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 88BD5A0530; Wed, 12 Feb 2020 10:00:06 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id A335F2629; Wed, 12 Feb 2020 10:00:05 +0100 (CET) Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by dpdk.org (Postfix) with ESMTP id 520611F28; Wed, 12 Feb 2020 10:00:03 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 12 Feb 2020 01:00:02 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,428,1574150400"; d="scan'208";a="313341527" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.20]) ([10.237.221.20]) by orsmga001.jf.intel.com with ESMTP; 12 Feb 2020 00:59:50 -0800 To: Slava Ovsiienko , "dev@dpdk.org" Cc: Thomas Monjalon , "bernard.iremonger@intel.com" , "stable@dpdk.org" References: <1581267759-698-1-git-send-email-viacheslavo@mellanox.com> <15cb05eb-1d32-4d81-320b-36e4e8e76ab5@intel.com> From: Ferruh Yigit Autocrypt: addr=ferruh.yigit@intel.com; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH] app/testpmd: fix txonly flow generation entropy 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 2/11/2020 7:57 PM, Slava Ovsiienko wrote: > Hi, Ferruh > >> -----Original Message----- >> From: Ferruh Yigit >> Sent: Monday, February 10, 2020 16:02 >> To: Slava Ovsiienko ; dev@dpdk.org >> Cc: Thomas Monjalon ; >> bernard.iremonger@intel.com; stable@dpdk.org >> Subject: Re: [dpdk-stable] [PATCH] app/testpmd: fix txonly flow generation >> entropy >> >> On 2/9/2020 5:02 PM, Viacheslav Ovsiienko wrote: >>> The testpmd application in txonly forwarding mode has an option to >>> generate the packet flows by varying the destination IP address. >>> The patch increments the IP for each packet sent, this improves the >>> entropy and RSS distibution on the peer receiving size is getting more >>> uniform. >> >> The IP address already incremented for each packet sent [1], I can't see what >> this patch adds. > > Not exactly, that commit increments the ip_var local variable only. > On the next call ip_var is assigned from thread local storage variable > ip_var = RTE_PER_LCORE(_ip_var) - and increment is lost, it is supposed to be a bug. > We have the bursts of packets with the same IPs. Ahh, current code assumes the 'pkt_burst_prepare()' done as burst. And tries to save the increment to thread local storage in 'pkt_burst_transmit()', but since 'pkt_burst_prepare()' is per packet, this logic doesn't work. And it looks like that logic was correct when implemented, but broken during refactoring, can you please update fixes line accordingly: Fixes: 01b645dcff7f ("app/testpmd: move txonly prepare in separate function") > > My patch stores the incremented value in the local storage variable. It is double checked, > after applying the patch we see the more fair RSS distribution on receiving peer. > > With best regards, Slava > >> >> [1] >> https://eur03.safelinks.protection.outlook.com/?url=http%3A%2F%2Flxr.dpdk. >> org%2Fdpdk%2Fv19.11%2Fsource%2Fapp%2Ftest- >> pmd%2Ftxonly.c%23L208&data=02%7C01%7Cviacheslavo%40mellanox.co >> m%7C6a5be2d6ecdd4c487e7908d7ae31dc95%7Ca652971c7d2e4d9ba6a4d149 >> 256f461b%7C0%7C0%7C637169401491712071&sdata=QMXvKlSVy3vAUMz >> Fzj%2ByRKKWUcVToR3hlX8S3a7V21I%3D&reserved=0 >> >> >> btw, for reference the option mentioned is "--txonly-multi-flow" and it has >> been added with: >> commit: 82010ef55e7c ("app/testpmd: make txonly mode generate multiple >> flows") >> > Mmm, yes. My patch refers exactly to the this. Sorry, I do not understand your comment, > could you, please, clarify what do you mean? Just noting down for record. > > With best regards, Slava >