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 E825F3B5 for ; Sat, 21 Jan 2017 00:10:30 +0100 (CET) Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga101.fm.intel.com with ESMTP; 20 Jan 2017 15:10:29 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,260,1477983600"; d="scan'208";a="811448960" Received: from dsu-linux32.sc.intel.com (HELO localhost.localdomain) ([143.183.85.58]) by FMSMGA003.fm.intel.com with ESMTP; 20 Jan 2017 15:10:29 -0800 From: David Su To: dev@dpdk.org Cc: David Su Date: Fri, 20 Jan 2017 15:10:25 -0800 Message-Id: <1484953825-3203-1-git-send-email-david.w.su@intel.com> X-Mailer: git-send-email 1.7.0.4 Subject: [dpdk-dev] [PATCH] net/ixgbe: keep interrupt throttling disabled 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: , X-List-Received-Date: Fri, 20 Jan 2017 23:10:31 -0000 The code being removed would enable time-based interrupt throttling for the first MSI-X interrupt vector. This would throttle link status change interrupts for NICs bound to vfio_pci driver; but for igb_uio driver, rx queue 0 interrupts would be throttled. This resulted in inconsistent latencies in a DPDK interrupt mode packet forwarding application between the 2 drivers. We'd like DPDK interrupt mode applications to be awaken by inbound packet interrupts as soon as they are received regardless of interrupt interval, interrupt throttling should be kept disabled. Signed-off-by: David Su --- drivers/net/ixgbe/ixgbe_ethdev.c | 2 -- 1 files changed, 0 insertions(+), 2 deletions(-) diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c index bdf4e2b..fdfb7a6 100644 --- a/drivers/net/ixgbe/ixgbe_ethdev.c +++ b/drivers/net/ixgbe/ixgbe_ethdev.c @@ -5815,8 +5815,6 @@ ixgbe_configure_msix(struct rte_eth_dev *dev) default: break; } - IXGBE_WRITE_REG(hw, IXGBE_EITR(IXGBE_MISC_VEC_ID), - IXGBE_MIN_INTER_INTERRUPT_INTERVAL_DEFAULT & 0xFFF); /* set up to autoclear timer, and the vectors */ mask = IXGBE_EIMS_ENABLE_MASK; -- 1.7.0.4