From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by dpdk.org (Postfix) with ESMTP id B844F37AC for ; Tue, 3 May 2016 02:42:55 +0200 (CEST) Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga102.fm.intel.com with ESMTP; 02 May 2016 17:42:54 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,570,1455004800"; d="scan'208";a="967323208" Received: from yliu-dev.sh.intel.com ([10.239.67.162]) by orsmga002.jf.intel.com with ESMTP; 02 May 2016 17:42:53 -0700 From: Yuanhan Liu To: dev@dpdk.org Cc: huawei.xie@intel.com, Yuanhan Liu Date: Mon, 2 May 2016 17:46:15 -0700 Message-Id: <1462236378-7604-1-git-send-email-yuanhan.liu@linux.intel.com> X-Mailer: git-send-email 1.9.0 Subject: [dpdk-dev] [PATCH 0/3] [RFC] vhost: micro vhost optimization 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: Tue, 03 May 2016 00:42:56 -0000 Here is a small patch set does the micro optimization, which brings about 10% performance boost in my 64B packet testing, with the following topo: pkt generator <----> NIC <-----> Virtio NIC Patch 1 pre updates the used ring and update them in batch. It should be feasible from my understanding: there will be no issue, guest driver will not start processing them as far as we haven't updated the "used->idx" yet. I could miss something though. Patch 2 saves one check for small packets (that can be hold in one desc buf and mbuf). Patch 3 moves several frequently used fields into one cache line, for better cache sharing. Note that this patch set is based on my latest vhost ABI refactoring patchset. --- Yuanhan Liu (3): vhost: pre update used ring for Tx and Rx vhost: optimize dequeue for small packets vhost: arrange virtio_net fields for better cache sharing lib/librte_vhost/vhost-net.h | 8 +-- lib/librte_vhost/vhost_rxtx.c | 110 ++++++++++++++++++++++++------------------ 2 files changed, 68 insertions(+), 50 deletions(-) -- 1.9.0