From patchwork Sat Mar 7 15:03:21 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kirsher, Jeffrey T" X-Patchwork-Id: 447593 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 447D8140182 for ; Sun, 8 Mar 2015 02:03:59 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752208AbbCGPDq (ORCPT ); Sat, 7 Mar 2015 10:03:46 -0500 Received: from mga03.intel.com ([134.134.136.65]:52869 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751803AbbCGPDc (ORCPT ); Sat, 7 Mar 2015 10:03:32 -0500 Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga103.jf.intel.com with ESMTP; 07 Mar 2015 07:00:49 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.11,358,1422950400"; d="scan'208";a="537456397" Received: from michaelc-mobl.amr.corp.intel.com (HELO jtkirshe-mobl.amr.corp.intel.com) ([10.252.129.153]) by orsmga003.jf.intel.com with ESMTP; 07 Mar 2015 07:03:09 -0800 From: Jeff Kirsher To: davem@davemloft.net Cc: Jesse Brandeburg , netdev@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com, jogreene@redhat.com, Jeff Kirsher Subject: [net-next 13/15] i40e/i40evf: enable prefetch of Tx descriptors during cleanup Date: Sat, 7 Mar 2015 07:03:21 -0800 Message-Id: <1425740603-11280-14-git-send-email-jeffrey.t.kirsher@intel.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1425740603-11280-1-git-send-email-jeffrey.t.kirsher@intel.com> References: <1425740603-11280-1-git-send-email-jeffrey.t.kirsher@intel.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Jesse Brandeburg Performance can be improved a bit by imitating ixgbe and using prefetch to get us the next Tx descriptor. Change-ID: Ice7ffd4cd0ce87c35295059bdb7972a7f53723aa Signed-off-by: Jesse Brandeburg Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/i40e/i40e_txrx.c | 2 ++ drivers/net/ethernet/intel/i40evf/i40e_txrx.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c index a60b840..f5a50b9 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -770,6 +770,8 @@ static bool i40e_clean_tx_irq(struct i40e_ring *tx_ring, int budget) tx_desc = I40E_TX_DESC(tx_ring, 0); } + prefetch(tx_desc); + /* update budget accounting */ budget--; } while (likely(budget)); diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c index 1c2637b..d9f3db5 100644 --- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c @@ -289,6 +289,8 @@ static bool i40e_clean_tx_irq(struct i40e_ring *tx_ring, int budget) tx_desc = I40E_TX_DESC(tx_ring, 0); } + prefetch(tx_desc); + /* update budget accounting */ budget--; } while (likely(budget));