs= X-Received: by 10.200.55.155 with SMTP id d27mr13517866qtc.115.1512218451522; Sat, 02 Dec 2017 04:40:51 -0800 (PST) MIME-Version: 1.0 Received: by 10.12.174.5 with HTTP; Sat, 2 Dec 2017 04:40:50 -0800 (PST) In-Reply-To: <5A229AA8.3070002@cox.net> References: <5A206FB9.3010106@cox.net> <5A229AA8.3070002@cox.net> From: Vincenzo Maffione Date: Sat, 2 Dec 2017 13:40:50 +0100 Message-ID: Subject: Re: netmap / LINUX realtime / ixgbevf: huge RX latencies To: Joe Buehler Cc: "K. Macy" , "freebsd-net@freebsd.org" Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.25 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 02 Dec 2017 12:40:53 -0000 HEAD/11 is the FreeBSD version. Your question is about netmap on Linux, so this is the wrong mailing list. You should open an issue on the official netmap https://github.com/luigirizzo/netmap/issues Cheers Vincenzo 2017-12-02 13:20 GMT+01:00 Joe Buehler : > K. Macy wrote: > > > HEAD or 11? > > I'm not quite sure what the question means but there is this in the > netmap code: > > ./net/netmap.h:42:#define NETMAP_API 11 /* current > API version */ > > LINUX kernels nowadays can timestamp frames when they arrive from the > NIC. I made a trivial patch to the netmap driver to turn this on and > also pass the timestamp to user space, and will pass on the changes. I > am doing frame latency measurements and this simple change eliminated a > *whole* lot of noise in the measurements. > > Joe Buehler > _______________________________________________ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > -- Vincenzo Maffione