From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-x233.google.com (mail-wm0-x233.google.com [IPv6:2a00:1450:400c:c09::233]) (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 99AB33B2A4 for ; Mon, 16 Oct 2017 14:28:16 -0400 (EDT) Received: by mail-wm0-x233.google.com with SMTP id f4so5838224wme.0 for ; Mon, 16 Oct 2017 11:28:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; bh=H1btsXKxHpQ6bKLYvyDunsj097t1dTfPKhkBrx9Qqts=; b=Z0WLEyIa2WmOMXXKbDDD/huDKPYe8sLMOq0v5xUCl6++Z2I96CQHJU30fO6PscXAVB kExS4GlfBeTViWzrg7biGBoI6Rds2U5zYtF+dykRiTPp/IfAUsK8HnwHXgsqxIgj40BO 05waE2kjCwrbV5sI2+UAuNncSknUeRkTFNNnuzna+lYfL5/afr3UKJnF6sSoUVOZVWDU 0TkgOJjWxvx/k+PCNYxoms40kU1EOQNwj8hEVqbwnf3l6dPX/DTenbpilzRHjuflDWef pEphX7g97D0BWdMipK6y19wPidyvSzs0QuuGKRfPWvRoKLL+evrOyz7+3GK412SpO+0D dLcg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; bh=H1btsXKxHpQ6bKLYvyDunsj097t1dTfPKhkBrx9Qqts=; b=WUQR+x9qcRQHT9kHFS2MLEw9RKzDthckLHPcQMd1KkYehoYeqLQprjl0DgOww1Urao jwhiOKTH0dhueSTcOyORWEmGBlz/le4nkvOXtWKp0VvFrYuzQdU9ZTzKAoeiVrB2wzgr xpeQHDgsvgQL01lSAMKIjhtkZHM71aM3GnW1LA0/FvmfPfewyLZ8PBcMl+7L15Drs629 I13XOPlDAakf9QLookaVVEE99hkW92nWj/0HLTNie0sOBrfa/PUKfMbg7X5BZMYuIOc4 Jb4JeZ60eCB0sKwopQ9cq3KY3C3cwLW6GCpQBjmhe/gXg6DX0HcWhJFdQGkNTEwSGO0N N7AQ== X-Gm-Message-State: AMCzsaWbB3RauIOjoj7+WfZe/cSpurduSk3/gxGO5jDebCBMp29A+Pqp 3tDtgMa9dxiCgbYp6IcuL9PHSWdY X-Google-Smtp-Source: ABhQp+SUxUPaBOOxrQiQHulGAeb/lVLaXNp0dZJFC08D5ztgTXGzLd5ZKQUTKvsocOgu5+lpbdNpXw== X-Received: by 10.28.100.212 with SMTP id y203mr1740095wmb.100.1508178495488; Mon, 16 Oct 2017 11:28:15 -0700 (PDT) Received: from [10.72.0.130] (h-1169.lbcfree.net. [185.99.119.68]) by smtp.gmail.com with ESMTPSA id v2sm7271088wmf.40.2017.10.16.11.28.14 for (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 16 Oct 2017 11:28:14 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Pete Heist In-Reply-To: Date: Mon, 16 Oct 2017 20:28:13 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: To: make-wifi-fast@lists.bufferbloat.net X-Mailer: Apple Mail (2.3124) Subject: Re: [Make-wifi-fast] less latency, more filling... for wifi 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, 16 Oct 2017 18:28:16 -0000 > On Oct 9, 2017, at 1:13 PM, Dave Taht wrote: >=20 > * Less buffering at the driver. >=20 > Presently (ath9k) there are two-three aggregates stacked up at the = driver. >=20 > With a good estimate for how long it will take to service one, forming > another within that deadline seems feasible, so you only need to have > one in the hardware itself. >=20 > Simple example: you have data in the hardware projected to take a > minimum of 4ms to transmit. Don't form a new aggregate and submit it > to the hardware for 3.5ms. >=20 > I know full well that a "good" estimate is hard, and things like > mu-mimo complicate things. Still, I'd like to get below 20ms of > latency within the driver, and this is one way to get there. For what it=E2=80=99s worth, I=E2=80=99d love to see this. One of the = few arguments for doing soft rate limiting with point-to-point WiFi is = that it=E2=80=99s still possible, when rates are stable, to achieve = lower latency under load than with the new ath9k driver. It would be = nice to see that argument disappear. Solid...