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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 30A10C3A59E for ; Wed, 4 Sep 2019 04:43:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 067EA22CED for ; Wed, 4 Sep 2019 04:43:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=qti.qualcomm.com header.i=@qti.qualcomm.com header.b="P8kXHcZx" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728598AbfIDEnb (ORCPT ); Wed, 4 Sep 2019 00:43:31 -0400 Received: from alexa-out-tai-01.qualcomm.com ([103.229.16.226]:34223 "EHLO alexa-out-tai-01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728515AbfIDEna (ORCPT ); Wed, 4 Sep 2019 00:43:30 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=qti.qualcomm.com; i=@qti.qualcomm.com; q=dns/txt; s=qcdkim; t=1567572209; x=1599108209; h=from:to:date:message-id:references:in-reply-to: content-transfer-encoding:mime-version:subject; bh=DMDQwa1wMgq3WtQtLRk0tX1gDVhgMz6LcVx5a87hHFo=; b=P8kXHcZxs6TDG/bnelMFI5ijqrqhnVXRP9PYzmTneIydX54FwqQciDX0 DYN20LHeSLZaQir0l+NuDNa2T77UdzKJcIXas9ZCVAgNfWATJh8pHzyH9 r+wgjDNQ+l67Gt1fXYqbMTtJqpUO0EZfUiODkY4PhkchpnOLKkXmvEcNj E=; Subject: RE: [PATCH 2/7] ath10k: change max RX bundle size from 8 to 32 for sdio Thread-Topic: [PATCH 2/7] ath10k: change max RX bundle size from 8 to 32 for sdio Received: from ironmsg03-tai.qualcomm.com ([10.249.140.8]) by alexa-out-tai-01.qualcomm.com with ESMTP; 04 Sep 2019 12:43:27 +0800 Received: from aptaiexm02a.ap.qualcomm.com ([10.249.150.11]) by ironmsg03-tai.qualcomm.com with ESMTP/TLS/AES256-SHA; 04 Sep 2019 12:43:23 +0800 Received: from aptaiexm02f.ap.qualcomm.com (10.249.150.16) by aptaiexm02a.ap.qualcomm.com (10.249.150.11) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 4 Sep 2019 12:43:21 +0800 Received: from aptaiexm02f.ap.qualcomm.com ([fe80::4152:1436:e436:faa1]) by aptaiexm02f.ap.qualcomm.com ([fe80::4152:1436:e436:faa1%19]) with mapi id 15.00.1473.005; Wed, 4 Sep 2019 12:43:21 +0800 From: Wen Gong To: Dave Taht , "ath10k@lists.infradead.org" , "linux-wireless@vger.kernel.org" Thread-Index: AQHVYnII1QGsPhG3K0ybAPHFlPgABKca8VbA Date: Wed, 4 Sep 2019 04:43:21 +0000 Message-ID: <259d8d7f8c2a4c428ae14ff211c83c1a@aptaiexm02f.ap.qualcomm.com> References: <1566302108-18219-1-git-send-email-wgong@codeaurora.org> <1566302108-18219-3-git-send-email-wgong@codeaurora.org> <87k1apnyyo.fsf@taht.net> In-Reply-To: <87k1apnyyo.fsf@taht.net> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.249.136.10] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org > -----Original Message----- > From: Dave Taht > Sent: Wednesday, September 4, 2019 12:10 AM > To: Wen Gong ; ath10k@lists.infradead.org; > linux-wireless@vger.kernel.org > Subject: [EXT] Re: [PATCH 2/7] ath10k: change max RX bundle size from 8 t= o > 32 for sdio >=20 >=20 > In terms of deeply grokking what increasing buffering to achieve high > bandwidth on a testbench, vs what it can do to clobber latency in the > real world at low bandwidths, I tend to point folk at: >=20 > https://www.youtube.com/watch?v=3DRb-UnHDw02o&t=3D25m40s >=20 > where I got a whole bunch of hackers to stand up and act like packets > in an aggregating FIFO wifi queue. >=20 > This key section is only 8 minutes long, and I promise, y'all laugh > at least 3 times at the demonstration. >=20 > At the time, also, the ath10k was so overbuffered that on one test > I could try to start 100 flows, and only get five. >=20 > https://lwn.net/Articles/705884/ >=20 > and on my slides: >=20 > https://blog.linuxplumbersconf.org/2016/ocw//system/presentations/3963/ > original/linuxplumbers_wifi_latency-3Nov.pdf >=20 Hi Dave, So your mean is change 8 to 32 will impact latency? It will increase laten= cy of rx? >=20 > 0xFFFEFFFF