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From: "Xia, Chenbo" <chenbo.xia@intel.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"amorenoz@redhat.com" <amorenoz@redhat.com>,
	"david.marchand@redhat.com" <david.marchand@redhat.com>,
	"olivier.matz@6wind.com" <olivier.matz@6wind.com>,
	"bnemeth@redhat.com" <bnemeth@redhat.com>
Subject: Re: [dpdk-dev] [PATCH v4 3/4] net/virtio: allocate fake mbuf in Rx queue
Date: Wed, 17 Mar 2021 09:10:29 +0000	[thread overview]
Message-ID: <MN2PR11MB4063905AD1B75A0108E3293A9C6A9@MN2PR11MB4063.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20210316093825.478723-4-maxime.coquelin@redhat.com>

Hi Maxime,

> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin@redhat.com>
> Sent: Tuesday, March 16, 2021 5:38 PM
> To: dev@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>; amorenoz@redhat.com;
> david.marchand@redhat.com; olivier.matz@6wind.com; bnemeth@redhat.com
> Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
> Subject: [PATCH v4 3/4] net/virtio: allocate fake mbuf in Rx queue
> 
> 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 <maxime.coquelin@redhat.com>
> Reviewed-by: David Marchand <david.marchand@redhat.com>
> ---
>  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..be9faa3b6c 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) {
> +			rte_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++)

I just notice that the macro 'RTE_PMD_VIRTIO_RX_MAX_BURST' and 'RTE_VIRTIO_VPMD_RX_BURST'
should always have the same value, so maybe better to make them into one macro later?

For this patch:

Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>

> +		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


  reply	other threads:[~2021-03-18  8:51 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-16  9:38 [dpdk-dev] [PATCH v4 0/4] net/virtio: make virtqueue struct cache-friendly Maxime Coquelin
2021-03-16  9:38 ` [dpdk-dev] [PATCH v4 1/4] net/virtio: remove reference to virtqueue in vrings Maxime Coquelin
2021-03-16  9:38 ` [dpdk-dev] [PATCH v4 2/4] net/virtio: improve queue init error path Maxime Coquelin
2021-03-17  9:01   ` Xia, Chenbo
2021-03-16  9:38 ` [dpdk-dev] [PATCH v4 3/4] net/virtio: allocate fake mbuf in Rx queue Maxime Coquelin
2021-03-17  9:10   ` Xia, Chenbo [this message]
2021-03-16  9:38 ` [dpdk-dev] [PATCH v4 4/4] net/virtio: pack virtqueue struct Maxime Coquelin
2021-03-29 10:55 ` [dpdk-dev] [PATCH v4 0/4] net/virtio: make virtqueue struct cache-friendly Balazs Nemeth
2021-03-31  5:44 ` Xia, Chenbo

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