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b=OuSwo7wO1t4Ugsy12y+8ok7okVt3dl+VkNPbIgHSe1CDzvQPMGmzjtSlcCokgeBd4 UytOcbbBiXEKwDCxwdZs70AnYUGIrdclAfxo0KowTMHDZcnX3CcpaVlkeZ4VC4nP5M FS5PrFm3OZhkON3wQuTCDMcU/LrxxsfsSybhOVHuo/Z2Vf15LmmR5HvVbty2PFaU2w HTudFM7NmBo9vNLk6F/8+DYQD1opOeHIaVF/VIovQKlRLPL4jiiuF+YrRrXJQOL4f5 GknrEsJctdAxzkwc0NX+hl5Eq2M0nTvfHk57N40gNR/5na2HAr3+5C6DrlDC5nnAG8 WStcta6UMdzXQ== Subject: Re: [dpdk-stable] [PATCH] net/mlx5: fix external buffer pool registration for Rx queue X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" From: Viacheslav Ovsiienko > On Rx queue creation the mlx5 PMD registers the data buffers of the speci= fied > pools for DMA operations. It scans the mem_list of the pools and creates = the > MRs (DMA related NIC objects) for the chunks found. > If the pool is created with rte_pktmbuf_pool_create_extbuf() and refers t= o the > external attached buffers (whose are in the area of application responsib= ility > and it should explicitly register the data buffer memory for DMA with > rte_dev_dma_map() call) the chunks contain the mbuf structures only, w/o = any > built-in data buffers. > Hence, DMA with mlx5 NIC never happens to this area and there is no need = to > create MRs for these ones. >=20 > The extra not needed MRs were created for the pools with external buffers > causing MR cache load and performance was slightly affected. > The patch checks the mbuf pool type and skips MR creation for the pools w= ith > external buffers. >=20 > Fixes: bdb8e5b1ea7b ("net/mlx5: allow allocated mbuf with external buffer= ") > Cc: stable@dpdk.org >=20 > Signed-off-by: Viacheslav Ovsiienko Acked-by: Matan Azrad Good catch! > --- > drivers/net/mlx5/mlx5_mr.c | 11 +++++++++++ > 1 file changed, 11 insertions(+)