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=-5.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 37AC9C3F68F for ; Sat, 1 Feb 2020 18:20:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 10F21206E3 for ; Sat, 1 Feb 2020 18:20:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="EuhES7IO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726598AbgBASUN (ORCPT ); Sat, 1 Feb 2020 13:20:13 -0500 Received: from mail-pg1-f182.google.com ([209.85.215.182]:44668 "EHLO mail-pg1-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726195AbgBASUM (ORCPT ); Sat, 1 Feb 2020 13:20:12 -0500 Received: by mail-pg1-f182.google.com with SMTP id x7so5394033pgl.11; Sat, 01 Feb 2020 10:20:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=sc/wmcgsvsqqJPAqusNZRRjiSGWwsUdCmJftv69qgL4=; b=EuhES7IO0EreL19++LRkzUvPxKaR8b5xehcp3NlephRQVM3qIND/gc0ki3gfZBvfIt DKDLAUqS+7FXvPZvfj/i7q7WuzfR/JPUy+ThnRpliusNT31MCODc5p2ucnHDSBkeeZ73 FuGtJ+GLpL4hiSCZdImSZRr2tnrC7cp/HD1kgSN0COXPS6kTwrW8oLZw01ELRQZgpZtQ NypKSvTDZd5q9po/8QwrQKsCWZ9nU6fOFjFtv85xKr3wi0kHGviGZStAvNPy5GqJBqoH l3bscRRtxVavDE2dUHCaycEON+TfRRZrGmRXupx9P+Y3tXpbKzdyA5NUv5yKs7TWUS7i pxsw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=sc/wmcgsvsqqJPAqusNZRRjiSGWwsUdCmJftv69qgL4=; b=Uvzg1em9FJSD8KUS/fdikVuAg7lLY0tgaSresGyEuJVQ4q5UozE5g8hr0TdBPYepP1 gGOpycE3t+9YJ9cUWRAPCeXOd2Tb+GeVIX+QiZUxf1KzgCuhN2K22mwb+MGxOWlAX1Ln NXQwmkFVABZusbRx9aNlZpzBKkj77sbeSsX25qvvjqPoC3mMa4XbkFDfiXlTkhCMM9KB 9MnWE3y6FQrLd5qOA8wUy8Z3NesAjVwkjRDfAJ89aSnYUR+ng7YCVFtWYE9lFLiAUHSH uEcEtqDEna0hHZCik/Lotjw0sI47fwH0qeH/m9Cgg5OLkw5tRdQwgO8/bQ7s/Q2glZBz 0BCA== X-Gm-Message-State: APjAAAWWwTpoTkysQuaGXIqVB2RvPVtlLxWH6RkeRGYa6iw8tABupzfi 9PskV9IQhM4J/z6NMe5TjXc= X-Google-Smtp-Source: APXvYqzf/T5Qq1zGlU3DeMkQFmTkZcoWE6uF1OlLdGiQlMxoUc/+8hBa4DPpcKCdceRASeaqqubUlg== X-Received: by 2002:a62:1d1:: with SMTP id 200mr17043051pfb.184.1580581211911; Sat, 01 Feb 2020 10:20:11 -0800 (PST) Received: from [192.168.86.235] (c-73-241-150-58.hsd1.ca.comcast.net. [73.241.150.58]) by smtp.gmail.com with ESMTPSA id p4sm2989884pgh.14.2020.02.01.10.20.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 01 Feb 2020 10:20:10 -0800 (PST) Subject: Re: [PATCH v2 2/2] selftests: net: Add FIN_ACK processing order related latency spike test To: sj38.park@gmail.com, edumazet@google.com Cc: davem@davemloft.net, aams@amazon.com, ncardwell@google.com, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, shuah@kernel.org, ycheng@google.com, David.Laight@ACULAB.COM, SeongJae Park References: <20200201071859.4231-1-sj38.park@gmail.com> <20200201071859.4231-3-sj38.park@gmail.com> From: Eric Dumazet Message-ID: <0fc6654c-c938-3920-0097-cddc34474855@gmail.com> Date: Sat, 1 Feb 2020 10:20:08 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <20200201071859.4231-3-sj38.park@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/31/20 11:18 PM, sj38.park@gmail.com wrote: > From: SeongJae Park > > This commit adds a test for FIN_ACK process races related reconnection > latency spike issues. The issue has described and solved by the > previous commit ("tcp: Reduce SYN resend delay if a suspicous ACK is > received"). > > The test program is configured with a server and a client process. The > server creates and binds a socket to a port that dynamically allocated, > listen on it, and start a infinite loop. Inside the loop, it accepts > connection, reads 4 bytes from the socket, and closes the connection. > The client is constructed as an infinite loop. Inside the loop, it > creates a socket with LINGER and NODELAY option, connect to the server, > send 4 bytes data, try read some data from server. After the read() > returns, it measure the latency from the beginning of this loop to this > point and if the latency is larger than 1 second (spike), print a > message. > > Signed-off-by: SeongJae Park Reviewed-by: Eric Dumazet