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 7EA9EA0471 for ; Tue, 16 Jul 2019 16:23:10 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 438532BBE; Tue, 16 Jul 2019 16:23:09 +0200 (CEST) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by dpdk.org (Postfix) with ESMTP id DF51114E8; Tue, 16 Jul 2019 16:23:07 +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 orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Jul 2019 07:23:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,498,1557212400"; d="scan'208";a="319007004" 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 07:23:03 -0700 To: Andrew Rybchenko , "A.McLoughlin" , Wenzhuo Lu , Jingjing Wu , Bernard Iremonger Cc: 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> 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: <6dec383f-a559-7036-8ecd-22f11f2c1d5f@solarflare.com> 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 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 > >> In virtual drivers we need to give a decision, if free the wrong packets and >> increase the 'oerrors' or return packets backs to application without increasing >> the 'oerrors', so that application can try to do something with packets or free >> them increasing 'tx_dropped'. >> >> @David, @Andrew, do you have a suggestion? >