From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by dpdk.org (Postfix) with ESMTP id B56298D8B for ; Thu, 4 Feb 2016 13:45:35 +0100 (CET) Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga101.fm.intel.com with ESMTP; 04 Feb 2016 04:45:32 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.22,395,1449561600"; d="scan'208";a="876883532" Received: from shvmail01.sh.intel.com ([10.239.29.42]) by orsmga001.jf.intel.com with ESMTP; 04 Feb 2016 04:45:27 -0800 Received: from shecgisg004.sh.intel.com (shecgisg004.sh.intel.com [10.239.29.89]) by shvmail01.sh.intel.com with ESMTP id u14CjPmm000523; Thu, 4 Feb 2016 20:45:25 +0800 Received: from shecgisg004.sh.intel.com (localhost [127.0.0.1]) by shecgisg004.sh.intel.com (8.13.6/8.13.6/SuSE Linux 0.8) with ESMTP id u14CjMil000837; Thu, 4 Feb 2016 20:45:24 +0800 Received: (from heshaope@localhost) by shecgisg004.sh.intel.com (8.13.6/8.13.6/Submit) id u14CjMXk000833; Thu, 4 Feb 2016 20:45:22 +0800 From: Shaopeng He To: dev@dpdk.org Date: Thu, 4 Feb 2016 20:45:20 +0800 Message-Id: <1454589920-801-1-git-send-email-shaopeng.he@intel.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1453960023-31402-1-git-send-email-shaopeng.he@intel.com> References: <1453960023-31402-1-git-send-email-shaopeng.he@intel.com> Subject: [dpdk-dev] [PATCH v2] fm10k: fix switch manager high CPU usage X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Feb 2016 12:45:36 -0000 fm10k switch core uses source MAC + VID + SGLORT to do look up in MAC table. If no match, an exception interrupt will be sent to the switch manager. Too much of this kind of exception interrupts cause switch manager side high CPU usage. To reproduce this issue, one DPDK testpmd runs on a server with one fm10k NIC, mac forwards test traffic from one of fm10k ports to another port. The CPU usage for the switch manager will go up to about 20% for test traffic rate at 10G bps, comparing to near 0% for no test traffic. This patch fixes this issue. A default SGLORT is assigned to each TX queue. This default value works for non-VMDq mode and current VMDq example. For advanced VMDq usage, e.g. different source MAC address for different TX queue, FTAG forwarding function could be used to change this default SGLORT value. Signed-off-by: Shaopeng He --- drivers/net/fm10k/fm10k_ethdev.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/fm10k/fm10k_ethdev.c b/drivers/net/fm10k/fm10k_ethdev.c index e4aed94..f6eb05d 100644 --- a/drivers/net/fm10k/fm10k_ethdev.c +++ b/drivers/net/fm10k/fm10k_ethdev.c @@ -675,6 +675,9 @@ fm10k_dev_tx_init(struct rte_eth_dev *dev) FM10K_WRITE_REG(hw, FM10K_TDBAH(i), base_addr >> (CHAR_BIT * sizeof(uint32_t))); FM10K_WRITE_REG(hw, FM10K_TDLEN(i), size); + + /* assign default SGLORT for each TX queue */ + FM10K_WRITE_REG(hw, FM10K_TX_SGLORT(i), hw->mac.dglort_map); } /* set up vector or scalar TX function as appropriate */ -- 1.9.3