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[ { "id": 116538, "web_url": "https://patches.dpdk.org/comment/116538/", "msgid": "<AM0PR05MB670721BA5BCA10AA50B3C2E0C2760@AM0PR05MB6707.eurprd05.prod.outlook.com>", "list_archive_url": "https://inbox.dpdk.org/dev/AM0PR05MB670721BA5BCA10AA50B3C2E0C2760@AM0PR05MB6707.eurprd05.prod.outlook.com", "date": "2020-07-23T08:57:27", "subject": "Re: [dpdk-dev] [PATCH] net/mlx5: fix vectorized mini-CQE prefetching", "submitter": { "id": 513, "url": "https://patches.dpdk.org/api/people/513/?format=api", "name": "Raslan Darawsheh", "email": "rasland@mellanox.com" }, "content": "Hi,\n\n> -----Original Message-----\n> From: Alexander Kozyrev <akozyrev@mellanox.com>\n> Sent: Wednesday, July 22, 2020 11:33 PM\n> To: dev@dpdk.org\n> Cc: stable@dpdk.org; Raslan Darawsheh <rasland@mellanox.com>; Slava\n> Ovsiienko <viacheslavo@mellanox.com>\n> Subject: [PATCH] net/mlx5: fix vectorized mini-CQE prefetching\n> \n> There was an optimization work to prefetch all the CQEs before\n> their invalidation. It allowed us to speed up the mini-CQE\n> decompression process by preheating the cache in the vectorized\n> Rx routine.\n> \n> Prefetching of the next mini-CQE, on the other hand, showed\n> no difference in the performance on x86 platform. So, that was\n> removed. Unfortunately this caused the performance drop on ARM.\n> \n> Prefetch the mini-CQE as well as well as the all the soon to be\n> invalidated CQEs to get both CQE and mini-CQE on the hot path.\n> \n> Fixes: 28a4b9632 (\"net/mlx5: prefetch CQEs for a faster decompression\")\n> Cc: stable@dpdk.org\n> \n> Signed-off-by: Alexander Kozyrev <akozyrev@mellanox.com>\n> Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>\n> ---\n> drivers/net/mlx5/mlx5_rxtx_vec_altivec.h | 3 ++-\n> drivers/net/mlx5/mlx5_rxtx_vec_neon.h | 3 +++\n> drivers/net/mlx5/mlx5_rxtx_vec_sse.h | 3 ++-\n> 3 files changed, 7 insertions(+), 2 deletions(-)\n> \n> diff --git a/drivers/net/mlx5/mlx5_rxtx_vec_altivec.h\n> b/drivers/net/mlx5/mlx5_rxtx_vec_altivec.h\n> index f5414eebad..cb4ce1a099 100644\n> --- a/drivers/net/mlx5/mlx5_rxtx_vec_altivec.h\n> +++ b/drivers/net/mlx5/mlx5_rxtx_vec_altivec.h\n> @@ -158,7 +158,6 @@ rxq_cq_decompress_v(struct mlx5_rxq_data *rxq,\n> volatile struct mlx5_cqe *cq,\n> \t\tfor (i = 0; i < MLX5_VPMD_DESCS_PER_LOOP; ++i)\n> \t\t\tif (likely(pos + i < mcqe_n))\n> \t\t\t\trte_prefetch0((void *)(cq + pos + i));\n> -\n> \t\t/* A.1 load mCQEs into a 128bit register. */\n> \t\tmcqe1 = (vector unsigned char)vec_vsx_ld(0,\n> \t\t\t(signed int const *)&mcq[pos % 8]);\n> @@ -287,6 +286,8 @@ rxq_cq_decompress_v(struct mlx5_rxq_data *rxq,\n> volatile struct mlx5_cqe *cq,\n> \t\tpos += MLX5_VPMD_DESCS_PER_LOOP;\n> \t\t/* Move to next CQE and invalidate consumed CQEs. */\n> \t\tif (!(pos & 0x7) && pos < mcqe_n) {\n> +\t\t\tif (pos + 8 < mcqe_n)\n> +\t\t\t\trte_prefetch0((void *)(cq + pos + 8));\n> \t\t\tmcq = (void *)&(cq + pos)->pkt_info;\n> \t\t\tfor (i = 0; i < 8; ++i)\n> \t\t\t\tcq[inv++].op_own =\n> MLX5_CQE_INVALIDATE;\n> diff --git a/drivers/net/mlx5/mlx5_rxtx_vec_neon.h\n> b/drivers/net/mlx5/mlx5_rxtx_vec_neon.h\n> index 555c342626..6c3149523e 100644\n> --- a/drivers/net/mlx5/mlx5_rxtx_vec_neon.h\n> +++ b/drivers/net/mlx5/mlx5_rxtx_vec_neon.h\n> @@ -145,6 +145,7 @@ rxq_cq_decompress_v(struct mlx5_rxq_data *rxq,\n> volatile struct mlx5_cqe *cq,\n> \t\t\t\t -1UL << ((mcqe_n - pos) *\n> \t\t\t\t\t sizeof(uint16_t) * 8) : 0);\n> #endif\n> +\n> \t\tfor (i = 0; i < MLX5_VPMD_DESCS_PER_LOOP; ++i)\n> \t\t\tif (likely(pos + i < mcqe_n))\n> \t\t\t\trte_prefetch0((void *)(cq + pos + i));\n> @@ -227,6 +228,8 @@ rxq_cq_decompress_v(struct mlx5_rxq_data *rxq,\n> volatile struct mlx5_cqe *cq,\n> \t\tpos += MLX5_VPMD_DESCS_PER_LOOP;\n> \t\t/* Move to next CQE and invalidate consumed CQEs. */\n> \t\tif (!