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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 E2D55C2D0DB for ; Fri, 24 Jan 2020 10:34:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BD3ED20708 for ; Fri, 24 Jan 2020 10:34:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730035AbgAXKeh (ORCPT ); Fri, 24 Jan 2020 05:34:37 -0500 Received: from s3.sipsolutions.net ([144.76.43.62]:38080 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726293AbgAXKeh (ORCPT ); Fri, 24 Jan 2020 05:34:37 -0500 Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.93) (envelope-from ) id 1iuwIK-0011ZT-Cz; Fri, 24 Jan 2020 11:34:32 +0100 Message-ID: Subject: Re: debugging TCP stalls on high-speed wifi From: Johannes Berg To: Krishna Chaitanya Cc: Eric Dumazet , Neal Cardwell , Toke =?ISO-8859-1?Q?H=F8iland-J=F8rgensen?= , linux-wireless , Netdev Date: Fri, 24 Jan 2020 11:34:31 +0100 In-Reply-To: (sfid-20191213_101015_988941_7C64060E) References: <14cedbb9300f887fecc399ebcdb70c153955f876.camel@sipsolutions.net> <99748db5-7898-534b-d407-ed819f07f939@gmail.com> (sfid-20191213_101015_988941_7C64060E) Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.34.2 (3.34.2-1.fc31) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Fri, 2019-12-13 at 14:40 +0530, Krishna Chaitanya wrote: > > Maybe try 'reno' instead of 'cubic' to see if congestion control is > being too careful? I played around with this a bit now, but apart from a few outliers, the congestion control algorithm doesn't have much effect. The outliers are * vegas with ~120 Mbps * nv with ~300 Mbps * cdg with ~600 Mbps All the others from my list (reno cubic bbr bic cdg dctcp highspeed htcp hybla illinois lp nv scalable vegas veno westwood yeah) are within 50 Mbps or so from each other (around 1.45Gbps). johannes