From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 82E3CC10F14 for ; Tue, 8 Oct 2019 17:11:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5AC35206C2 for ; Tue, 8 Oct 2019 17:11:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=nbd.name header.i=@nbd.name header.b="HpxjrR2z" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727876AbfJHRLn (ORCPT ); Tue, 8 Oct 2019 13:11:43 -0400 Received: from nbd.name ([46.4.11.11]:40302 "EHLO nbd.name" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726138AbfJHRLm (ORCPT ); Tue, 8 Oct 2019 13:11:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=nbd.name; s=20160729; h=Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: MIME-Version:Content-Type:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=pQj+MbErxLF/AoTx92UNgwkNq1oEtPrBNHakCtTqRfk=; b=HpxjrR2zpEKmrrG4W6DWL49zIB 74C4ADZpN35K3Dlui72PtFXAbGO0SQMgnb7ukw9t18niNhvWvfg2ohokb4Bgi1mO9lwqfu8Ust/A7 LrBXJQPwDAnni5yte5E1OItN5hf27R5FCB6CKr8rmh3Tj4UefprteV+HE+AWrKmYv5nQ=; Received: from p54ae92e8.dip0.t-ipconnect.de ([84.174.146.232] helo=maeck.local) by ds12 with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1iHt1Q-0006Pv-5Z; Tue, 08 Oct 2019 19:11:40 +0200 Received: by maeck.local (Postfix, from userid 501) id 778D66AF2799; Tue, 8 Oct 2019 19:11:39 +0200 (CEST) From: Felix Fietkau To: linux-wireless@vger.kernel.org Cc: johannes@sipsolutions.net Subject: [PATCH v2 1/3] mac80211: minstrel: remove divisions in tx status path Date: Tue, 8 Oct 2019 19:11:37 +0200 Message-Id: <20191008171139.96476-1-nbd@nbd.name> X-Mailer: git-send-email 2.17.0 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Use a slightly different threshold for downgrading spatial streams to make it easier to calculate without divisions. Slightly reduces CPU overhead. Signed-off-by: Felix Fietkau --- net/mac80211/rc80211_minstrel.c | 3 +-- net/mac80211/rc80211_minstrel_ht.c | 10 ++++------ 2 files changed, 5 insertions(+), 8 deletions(-) diff --git a/net/mac80211/rc80211_minstrel.c b/net/mac80211/rc80211_minstrel.c index ee86c3333999..f73017e08111 100644 --- a/net/mac80211/rc80211_minstrel.c +++ b/net/mac80211/rc80211_minstrel.c @@ -289,8 +289,7 @@ minstrel_tx_status(void *priv, struct ieee80211_supported_band *sband, if (mi->sample_deferred > 0) mi->sample_deferred--; - if (time_after(jiffies, mi->last_stats_update + - (mp->update_interval * HZ) / 1000)) + if (time_after(jiffies, mi->last_stats_update + mp->update_interval)) minstrel_update_stats(mp, mi); } diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c index 0ef2633349b5..21c74b200269 100644 --- a/net/mac80211/rc80211_minstrel_ht.c +++ b/net/mac80211/rc80211_minstrel_ht.c @@ -970,23 +970,21 @@ minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband, */ rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]); if (rate->attempts > 30 && - MINSTREL_FRAC(rate->success, rate->attempts) < - MINSTREL_FRAC(20, 100)) { + rate->success < rate->attempts / 4) { minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true); update = true; } rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]); if (rate2->attempts > 30 && - MINSTREL_FRAC(rate2->success, rate2->attempts) < - MINSTREL_FRAC(20, 100)) { + rate2->success < rate2->attempts / 4) { minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false); update = true; } } if (time_after(jiffies, mi->last_stats_update + - (mp->update_interval / 2 * HZ) / 1000)) { + mp->update_interval / 2)) { update = true; minstrel_ht_update_stats(mp, mi, true); } @@ -1666,7 +1664,7 @@ minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) mp->has_mrr = true; mp->hw = hw; - mp->update_interval = 100; + mp->update_interval = HZ / 10; #ifdef CONFIG_MAC80211_DEBUGFS mp->fixed_rate_idx = (u32) -1; -- 2.17.0