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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4A65CC636CD for ; Mon, 30 Jan 2023 12:51:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236708AbjA3Mvl (ORCPT ); Mon, 30 Jan 2023 07:51:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44514 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229809AbjA3Mvg (ORCPT ); Mon, 30 Jan 2023 07:51:36 -0500 Received: from smtp-relay-internal-0.canonical.com (smtp-relay-internal-0.canonical.com [185.125.188.122]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F7CB2C67F for ; Mon, 30 Jan 2023 04:51:30 -0800 (PST) Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-internal-0.canonical.com (Postfix) with ESMTPS id 32F0A42103 for ; Mon, 30 Jan 2023 12:51:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1675083088; bh=+3uGoE1lOv0ml5cvNUK29pAUdPjmYWUbapuyqS72mm8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:In-Reply-To; b=P4Enk64JZtEtHS6ge3VUTVEcVkAUhIRCJNdmcuWMXlEag3ooUuwNE2s1/ekkh42sX H93DHNi5Rh5DZWJjRMvtszKHpnIApMIzHFKW6RP8WD8k5qZIf+iZfcQzpBKWm7F6CF Nmn1JrLtYFdANNogoKfKvQVtEVt8+KRLuY+ah6yITxRQCPX0paMtLD80JApOJP4mB2 Qxgxmk3IIfF11WL3Fp0Yr54ctLWLe4Hi0SQcF4m8ZBRCadqWHwJzOyTlS8wHYBKIAn lfoE5rnFESZ7YgZR2BrwOH3hxBXnrjZsnODe7wkpkHqTGssShHhyx0JlHkjJjchFSq AdFBIReGzRPFg== Received: by mail-wm1-f72.google.com with SMTP id h9-20020a1ccc09000000b003db1c488826so9487150wmb.3 for ; Mon, 30 Jan 2023 04:51:28 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=+3uGoE1lOv0ml5cvNUK29pAUdPjmYWUbapuyqS72mm8=; b=ZDlk0Xg9mVWOk+xdK4mNUcKK3J5drmcykt6RLNDIgZtUJOar26CsNAaKchxSP559bS L8B3B1FTAW1YCTAOPnGvrE+9uPnxCmRC1gU6SC2oLGayz0NLX44SjKFrK36h/h0DuVsx UUe2D+hlU1vsZ1InMfmOjbJe/hyNsgqoZqmDFcHyJdZL4L1lFdsqcKbDJQDldtI5253P WQMjKW6J1cXtWYWMd9Dcy7TNRTaaNIHmMFTxnpmT2NWGzMUYxmpjSUhGHEI77qWtqxqK IEGOGWQ754fGaOoslDmRh+nIu6/vqASpYH16qUqCMo/34BfO3nvt4OdVnmeTElNLZGDa DnSw== X-Gm-Message-State: AFqh2kpuFkFB6cOETkb74NQp/ETut1FPTvm79q89lfxjOOjihs3tc7GP BEbh9NrhfUy304bemOuetPAhrQKp5/YBdba6BfdLNmn8eCsvadm+jycXGCSBmwDWLSRtgzW3HoC NZea7CrO9nIVYNMca6tno1vdiTz0oVZgogia7yrtDzA== X-Received: by 2002:a05:600c:4256:b0:3da:1d51:ef9e with SMTP id r22-20020a05600c425600b003da1d51ef9emr48495749wmm.17.1675083086422; Mon, 30 Jan 2023 04:51:26 -0800 (PST) X-Google-Smtp-Source: AMrXdXsAaga7uSr6kkAnFQbEMoEkyVHoPqI6rA+OICQ2N8MLyMCI2NM/vIqr7BZmmZwroNWvfiCX6w== X-Received: by 2002:a05:600c:4256:b0:3da:1d51:ef9e with SMTP id r22-20020a05600c425600b003da1d51ef9emr48495739wmm.17.1675083086235; Mon, 30 Jan 2023 04:51:26 -0800 (PST) Received: from qwirkle ([81.2.157.149]) by smtp.gmail.com with ESMTPSA id m21-20020a05600c161500b003dc522dd25esm5231264wmn.30.2023.01.30.04.51.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Jan 2023 04:51:25 -0800 (PST) Date: Mon, 30 Jan 2023 12:51:23 +0000 From: Andrei Gherzan To: Paolo Abeni Cc: Willem de Bruijn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Shuah Khan , netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] selftests: net: udpgso_bench_tx: Introduce exponential back-off retries Message-ID: References: <20230127181625.286546-1-andrei.gherzan@canonical.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 23/01/30 09:26AM, Paolo Abeni wrote: > On Fri, 2023-01-27 at 17:03 -0500, Willem de Bruijn wrote: > > On Fri, Jan 27, 2023 at 1:16 PM Andrei Gherzan > > wrote: > > > > > > The tx and rx test programs are used in a couple of test scripts including > > > "udpgro_bench.sh". Taking this as an example, when the rx/tx programs > > > are invoked subsequently, there is a chance that the rx one is not ready to > > > accept socket connections. This racing bug could fail the test with at > > > least one of the following: > > > > > > ./udpgso_bench_tx: connect: Connection refused > > > ./udpgso_bench_tx: sendmsg: Connection refused > > > ./udpgso_bench_tx: write: Connection refused > > > > > > This change addresses this by adding routines that retry the socket > > > operations with an exponential back off algorithm from 100ms to 2s. > > > > > > Fixes: 3a687bef148d ("selftests: udp gso benchmark") > > > Signed-off-by: Andrei Gherzan > > > > Synchronizing the two processes is indeed tricky. > > > > Perhaps more robust is opening an initial TCP connection, with > > SO_RCVTIMEO to bound the waiting time. That covers all tests in one > > go. > > Another option would be waiting for the listener(tcp)/receiver(udp) > socket to show up in 'ss' output before firing-up the client - quite > alike what mptcp self-tests are doing. I like this idea. I have tested it and it works as expected with the exeception of: ./udpgso_bench_tx: sendmsg: No buffer space available Any ideas on how to handle this? I could retry and that works. -- Andrei Gherzan