From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <0101016ecf3bc6b4-dfb95463-c8ba-4b7b-bdfc-df651bdd3cb1-000000@us-west-2.amazonses.com> Received: from a27-10.smtp-out.us-west-2.amazonses.com (a27-10.smtp-out.us-west-2.amazonses.com [54.240.27.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id BCAEB3B29E for ; Tue, 3 Dec 2019 23:47:12 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=zsmsymrwgfyinv5wlfyidntwsjeeldzt; d=codeaurora.org; t=1575434831; h=From:To:Cc:Subject:References:Date:In-Reply-To:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding; bh=XQopT6az1fhWqK9lODCmlfvuxZoA+ornaljxnXikdhM=; b=ESTzKiZ+9evklu6sZg/wqBgcJ8zyM29o5V5xGMYJzrgQdFfK1R3gatPGekr55oLB HJT8yLzfxjzLzuqtu9wsrb5iWx70dS2KmtLUTXd/Aw0fT7NlwSpSWj3MzB3MZEHnSkc AwPKLV+u+f16l3a92SC2uZUZdgNmvaWnR+TWiJVs= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=gdwg2y3kokkkj5a55z2ilkup5wp5hhxx; d=amazonses.com; t=1575434831; h=From:To:Cc:Subject:References:Date:In-Reply-To:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:Feedback-ID; bh=XQopT6az1fhWqK9lODCmlfvuxZoA+ornaljxnXikdhM=; b=dunTZx9E2YCxD5wQLzxWljeEjR4VRbrsybcOIHmbqLEhdtpfdLp7yrdq8YwdcIuB 0BQ7s6P23zv8MR4Wxfu9h92TNl8YoH+vHOmTdnsp/MwX3TFw6NlFfD/rQfeRv9R7A19 6e5yWZlNQNB21vSpXdELv0fa+18uYx4XNvMq4iZ4= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 92B22C433A2 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=kvalo@codeaurora.org From: Kalle Valo To: Kan Yan Cc: Dave Taht , Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= , Rajkumar Manoharan , Kevin Hayes , Make-Wifi-fast , linux-wireless , Yibo Zhao , John Crispin , Johannes Berg , Lorenzo Bianconi , Felix Fietkau References: <20191115014846.126007-1-kyan@google.com> <8736eiam8f.fsf@toke.dk> <87a78p8rz7.fsf@toke.dk> <87muco5gv5.fsf@toke.dk> <87eexvyoy8.fsf@toke.dk> <878so2m5gp.fsf@nemesis.taht.net> Date: Wed, 4 Dec 2019 04:47:11 +0000 In-Reply-To: (Kan Yan's message of "Tue, 3 Dec 2019 11:02:44 -0800") Message-ID: <0101016ecf3bc6b4-dfb95463-c8ba-4b7b-bdfc-df651bdd3cb1-000000@us-west-2.amazonses.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-SES-Outgoing: 2019.12.04-54.240.27.10 Feedback-ID: 1.us-west-2.CZuq2qbDmUIuT3qdvXlRHZZCpfZqZ4GtG9v3VKgRyF0=:AmazonSES Subject: Re: [Make-wifi-fast] [PATCH v8 0/2] Implement Airtime-based Queue Limit (AQL) 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: Wed, 04 Dec 2019 04:47:13 -0000 Kan Yan writes: > Dave Taht writes: > >> I hope to take a close look at the iwl ax200 chips soon. Unless >> someone beats me to it. Can we get these sort of stats out of it? > > Here is a patch for the trace event I used to get the sojourn time: > https://drive.google.com/open?id=3D1Mq8BO_kcneXBqf3m5Rz5xhEMj9jNbcJv > > Toke H=C3=B8iland-J=C3=B8rgensen writes: > >> While you're running tests, could you do one with the target changed to >> 10ms, just to see what it looks like? Both sojourn time values and >> throughput would be interesting here, of course. > > Apologize for the late reply. Here is the test results with target set to= 10ms. > The trace for the sojourn time: > https://drive.google.com/open?id=3D1MEy_wbKKdl22yF17hZaGzpv3uOz6orTi > > Flent test for 20 ms target time vs 10 ms target time: > https://drive.google.com/open?id=3D1leIWe0-L0XE78eFvlmRJlNmYgbpoH8xZ > > The sojourn time measured during throughput test with a relative good > 5G connection has mean value around 11 ms, pretty close to the 10 ms > target. > > A smaller CoDel "target" time could help reduce latency, but it may > drop packets too aggressively for stations with low data rate and > hurts throughput, as shown in one of the tests with 2.4 GHz client. > > Overall, I think AQL and fq_codel works well, at least with ath10k. > The current target value of 20 ms is a reasonable default. It is > relatively conservative that helps stations with weak signal to > maintain stable throughput. Although, a debugfs entry that allows > runtime adjustment of target value could be useful. Why not make it configurable via nl80211? We should use debugfs only for testing and debugging, not in production builds, and to me the use case for this value sounds like more than just testing. --=20 https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatc= hes