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=-2.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_2 autolearn=no 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 5F012C2D0CE for ; Tue, 21 Jan 2020 18:45:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3271B24655 for ; Tue, 21 Jan 2020 18:45:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="SQ36kL18" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729134AbgAUSpF (ORCPT ); Tue, 21 Jan 2020 13:45:05 -0500 Received: from mail-qv1-f53.google.com ([209.85.219.53]:42399 "EHLO mail-qv1-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728186AbgAUSpF (ORCPT ); Tue, 21 Jan 2020 13:45:05 -0500 Received: by mail-qv1-f53.google.com with SMTP id dc14so1953612qvb.9 for ; Tue, 21 Jan 2020 10:45:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=message-id:subject:from:to:date:mime-version :content-transfer-encoding; bh=FeOFghGrmcA+YWk9xGzeEU37IWVrqXbmdpbExs/ASjI=; b=SQ36kL18YUHUZRrUgufKNNWAh0ZW+dNkqA15VEdK+O6monhuli3rGIHJYU7JV44Cxt Q9+D+9r3E9FGZ4g7wtWlLNpjzHUfu/QIBCXarrkl88G/hCBsoAhnLfttOlg0/0EzkYrK lwJVJ72r6vJ9VVfaApayYsxajzOAHuDODZO1N1fjr8xxZjMtKRuow6jd4zSdMLST2kv2 j7l4gvOdbbpOPPFeS0cE/WpJ7usO4llBjN4rThR9sAeQyiYS8BYK0W7Vv5vU7ljKDlrD WKuknVrThHPmr9YoDI7WUbbXkXY2As5o6dhiMz7uRZ3DAGsRQ/b+DauzsxYPoXncthFS mXdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:subject:from:to:date:mime-version :content-transfer-encoding; bh=FeOFghGrmcA+YWk9xGzeEU37IWVrqXbmdpbExs/ASjI=; b=Urp4U/8Jl2fQP9XPcsgGppxvxkQBbKMq+WJ8v9VmwP4L5Toj2n13gsspeQWjwU9SE2 IiJxE9FYfgo+hOkJ/wcrhsc6XjeFP6KjjxtpWzT0/eeIYvtOCi4D55uy/tPm4kDTOJsv 9je8dEqJK9jwwuIUuhFyhUEi6wt5GSnmlcxzUDg9rCVEBWUNLJA/wx8IaRcW6I7bzyYt mc8LXGrHIDsRQGHNpUiWZoXdErfUKU9DD85SpGRhaz38iu9W8izNjNFI/iEl1fA8WxkQ 9yoymGcV/AQwwhEtiYRYmUb+cwKTQQR2oknos6+YcNs1A4VAGpNHp7cuGSFutsLbLiC5 P5+g== X-Gm-Message-State: APjAAAX9me7oHlWbeHWJw0Ly/CMU66FBPKScf8MGj15uKwUuzS8mqDEZ wRI9HKpfyItE1fsLsBUkhsU47frc X-Google-Smtp-Source: APXvYqxxWu8gsCH8xU/NsCtjYKDlk3H6/5+1S5b3+cgjmKJqtZyDvNG+CdIJYeTGvUUCKS2WZO0yKw== X-Received: by 2002:a05:6214:94b:: with SMTP id dn11mr6171456qvb.12.1579632304071; Tue, 21 Jan 2020 10:45:04 -0800 (PST) Received: from [192.168.0.10] (dhcp-108-168-58-21.cable.user.start.ca. [108.168.58.21]) by smtp.gmail.com with ESMTPSA id b24sm19540670qto.71.2020.01.21.10.45.02 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 21 Jan 2020 10:45:03 -0800 (PST) Message-ID: <1579632300.17789.18.camel@gmail.com> Subject: RT5370 performance issues From: Marlon Smith To: linux-wireless@vger.kernel.org Date: Tue, 21 Jan 2020 13:45:00 -0500 Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Hi everyone, I'm having some trouble with an RT5370 Wi-Fi module on an embedded Linux system. With just one of these modules connected to an access point, performance is around 30 Mbit/s. However, as soon as a second module is connected to the access point, performance drops to about 3 Mbit/s. With debug output enabled, there are many copies of this message: wlan0: release an RX reorder frame due to timeout on earlier frames which seems to be related to MDPU aggregation. So, I went into rt2800lib.c in the function rt2800_ampdu_action and added the line ret = -ENOTSUPP; to disable support for RX frame aggregation: switch (action) { case IEEE80211_AMPDU_RX_START: case IEEE80211_AMPDU_RX_STOP: ret = -ENOTSUPP; ... After that change, debug output shows: wlan0: AddBA Req buf_size=64 for 00:ad:24:ff:6c:a0 wlan0: Rx A-MPDU request on 00:ad:24:ff:6c:a0 tid 0 result -524 and performance seems to be maybe slightly faster but not by much. I'm using backports, and have tried with version 5.3-rc4 and  4.14-rc2. I've also tried several versions of the device firmware file rt2870.bin; 0.36, 0.33, and 0.22. Many thanks for any ideas you can offer. Marlon