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 6A759A2EFC for ; Thu, 19 Sep 2019 10:58:46 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 0A1681EB91; Thu, 19 Sep 2019 10:57:14 +0200 (CEST) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by dpdk.org (Postfix) with ESMTP id 3CA0D1E91F for ; Thu, 19 Sep 2019 10:56:47 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Sep 2019 01:56:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,523,1559545200"; d="scan'208";a="271146166" Received: from npg-dpdk-virtual-marvin-dev.sh.intel.com ([10.67.119.142]) by orsmga001.jf.intel.com with ESMTP; 19 Sep 2019 01:56:45 -0700 From: Marvin Liu To: maxime.coquelin@redhat.com, tiwei.bie@intel.com, zhihong.wang@intel.com Cc: dev@dpdk.org, Marvin Liu Date: Fri, 20 Sep 2019 00:36:42 +0800 Message-Id: <20190919163643.24130-16-yong.liu@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190919163643.24130-1-yong.liu@intel.com> References: <20190905161421.55981-2-yong.liu@intel.com> <20190919163643.24130-1-yong.liu@intel.com> Subject: [dpdk-dev] [PATCH v2 15/16] vhost: check whether disable software pre-fetch 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" Disable software pre-fetch actions on Skylake and Cascadelake platforms. Hardware can fetch needed data for vhost, additional software pre-fetch will have impact on performance. Signed-off-by: Marvin Liu diff --git a/lib/librte_vhost/Makefile b/lib/librte_vhost/Makefile index 30839a001..5f3b42e56 100644 --- a/lib/librte_vhost/Makefile +++ b/lib/librte_vhost/Makefile @@ -16,6 +16,12 @@ CFLAGS += -I vhost_user CFLAGS += -fno-strict-aliasing LDLIBS += -lpthread +AVX512_SUPPORT=$(shell $(CC) -march=native -dM -E - avail->ring[vq->last_avail_idx & (vq->size - 1)]); +#endif for (pkt_idx = 0; pkt_idx < count; pkt_idx++) { uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen; @@ -1093,7 +1097,9 @@ virtio_dev_rx_burst_packed(struct virtio_net *dev, struct vhost_virtqueue *vq, UNROLL_PRAGMA(PRAGMA_PARAM) for (i = 0; i < PACKED_DESCS_BURST; i++) { +#ifndef DISABLE_SWPREFETCH rte_prefetch0((void *)(uintptr_t)desc_addrs[i]); +#endif hdrs[i] = (struct virtio_net_hdr_mrg_rxbuf *)desc_addrs[i]; lens[i] = pkts[i]->pkt_len + dev->vhost_hlen; } @@ -1647,7 +1653,9 @@ virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq, */ rte_smp_rmb(); +#ifndef DISABLE_SWPREFETCH rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]); +#endif VHOST_LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__); @@ -1818,7 +1826,9 @@ virtio_dev_tx_burst_packed(struct virtio_net *dev, struct vhost_virtqueue *vq, UNROLL_PRAGMA(PRAGMA_PARAM) for (i = 0; i < PACKED_DESCS_BURST; i++) { +#ifndef DISABLE_SWPREFETCH rte_prefetch0((void *)(uintptr_t)desc_addrs[i]); +#endif rte_memcpy(rte_pktmbuf_mtod_offset(pkts[i], void *, 0), (void *)(uintptr_t)(desc_addrs[i] + buf_offset), pkts[i]->pkt_len); -- 2.17.1