From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 5D36FA0C49; Tue, 15 Jun 2021 10:14:37 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id E65E04067A; Tue, 15 Jun 2021 10:14:36 +0200 (CEST) Received: from shelob.oktetlabs.ru (shelob.oktetlabs.ru [91.220.146.113]) by mails.dpdk.org (Postfix) with ESMTP id 61BAE40140 for ; Tue, 15 Jun 2021 10:14:35 +0200 (CEST) Received: from [192.168.38.17] (aros.oktetlabs.ru [192.168.38.17]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by shelob.oktetlabs.ru (Postfix) with ESMTPSA id D2CF97F519; Tue, 15 Jun 2021 11:14:34 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 shelob.oktetlabs.ru D2CF97F519 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=oktetlabs.ru; s=default; t=1623744874; bh=uvOzRRFiQaWifAJv4yq1hxHIb1J5qrTnqW3xAKCELFg=; h=Subject:To:Cc:References:From:Date:In-Reply-To; b=atL+OMkJAbm74GBtPnkwWjk9knyS/nDr0yHcSaWk8yhJSKOhnULy8mOd5xHRRj0Kg S9B5ig37TUdr8visz/MxJL/gVKAMYxgvSAaFvrz4Ndah87KkzezMSkOFh8DnGPgAE5 dDaCuJApHOre28y8erxhmJk69xcBGhetPe1updqA= To: Ferruh Yigit , "Li, Xiaoyun" Cc: "dev@dpdk.org" , Bruce Richardson References: <20210527162452.1568351-1-andrew.rybchenko@oktetlabs.ru> <1f419fbb-b951-1a84-3329-97701c32c956@oktetlabs.ru> <87dd3fd0-9dab-8079-d135-50d966d6a5cd@intel.com> <2876ce81-7dfc-5e02-2f4a-9861dab1f877@oktetlabs.ru> <11e9bea3-0d44-f55e-51e2-a6afc4b4c1a3@intel.com> From: Andrew Rybchenko Organization: OKTET Labs Message-ID: <44643b14-0d89-1f8b-e60f-1bc13dfa3cd2@oktetlabs.ru> Date: Tue, 15 Jun 2021 11:14:34 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: <11e9bea3-0d44-f55e-51e2-a6afc4b4c1a3@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-dev] [PATCH] app/testpmd: send failure logs to stderr X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 6/15/21 10:59 AM, Ferruh Yigit wrote: > On 6/14/2021 5:56 PM, Andrew Rybchenko wrote: >> On 6/11/21 1:35 PM, Ferruh Yigit wrote: >>> On 6/11/2021 10:19 AM, Andrew Rybchenko wrote: >>>> On 6/11/21 5:06 AM, Li, Xiaoyun wrote: >>>>> Hi >>>>> -----Original Message----- >>>>> From: Andrew Rybchenko >>>>> Sent: Friday, May 28, 2021 00:25 >>>>> To: Li, Xiaoyun >>>>> Cc: dev@dpdk.org >>>>> Subject: [PATCH] app/testpmd: send failure logs to stderr >>>>> >>>>> Running with stdout suppressed or redirected for further processing is very >>>>> confusing in the case of errors. >>>>> >>>>> Signed-off-by: Andrew Rybchenko >>>>> --- >>>>> >>>>> This patch looks good to me. >>>>> But what do you think about make it as a fix and backport to stable branches? >>>>> Anyway works for me. >>>> >>>> I have no strong opinion on the topic. >>>> >>>> @Ferruh, what do you think? >>>> >>> >>> Same here, no strong opinion. >>> Sending errors to 'stderr' looks correct thing to do, but changing behavior in >>> the LTS may cause some unexpected side affect, if it is scripted and testpmd >>> output is parsed etc... For this possibility I would wait for the next LTS. >> >> So, I guess all agree that backporting to LTS is a bad idea because of >> behaviour change. >> >> As I said in a sub-thread I tend to apply in v21.08 since it is a right >> thing to do like a fix, but the fix is not that required to be >> backported to change behaviour of LTS releases. >> >>> And because of same reason perhaps a release note can be added. >> >> I'll make v2 with release notes added. Good point. >> >>> Also there is 'TESTPMD_LOG' macro for logs in testpmd, (as well as 'RTE_LOG' >>> macro), I don't know if we should switch all logs, including 'printf', to >>> 'TESTPMD_LOG' macro? >>> Later stdout/sderr can be managed in rte_log level, instead of any specific >>> logic for the testpmd. >> >> I think fprintf() is a better option for debug tool, since its >> messages should not go to syslog etc. It should go to stdout/stderr >> regardless of logging configuration and log level settings. >> > > Why application should not take log configuration and log level settings into > account? I think this is a feature we can benefit. For me it sounds like an extra way to shoot its own leg. > And for not logging to syslog, I think it is DPDK wide concern, not specific to > testpmd, we should have way to say don't log to syslog or only log error to > syslog etc.. When it is done, using 'TESTPMD_LOG' enables benefiting from that. Logging configuration should be flexible to support various logging backends. IMHO, we don't need the flexibility here. testpmd is a command-line test application and errors should simply go to stderr. That's it. Since the result is the same in both ways, my opinion is not strong, I'm just trying to explain why I slightly prefer suggested way. I can switch to TESTPMD_LOG() (or define TESTPMD_ERR() and use it) easily. I just need maintainers decision on it. >>> Even there was a defect for this in the rte_log level, that logs should go to >>> stderr: https://bugs.dpdk.org/show_bug.cgi?id=8 >>> >>> >>>>> Acked-by: Xiaoyun Li >>>> >>