From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-x232.google.com (mail-pl0-x232.google.com [IPv6:2607:f8b0:400e:c01::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 5C14F3BA8E for ; Sun, 17 Jun 2018 21:02:34 -0400 (EDT) Received: by mail-pl0-x232.google.com with SMTP id a7-v6so8087338plp.3 for ; Sun, 17 Jun 2018 18:02:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=EWqhoRiBy3LC/2zKDJtLyAe4bxaDPguuvrScjdH2gqE=; b=EtwuclrTGzFINN8rGWU5KtetHqc7VLmUDe52Vcs4IUI7Ohp1eeEDPozJn5E7nJP3E1 TRkwzePQ27bjksy6+oF06Li19DQ0AFj7hl+dHPGb7EK28JowZugIH8LYN8euHLMc7opH GYNqNAMDjL9YQH93d9uBdajPk3Y7rUY7wKFhJ5rtySlCYI3akCOjxHEzW3/dqVH4GCIF XKkUz4WHJna6zN2HOTUNQZhGsxIIxx8yi3RBo3LGqgtdAgoxpn2UsyFpPDa3Mo50AVf4 UZOVJJYppQkbEk5dHT6n0Nv0E9hPjivmGk//SJ0BItYQjtrbf2A3i9QDQ0NRGsqHe9F2 QvIw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=EWqhoRiBy3LC/2zKDJtLyAe4bxaDPguuvrScjdH2gqE=; b=Eun56z/02Bo/Ptv00mCkKg9qPlwTiw4P6aMH+sQfV2oD6UtUisHcBYWn6o5emY/4KK piYVdID6TLT8sxib9SvIS6Z9x1yqSynkDhQmc5VIvfRDv+NzML2lFKfIwHXVArhg1EmC jZ7eZvcZgZloy3i4owOGQ5w2I3EC/6bzuaMHKa4g0ua42/6ImE6f2QnzJZEEtErAr5ym hSRD5THIIn+TPx+jiLg+vDH+jRmn5PXMZsVm4Kh5uTersJXutYP10NImiiDH6aWcZqi6 sXGXtO8UKU67tB+cs9esVDiWLJl+h7Hxea64KUbB71s3ND6Uerv2Z+gSz0dkVgCzP1Vc EfZw== X-Gm-Message-State: APt69E0d0VWbhRQyzErucRLEqWT62FDfb+DbB5p9W8faUJP2bndvseBg F7Fe5dwf0OfwA9HVqwnh4K45mUCR X-Google-Smtp-Source: ADUXVKKunH+zLFgqWD/gMLwy6AJ6Op81DQtNRV6vtdhqTI6rrTFvi8nZOtSEXW3JlY8z2/3/2FD6hA== X-Received: by 2002:a17:902:981:: with SMTP id 1-v6mr11895838pln.11.1529283753482; Sun, 17 Jun 2018 18:02:33 -0700 (PDT) Received: from [192.168.86.235] (c-67-180-167-114.hsd1.ca.comcast.net. [67.180.167.114]) by smtp.gmail.com with ESMTPSA id g10-v6sm5861041pgs.17.2018.06.17.18.02.32 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 17 Jun 2018 18:02:32 -0700 (PDT) To: make-wifi-fast@lists.bufferbloat.net References: <1527721073.171416827@apps.rackspace.com> <150ABF21-FAFC-48E2-9E55-CAA609EAE449@heistp.net> <20180617131921.09bf5353@redhat.com> From: Eric Dumazet Message-ID: <870b8024-6302-c17f-daef-fea11bdc9c9c@gmail.com> Date: Sun, 17 Jun 2018 18:02:31 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [Make-wifi-fast] emulating wifi better - coupling qdiscs in netem? X-BeenThere: make-wifi-fast@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Jun 2018 01:02:34 -0000 On 06/17/2018 01:42 PM, Dave Taht wrote: > On Sun, Jun 17, 2018 at 11:38 AM, Pete Heist wrote: >> >>> On Jun 17, 2018, at 6:09 PM, Dave Taht wrote: >>> >>> I'm pleased that these are apu2 results, I have some hope that a >>> heftier box can do better. >> >> I suspect 10-20x is possible on more modern, desktop class hardware. > > I appreciate the optimism, but it's context switch time that dominates > here which does not scale. Hey, do not use context switches, if you want low latencies on something that will be used for testing purposes.