(pos & 0x7) && pos < mcqe_n) {\n> +\t\t\tif (pos + 8 < mcqe_n)\n> +\t\t\t\trte_prefetch0((void *)(cq + pos + 8));\n> \t\t\tmcq = (void *)&(cq + pos)->pkt_info;\n> \t\t\tfor (i = 0; i < 8; ++i)\n> \t\t\t\tcq[inv++].op_own =\n> MLX5_CQE_INVALIDATE;\n> diff --git a/drivers/net/mlx5/mlx5_rxtx_vec_sse.h\n> b/drivers/net/mlx5/mlx5_rxtx_vec_sse.h\n> index 34e3397115..554924d7fc 100644\n> --- a/drivers/net/mlx5/mlx5_rxtx_vec_sse.h\n> +++ b/drivers/net/mlx5/mlx5_rxtx_vec_sse.h\n> @@ -135,7 +135,6 @@ rxq_cq_decompress_v(struct mlx5_rxq_data *rxq,\n> volatile struct mlx5_cqe *cq,\n> \t\tfor (i = 0; i < MLX5_VPMD_DESCS_PER_LOOP; ++i)\n> \t\t\tif (likely(pos + i < mcqe_n))\n> \t\t\t\trte_prefetch0((void *)(cq + pos + i));\n> -\n> \t\t/* A.1 load mCQEs into a 128bit register. */\n> \t\tmcqe1 = _mm_loadu_si128((__m128i *)&mcq[pos % 8]);\n> \t\tmcqe2 = _mm_loadu_si128((__m128i *)&mcq[pos % 8 + 2]);\n> @@ -214,6 +213,8 @@ rxq_cq_decompress_v(struct mlx5_rxq_data *rxq,\n> volatile struct mlx5_cqe *cq,\n> \t\tpos += MLX5_VPMD_DESCS_PER_LOOP;\n> \t\t/* Move to next CQE and invalidate consumed CQEs. */\n> \t\tif (!(pos & 0x7) && pos < mcqe_n) {\n> +\t\t\tif (pos + 8 < mcqe_n)\n> +\t\t\t\trte_prefetch0((void *)(cq + pos + 8));\n> \t\t\tmcq = (void *)(cq + pos);\n> \t\t\tfor (i = 0; i < 8; ++i)\n> \t\t\t\tcq[inv++].op_own =\n> MLX5_CQE_INVALIDATE;\n> --\n> 2.24.1\n\nPatch applied to next-net-mlx,\n\nKindest regards,\nRaslan Darawsheh", "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from dpdk.org (dpdk.org [92.243.14.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id 45EB5A053D;\n\tThu, 23 Jul 2020 10:57:43 +0200 (CEST)", "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id A6B4D1BFFA;\n\tThu, 23 Jul 2020 10:57:33 +0200 (CEST)", "from EUR05-DB8-obe.outbound.protection.outlook.com\n (mail-db8eur05on2056.outbound.protection.outlook.com [40.107.20.56])\n by dpdk.org (Postfix) with ESMTP id D39411BF94;\n Thu, 23 Jul 2020 10:57:29 +0200 (CEST)", "from AM0PR05MB6707.eurprd05.prod.outlook.com (2603:10a6:20b:15b::17)\n by AM0PR05MB4402.eurprd05.prod.outlook.com (2603:10a6:208:5c::31)\n with Microsoft SMTP Server (version=TLS1_2,\n cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3216.24; 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mx.microsoft.com 1; spf=pass\n smtp.mailfrom=mellanox.com; dmarc=pass action=none header.from=mellanox.com;\n dkim=pass header.d=mellanox.com; arc=none", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=Mellanox.com;\n s=selector1;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=4j7eVV0EmTzMG2wJaLa4BzvT64zAsb1dtlxlw015VUk=;\n b=c0qnDmEKuLAFHeeDSNaxrJOrUJaD6X5xtEnghpqAdFSdl8FcdBv5EsYilFR7Cc7h7tXtJuUINhwYcK3nat5wdbZ4ZThvcgEnHEO8yyv9d6uE8kyzEIg7FMOJL5xzcjyz+ONj6CpMHt46SzoVDVunK1WZY3Ixjtavcl6CjoFa0YI=", "From": "Raslan Darawsheh <rasland@mellanox.com>", "To": "Alexander Kozyrev <akozyrev@mellanox.com>, \"dev@dpdk.org\" <dev@dpdk.org>", "CC": "\"stable@dpdk.org\" <stable@dpdk.org>, Slava Ovsiienko\n <viacheslavo@mellanox.com>", "Thread-Topic": "[PATCH] net/mlx5: fix vectorized mini-CQE prefetching", "Thread-Index": "AQHWYGdAQeUPYAJFKEyE463PJEpE0akU3V+w", "Date": "Thu, 23 Jul 2020 08:57:27 +0000", "Message-ID": "\n <AM0PR05MB670721BA5BCA10AA50B3C2E0C2760@AM0PR05MB6707.eurprd05.prod.outlook.com>", "References": "<20200722203238.14250-1-akozyrev@mellanox.com>", "In-Reply-To": "<20200722203238.14250-1-akozyrev@mellanox.com>", "Accept-Language": "en-US", "Content-Language": "en-US", "X-MS-Has-Attach": "", "X-MS-TNEF-Correlator": "", "authentication-results": "mellanox.com; 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