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 97448A0C41 for ; Mon, 15 Nov 2021 19:24:23 +0100 (CET) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 4850141184; Mon, 15 Nov 2021 19:24:22 +0100 (CET) Received: from mail-pf1-f182.google.com (mail-pf1-f182.google.com [209.85.210.182]) by mails.dpdk.org (Postfix) with ESMTP id 993A14117E for ; Mon, 15 Nov 2021 19:24:20 +0100 (CET) Received: by mail-pf1-f182.google.com with SMTP id z6so15792265pfe.7 for ; Mon, 15 Nov 2021 10:24:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version; bh=rzeIIaLGVJGXFd3btntROubVMZ9bDiAWg36KdD1xdIw=; b=EkByg0g7KRJszBn57LLw8G4tTa2XZFhI2yZQeYFP6jblPMjno+BAAfl8w0JPri005N iWW/YS4SM0vRwDzF7BYbf+lNitaAGPWKqxRmQImWc6IAZNEo8VoBczg1Eop+dAW8WFx5 M6a7hl23pTRfvCsShsdtDK4/tJdKXSy0U5XD4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version; bh=rzeIIaLGVJGXFd3btntROubVMZ9bDiAWg36KdD1xdIw=; b=Vht3XLBTeZa6T9nSipQpdcLVUeI2dWZ4W2zzur37oKSOcumysaqbRHikY3qWUMR+9M 8foCUF1CwX3MJL1uSgnmwIzfMOFnzRo88ZWTv98FwUcvwSTnaxXhcptmIfkbLkY1STr/ A24mAIKMX48JNKcXVkVB6Gy5efJ0NYaUa9VLMqK93kxbW2srDfT6x5tIAlbo7DsKUEM4 YgXz//Ef/PuJPgDnBdatPld+urPRNCY6UQUozfqXBGUMtsY756xXQ6NyGTncKEgZq2tY ZqJBeNyc8SlUqZiMT2IA0axP0aV8FPojxhhlEmZPTX1lYwkFGdf/xjdFydz7pJzg5HHI uP0w== X-Gm-Message-State: AOAM530I6U4tFOOJ7I7mNsKcTFZ4mJnNZS/VPCJs1RYcMcFw3rfQZlqQ nrs8q33CIqrN8TGH4nc3hctWnQ== X-Google-Smtp-Source: ABdhPJyZUach79fosLsgwCHRDrtlE/inBzLgH1+SyUUhN2zniOrS8LryTHdKLID0ulzBYhp6QVDvYA== X-Received: by 2002:a05:6a00:2496:b0:49f:eba0:6575 with SMTP id c22-20020a056a00249600b0049feba06575mr34863006pfv.78.1637000659734; Mon, 15 Nov 2021 10:24:19 -0800 (PST) Received: from lrichardson-VirtualBox.dhcp.broadcom.net ([192.19.11.250]) by smtp.gmail.com with ESMTPSA id w7sm12419785pgo.56.2021.11.15.10.24.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Nov 2021 10:24:19 -0800 (PST) From: Lance Richardson To: Bruce Richardson , Konstantin Ananyev , Ajit Khaparde , Somnath Kotur Cc: dev@dpdk.org, stable@dpdk.org Subject: [PATCH 2/2] net/bnxt: remove software prefetches from AVX2 Rx path Date: Mon, 15 Nov 2021 13:24:10 -0500 Message-Id: <20211115182410.5545-3-lance.richardson@broadcom.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211115182410.5545-1-lance.richardson@broadcom.com> References: <20211115182410.5545-1-lance.richardson@broadcom.com> MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000d6229e05d0d7ea95" 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 --000000000000d6229e05d0d7ea95 Content-Transfer-Encoding: 8bit Testing has shown no performance benefit from software prefetching of receive completion descriptors in the AVX2 burst receive path, and slightly better performance without them on some CPU families, so this patch removes them. Fixes: c4e4c18963b0 ("net/bnxt: add AVX2 RX/Tx") Cc: stable@dpdk.org Signed-off-by: Lance Richardson --- drivers/net/bnxt/bnxt_rxtx_vec_avx2.c | 14 -------------- 1 file changed, 14 deletions(-) diff --git a/drivers/net/bnxt/bnxt_rxtx_vec_avx2.c b/drivers/net/bnxt/bnxt_rxtx_vec_avx2.c index 54e3af22ac..34bd22edf0 100644 --- a/drivers/net/bnxt/bnxt_rxtx_vec_avx2.c +++ b/drivers/net/bnxt/bnxt_rxtx_vec_avx2.c @@ -92,12 +92,6 @@ recv_burst_vec_avx2(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) cons = raw_cons & (cp_ring_size - 1); mbcons = (raw_cons / 2) & (rx_ring_size - 1); - /* Prefetch first four descriptor pairs. */ - rte_prefetch0(&cp_desc_ring[cons + 0]); - rte_prefetch0(&cp_desc_ring[cons + 4]); - rte_prefetch0(&cp_desc_ring[cons + 8]); - rte_prefetch0(&cp_desc_ring[cons + 12]); - /* Return immediately if there is not at least one completed packet. */ if (!bnxt_cpr_cmp_valid(&cp_desc_ring[cons], raw_cons, cp_ring_size)) return 0; @@ -136,14 +130,6 @@ recv_burst_vec_avx2(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) _mm256_storeu_si256((void *)&rx_pkts[i + 4], t0); #endif - /* Prefetch eight descriptor pairs for next iteration. */ - if (i + BNXT_RX_DESCS_PER_LOOP_VEC256 < nb_pkts) { - rte_prefetch0(&cp_desc_ring[cons + 16]); - rte_prefetch0(&cp_desc_ring[cons + 20]); - rte_prefetch0(&cp_desc_ring[cons + 24]); - rte_prefetch0(&cp_desc_ring[cons + 28]); - } - /* * Load eight receive completion descriptors into 256-bit * registers. 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