From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id E534FA054F; Mon, 15 Mar 2021 17:46:55 +0100 (CET) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id A7E7024272C; Mon, 15 Mar 2021 17:46:41 +0100 (CET) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by mails.dpdk.org (Postfix) with ESMTP id D1816242727 for ; Mon, 15 Mar 2021 17:46:39 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1615826799; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GuVumaI8MCfSB+JJYW3CMd7HZY27qDTQqwb5Q23UR1U=; b=IigOmufqRIzxPzBxIx+rP7oAwg5ZO5ze5wBoTFt1lFUYItnYoh/IgAZrgCE3VXe/nNzGKK f7j/2A7nsqSp8NSPWLZmfMzbPzJpisvVkDU7ax1XNV6APhr/rEm6bcv0va5apL5hNnXKQg nVYepDZa1Muclb7TVnpBkul2TLnknB0= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-601-rhJzUrj5P_6yf2BynkWZwg-1; Mon, 15 Mar 2021 12:46:37 -0400 X-MC-Unique: rhJzUrj5P_6yf2BynkWZwg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 01C4210866A3; Mon, 15 Mar 2021 16:46:36 +0000 (UTC) Received: from max-t490s.redhat.com (unknown [10.36.110.10]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3D1DA614ED; Mon, 15 Mar 2021 16:46:34 +0000 (UTC) From: Maxime Coquelin To: dev@dpdk.org, chenbo.xia@intel.com, amorenoz@redhat.com, david.marchand@redhat.com, olivier.matz@6wind.com, bnemeth@redhat.com Cc: Maxime Coquelin Date: Mon, 15 Mar 2021 17:46:18 +0100 Message-Id: <20210315164619.372575-4-maxime.coquelin@redhat.com> In-Reply-To: <20210315164619.372575-1-maxime.coquelin@redhat.com> References: <20210315164619.372575-1-maxime.coquelin@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=maxime.coquelin@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Subject: [dpdk-dev] [PATCH v3 3/4] net/virtio: allocate fake mbuf in Rx queue X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 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" While it is worth clarifying whether the fake mbuf in virtnet_rx struct is really necessary, it is sure that it heavily impacts cache usage by being part of the struct. Indeed, it uses two cachelines, and requires alignment on a cacheline. Before this series, it means it took 120 bytes in virtnet_rx struct: struct virtnet_rx { struct virtqueue * vq; /* 0 8 */ /* XXX 56 bytes hole, try to pack */ /* --- cacheline 1 boundary (64 bytes) --- */ struct rte_mbuf fake_mbuf __attribute__((__aligned__(64))); /* 64 128 */ /* --- cacheline 3 boundary (192 bytes) --- */ This patch allocates it using malloc in order to optimize virtnet_rx cache usage and so virtqueue cache usage. Signed-off-by: Maxime Coquelin --- drivers/net/virtio/virtio_ethdev.c | 13 +++++++++++++ drivers/net/virtio/virtio_rxtx.c | 9 +++------ drivers/net/virtio/virtio_rxtx.h | 2 +- 3 files changed, 17 insertions(+), 7 deletions(-) diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c index d5643733f7..fda6c141dd 100644 --- a/drivers/net/virtio/virtio_ethdev.c +++ b/drivers/net/virtio/virtio_ethdev.c @@ -435,6 +435,7 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t queue_idx) int queue_type = virtio_get_queue_type(hw, queue_idx); int ret; int numa_node = dev->device->numa_node; + struct rte_mbuf *fake_mbuf = NULL; PMD_INIT_LOG(INFO, "setting up queue: %u on NUMA node %d", queue_idx, numa_node); @@ -550,10 +551,19 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t queue_idx) goto free_hdr_mz; } + fake_mbuf = rte_zmalloc_socket("sw_ring", sizeof(*fake_mbuf), + RTE_CACHE_LINE_SIZE, numa_node); + if (!fake_mbuf) { + PMD_INIT_LOG(ERR, "can not allocate fake mbuf"); + ret = -ENOMEM; + goto free_sw_ring; + } + vq->sw_ring = sw_ring; rxvq = &vq->rxq; rxvq->port_id = dev->data->port_id; rxvq->mz = mz; + rxvq->fake_mbuf = fake_mbuf; } else if (queue_type == VTNET_TQ) { txvq = &vq->txq; txvq->port_id = dev->data->port_id; @@ -612,6 +622,8 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t queue_idx) clean_vq: hw->cvq = NULL; + rte_free(fake_mbuf); +free_sw_ring: rte_free(sw_ring); free_hdr_mz: rte_memzone_free(hdr_mz); @@ -641,6 +653,7 @@ virtio_free_queues(struct virtio_hw *hw) queue_type = virtio_get_queue_type(hw, i); if (queue_type == VTNET_RQ) { + free(vq->rxq.fake_mbuf); rte_free(vq->sw_ring); rte_memzone_free(vq->rxq.mz); } else if (queue_type == VTNET_TQ) { diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c index 32af8d3d11..8df913b0ba 100644 --- a/drivers/net/virtio/virtio_rxtx.c +++ b/drivers/net/virtio/virtio_rxtx.c @@ -703,12 +703,9 @@ virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx) virtio_rxq_vec_setup(rxvq); } - memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf)); - for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST; - desc_idx++) { - vq->sw_ring[vq->vq_nentries + desc_idx] = - &rxvq->fake_mbuf; - } + memset(rxvq->fake_mbuf, 0, sizeof(*rxvq->fake_mbuf)); + for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST; desc_idx++) + vq->sw_ring[vq->vq_nentries + desc_idx] = rxvq->fake_mbuf; if (hw->use_vec_rx && !virtio_with_packed_queue(hw)) { while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) { diff --git a/drivers/net/virtio/virtio_rxtx.h b/drivers/net/virtio/virtio_rxtx.h index 7f1036be6f..6ce5d67d15 100644 --- a/drivers/net/virtio/virtio_rxtx.h +++ b/drivers/net/virtio/virtio_rxtx.h @@ -19,7 +19,7 @@ struct virtnet_stats { struct virtnet_rx { /* dummy mbuf, for wraparound when processing RX ring. */ - struct rte_mbuf fake_mbuf; + struct rte_mbuf *fake_mbuf; uint64_t mbuf_initializer; /**< value to init mbufs. */ struct rte_mempool *mpool; /**< mempool for mbuf allocation */ -- 2.29.2