From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id EF0F8A0471 for ; Tue, 16 Jul 2019 17:29:44 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 8715F2BD5; Tue, 16 Jul 2019 17:29:43 +0200 (CEST) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by dpdk.org (Postfix) with ESMTP id 1A94E1B53; Tue, 16 Jul 2019 17:29:40 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Jul 2019 08:29:39 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,498,1557212400"; d="scan'208";a="319024821" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by orsmga004.jf.intel.com with ESMTP; 16 Jul 2019 08:29:37 -0700 To: Andrew Rybchenko , Bruce Richardson Cc: "A.McLoughlin" , Wenzhuo Lu , Jingjing Wu , Bernard Iremonger , dev@dpdk.org, david.marchand@redhat.com, stable@dpdk.org, Thomas Monjalon , Stephen Hemminger References: <20190712083221.4987-1-aideen.mcloughlin@intel.com> <6dec383f-a559-7036-8ecd-22f11f2c1d5f@solarflare.com> <131f21d3-dd47-4536-655a-0bb7af54ee0e@intel.com> <20190716142823.GA1313@bricha3-MOBL.ger.corp.intel.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH] app/testpmd: fix doubling of 'total TX dropped' X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 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 7/16/2019 4:00 PM, Andrew Rybchenko wrote: > On 7/16/19 5:28 PM, Bruce Richardson wrote: >> On Tue, Jul 16, 2019 at 03:23:03PM +0100, Ferruh Yigit wrote: >>> On 7/16/2019 1:23 PM, Andrew Rybchenko wrote: >>>> On 7/15/19 5:53 PM, Ferruh Yigit wrote: >>>>> On 7/12/2019 9:32 AM, A.McLoughlin wrote: >>>>>> The 'Accumulated forward statistics for all ports' incorrectly displayed >>>>>> double the actual value for 'total_tx_dropped'. This was because 2 >>>>>> lines in the same function both incremented total_tx_dropped every time >>>>>> a packet was dropped. I removed one of these lines to fix this issue. >>>>>> >>>>>> Fixes: 53324971a14e ("app/testpmd: display/clear forwarding stats on demand") >>>>>> Cc: david.marchand@redhat.com >>>>>> Cc: stable@dpdk.org >>>>>> >>>>>> Signed-off-by: A.McLoughlin >>>>>> --- >>>>>> app/test-pmd/testpmd.c | 1 - >>>>>> 1 file changed, 1 deletion(-) >>>>>> >>>>>> diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c >>>>>> index 3ed3523b7..c41bada50 100644 >>>>>> --- a/app/test-pmd/testpmd.c >>>>>> +++ b/app/test-pmd/testpmd.c >>>>>> @@ -1555,7 +1555,6 @@ fwd_stats_display(void) >>>>>> total_recv += stats.ipackets; >>>>>> total_xmit += stats.opackets; >>>>>> total_rx_dropped += stats.imissed; >>>>>> - total_tx_dropped += ports_stats[pt_id].tx_dropped; >>>>>> total_tx_dropped += stats.oerrors; >>>>>> total_rx_nombuf += stats.rx_nombuf; >>>>>> >>>>>> >>>>> >>>>> Hi Aideen, >>>>> >>>>> Indeed 'rte_eth_stats->oerrors' and 'tx_dropped' are different values, >>>>> >>>>> in testpmd, 'TX-total' is taken as "total_xmit + total_tx_dropped", from this >>>>> description it may be fair to say >>>>> "total_tx_dropped = oerrors + tx_dropped" >>>>> >>>>> This is easier to see in HW devices, 'oerrors' is the packets sent to HW but HW >>>>> reported failure for some reason, so these packets not transmitted to the medium. >>>>> 'tx_dropped' is mostly calculated by application, driver returns packets that >>>>> can't able to sent to HW, so application can re-try to send or free them and >>>>> increase 'tx_dropped' counter. >>>>> >>>>> >>>>> The problem is in the virtual drivers, the packets not able to sent are >>>>> calculated as 'oerrors' and tx_burst functions returns the number of the >>>>> successfully sent packets which cause application calculate remaining ones as >>>>> 'tx_dropped' which cause the duplication. >>>> >>>> I don't understand how it is. Tx burst returns a number of owned packets >>>> (either successfully transmitted or internally dropped/freed). If it is >>>> smaller than number of packets in request, other packets are either >>>> retried or calculated as tx_dropped. >>> >>> Virtual PMDs, at least the ones I checked, calculating not sent packets as >>> error, also application calculates them as tx_dropped. >>> >>> Like: >>> https://git.dpdk.org/dpdk/tree/drivers/net/ring/rte_eth_ring.c?h=v19.08-rc1#n97 >>> >> That is probably incorrect to do. Virtual PMDs should behave as real ones >> do as far as possible. I think we should change them to not count as errors >> any that are not handled by the driver, provided those are returned to the >> app. > > I agree with Bruce. It is a bug in ring PMD. If so, too fast attempts to > transmit packets will blow up err_pkts counter. > +1, as far as I can see following PMDs requires fixing: ring kni pcap tap