From patchwork Mon Sep 16 13:09:47 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Yibo Zhao X-Patchwork-Id: 11147025 X-Patchwork-Delegate: johannes@sipsolutions.net Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id ECD1214DB for ; Mon, 16 Sep 2019 13:10:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CA77C214DE for ; Mon, 16 Sep 2019 13:10:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="eRSc9AkU"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="pN7h8XF8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728014AbfIPNKg (ORCPT ); Mon, 16 Sep 2019 09:10:36 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:44308 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728004AbfIPNKg (ORCPT ); Mon, 16 Sep 2019 09:10:36 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id C1DDD61528; Mon, 16 Sep 2019 13:10:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1568639434; bh=5ZC6jmwiMy7decVcU1F89bZb8lrRdZ+ifQlFcir8cq8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eRSc9AkUFFNKdZbxqnI6DWI0DdnM7iYGtLcjPkPnnG65I9DwjAk8mZAdRH5a195Wg VnXHMxVy4+Ihr+UerynjaQ8xIkkzZ7QYhlrrUun4JoaQeuAl/hM47rLpO1a97zCttc BA/5hvknP86RXOnfakR5Aspm9l34PxOjSDltPttA= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=ALL_TRUSTED,BAYES_00, DKIM_INVALID,DKIM_SIGNED,SPF_NONE autolearn=no autolearn_force=no version=3.4.0 Received: from ybzhao-HP-Z230-SFF-Workstation.ap.qualcomm.com (unknown [180.166.53.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: yiboz@codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id EDDF5611FA; Mon, 16 Sep 2019 13:10:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1568639433; bh=5ZC6jmwiMy7decVcU1F89bZb8lrRdZ+ifQlFcir8cq8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pN7h8XF8UrO7qWE3gKv16d9m80IWGVDqxwMmg/BEL+YyLEpD99X/bLmU/a6O+uCcT pJ3m0EY1bxAThNrxcuiBC6rwNrl77mG4bF7+JUsg1Yned5KyrrARMhbFKNfHyTJVwD s0YflXUnBaPt7W23A+cDz7RdEqqnmdTTg8f/oWjc= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org EDDF5611FA Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=yiboz@codeaurora.org From: Yibo Zhao To: ath10k@lists.infradead.org Cc: linux-wireless@vger.kernel.org, Yibo Zhao , =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= Subject: [PATCH 3/4] mac80211: fix low throughput in push pull mode Date: Mon, 16 Sep 2019 21:09:47 +0800 Message-Id: <1568639388-27291-3-git-send-email-yiboz@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1568639388-27291-1-git-send-email-yiboz@codeaurora.org> References: <1568639388-27291-1-git-send-email-yiboz@codeaurora.org> MIME-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org If station is ineligible for transmission in ieee80211_txq_may_transmit(), no packet will be delivered to FW. During the tests in push-pull mode with many clients, after several seconds, not a single station is an eligible candidate for transmission since global time is smaller than all the station's virtual airtime. As a consequence, the Tx has been blocked and throughput is quite low. To avoid this situation to occur in push-pull mode, the new proposal is: - Increase the airtime grace period a little more to reduce the unexpected sync - If global virtual time is less than the virtual airtime of any station, sync it to the airtime of first station in the red-black tree - Round the division result since the process of global virtual time involves the division calculation Co-developed-by: Yibo Zhao Signed-off-by: Yibo Zhao Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: Yibo Zhao Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: B <...> Signed-off-by: A <...> --- net/mac80211/sta_info.c | 3 ++- net/mac80211/sta_info.h | 2 +- net/mac80211/tx.c | 16 +++++++++++++++- 3 files changed, 18 insertions(+), 3 deletions(-) diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index 9d01fdd..feac975 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -1852,7 +1852,8 @@ void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid, weight_sum = local->airtime_weight_sum[ac] ?: sta->airtime_weight; - local->airtime_v_t[ac] += airtime / weight_sum; + /* Round the calculation of global vt */ + local->airtime_v_t[ac] += (airtime + (weight_sum >> 1)) / weight_sum; sta->airtime[ac].v_t += airtime / sta->airtime_weight; ieee80211_resort_txq(&local->hw, txq); diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h index 5c1cac9..5055f94 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -130,7 +130,7 @@ enum ieee80211_agg_stop_reason { /* Debugfs flags to enable/disable use of RX/TX airtime in scheduler */ #define AIRTIME_USE_TX BIT(0) #define AIRTIME_USE_RX BIT(1) -#define AIRTIME_GRACE 500 /* usec of grace period before reset */ +#define AIRTIME_GRACE 2000 /* usec of grace period before reset */ struct airtime_info { u64 rx_airtime; diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 42ca010..60cf569 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -3867,15 +3867,29 @@ bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, struct ieee80211_txq *txq) { struct ieee80211_local *local = hw_to_local(hw); - struct txq_info *txqi = to_txq_info(txq); + struct txq_info *first_txqi, *txqi = to_txq_info(txq); + struct rb_node *node = NULL; struct sta_info *sta; u8 ac = txq->ac; + first_txqi = NULL; lockdep_assert_held(&local->active_txq_lock[ac]); if (!txqi->txq.sta) return true; + node = rb_first_cached(&local->active_txqs[ac]); + if (node) { + first_txqi = container_of(node, struct txq_info, + schedule_order); + if (first_txqi->txq.sta) { + sta = container_of(first_txqi->txq.sta, + struct sta_info, sta); + if (local->airtime_v_t[ac] < sta->airtime[ac].v_t) + local->airtime_v_t[ac] = sta->airtime[ac].v_t; + } + } + sta = container_of(txqi->txq.sta, struct sta_info, sta); return (sta->airtime[ac].v_t <= local->airtime_v_t[ac]); }