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[209.132.180.67]) by mx.google.com with ESMTP id e25si3662655otk.62.2020.03.05.03.32.10; Thu, 05 Mar 2020 03:32:21 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-wireless-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=Li+6lDK9; spf=pass (google.com: best guess record for domain of linux-wireless-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-wireless-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727322AbgCEL3t (ORCPT + 99 others); Thu, 5 Mar 2020 06:29:49 -0500 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:37370 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725897AbgCEL3t (ORCPT ); Thu, 5 Mar 2020 06:29:49 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583407788; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=bWmZYuBqFe4P6NKv7YNOQnNI/DTRjEGt3iV2gL4Rqx0=; b=Li+6lDK9ddzEHnCVpulG+pr+rTJ9TfX+QtNda3COaLgFZ4xYeyU6pJXEAWV0YZkfKeJ06i mJewXL54DBb76rOO0fq4ceeH0LDQli7oRRLyiAL7E5TsgOYso17wiKLMFUkFxfWMBiQle7 NP5zkAa3+cRdncH0FvGhkB2aNeIBJNI= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-48-NuP4xlpXMVesm7ygN31waQ-1; Thu, 05 Mar 2020 06:29:47 -0500 X-MC-Unique: NuP4xlpXMVesm7ygN31waQ-1 Received: by mail-wm1-f69.google.com with SMTP id b23so1967058wmj.3 for ; Thu, 05 Mar 2020 03:29:46 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:in-reply-to:references:date :message-id:mime-version; bh=bWmZYuBqFe4P6NKv7YNOQnNI/DTRjEGt3iV2gL4Rqx0=; b=jpC3zphfkSnAfZ/2mdPxyprg7yNDlHY4BZtcdqSCgOuv353/8Hxaglx6Q2e9in4GI6 non5yXGBbwlmen6iKHq+8tzcaG7gopKPnBh5lHjiiwXytl8BJHRdoAqdd4VkD/drRzZ7 90yUF+dS5C4qPCu3kFpmN0FSD6DQXsEZoVfKEzvZ288+uMPXF8MVipTIjx8uae/0ZV6i 3kyfwtgXRb3qNGSYYtZ2kfD9rxMSC1GOYNDxPW5ARjgnWx2rbF2kkVPhguyqSjmBqOKs emMqvpt9NAmIzGwW8sAtCqm3Gsj30KHvPl4c4VO+Gx//KahOc3Dqplat0WdZUZva5vcs DLTw== X-Gm-Message-State: ANhLgQ0DaurQVFeBf6F0UEXJZWFQB4lH90SMeHdqSNn/OMiLRhFLzP5e eW9SEG5Nknh5pQ+6K6G3QyZ9/OLzH5yoKkC/Hi5w3ndAIpyS+m5ffgfwTb24A4+dtt8qc4dV5tq PRFPRrNLGlRbeAh4yvxxJ4PAt1VY= X-Received: by 2002:a05:600c:24d2:: with SMTP id 18mr9089743wmu.149.1583407785559; Thu, 05 Mar 2020 03:29:45 -0800 (PST) X-Received: by 2002:a05:600c:24d2:: with SMTP id 18mr9089730wmu.149.1583407785392; Thu, 05 Mar 2020 03:29:45 -0800 (PST) Received: from alrua-x1.borgediget.toke.dk ([2a0c:4d80:42:443::2]) by smtp.gmail.com with ESMTPSA id z11sm8662608wmd.47.2020.03.05.03.29.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Mar 2020 03:29:44 -0800 (PST) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 1214218034F; Thu, 5 Mar 2020 12:29:43 +0100 (CET) From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= To: Wei Liu , linux-wireless@vger.kernel.org, linuxwifi@intel.com Subject: Re: Precise time synchronization via wifi interface (intel AX201 iwlwifi driver) In-Reply-To: <032f07e2-2771-619b-52b4-a25c8cd10f86@gmail.com> References: <032f07e2-2771-619b-52b4-a25c8cd10f86@gmail.com> X-Clacks-Overhead: GNU Terry Pratchett Date: Thu, 05 Mar 2020 12:29:43 +0100 Message-ID: <87r1y72g60.fsf@toke.dk> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Wei Liu writes: > Hi, > > I am trying to achieve precise time synchronization via wifi > interface. Erm, good luck with that? :) You do realise that there's a whole bunch of stuff going on below the driver level (listen-before-send, etc) that makes 'precise' timing (as in microsecond-accuracy like ptp)... shall we just say challenging? -Toke