From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by smtp.lore.kernel.org (Postfix) with ESMTP id B89EBD46C01 for ; Thu, 29 Jan 2026 01:07:24 +0000 (UTC) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id E8CBC402BA; Thu, 29 Jan 2026 02:07:23 +0100 (CET) Received: from mail-wm1-f44.google.com (mail-wm1-f44.google.com [209.85.128.44]) by mails.dpdk.org (Postfix) with ESMTP id 4C41540297 for ; Thu, 29 Jan 2026 02:07:21 +0100 (CET) Received: by mail-wm1-f44.google.com with SMTP id 5b1f17b1804b1-47ee0291921so3164955e9.3 for ; Wed, 28 Jan 2026 17:07:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20230601.gappssmtp.com; s=20230601; t=1769648841; x=1770253641; darn=dpdk.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=JXMbfdo5deb7LQzNnPSMKjNbKlXxyssiuW3NfNvz4Sg=; b=iGvnfVG7Q06nyRkZR2RAgD2749g1VrD29KUc8DTVkXeIaIA867fseaXtMoVMPP6yFC kV6zL2m+I6agzQoxLaiLpXRYLrG5SDvvMItW8SYUSOvtYiaNsPeU2NpFYUPgCGVS0yi/ aQRiv7Wi+FufjOpXlP/o/F7rCFVUAUCiIzT9ymCqqBf3duvFSXVGcLkx26hprYT3MUpX /ZNYWqsZlg8kRx4JLV+sZric1dCVjSUsnHunhs6V/+Kb30adk8CrY+8F0cGkK8g0fp9Y 771kXTfULLlDf8YHRa/VG7PjHlwULSLtuxKIdy1e3VZivaTmmnERXpT/D/fZIgkmlkA/ YIfA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769648841; x=1770253641; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=JXMbfdo5deb7LQzNnPSMKjNbKlXxyssiuW3NfNvz4Sg=; b=ZnSYwuigwXpmc+GZIu7nlc7vEm73gufykLrhtDfYd+OKBemZ/SiOZZuqdc/NRVzkh5 FU6dvqBxEZPwVofOezhl4oM/LY8izGFoD3oPOPW3B0wjaKB7DV4aFXSkgEhV21vcnWGU B9ZuS5wQOFhYfzO6i8wVEUNYyZqSIbrduMl1uoCeSVdqesee4xs9iSvMxUQvQ3s9v+0h D+Am0R8LOn53M0o6aWOimPQUQim0uz5UMjSycFBl70QGho5FgSDQsLU+R/J9N2qqQTQB FM2VChg9EMML5XCNSi4c9ocHHTRaa68ezAE+2RC61Glv3fpAAQOt5Ijz06J4mll98q1I 8thg== X-Gm-Message-State: AOJu0YygRN7cl1xzxYeCDVjKuEic3WHOYX8GV7eKTmdMbWR8FCdgwQOB qTZPgTVMvzWVTrd8S36e5KlR6DQUArxWcLGTOlbfzXppYfmwhkeDYhtiibTVWSUG5OQ= X-Gm-Gg: AZuq6aJDaKCk7WpRf4dcH6YGAleV42bQ/NjgNqk9Onpgv4iTfM9iY4MhabwxkO5nh5l hnZolFf0Lq/ltmWruXQZMEG36OmnsNYCkxZAD0u+1O3LZduYUrfqEgBOIFnJQVTXgkY2NydxjPt nC2FCDLq9KS+rrK167uL+EhkZ2FaHrawD8SrDFGqllX2pJVDpj8/k7lEmxzx2vCvjhXYiL1F0/d B5Ey3/X1FFyg887GdhtLZ7iUaXvZl70+5TFox/E9phW0zbaKdEp7VF0HSIkpPz/LuxJiQliZsgR uHcYMR97YsDEK+5vpHU0Ozsdx9LC/7WOkhAmchxAXWrby3H9SxCZGpe0v9YkXVej4mBxxnteJKV QajoLITWrPty4jl+jX+Y0P/EChaSIvBetVbDgrgpuLPEsM+dgX97mlDaF75XB6b04tUeB9WwfSj Kzb9lRBT2JHLWNvF/StRLOKhoRE8flHaSWOkJ/BP+aR2wU8S+GfFE6 X-Received: by 2002:a05:600c:5489:b0:47e:de23:dd6f with SMTP id 5b1f17b1804b1-48069c4a7fbmr85688505e9.12.1769648841039; Wed, 28 Jan 2026 17:07:21 -0800 (PST) Received: from phoenix.local (204-195-96-226.wavecable.com. [204.195.96.226]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48066c37433sm148335095e9.10.2026.01.28.17.07.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Jan 2026 17:07:20 -0800 (PST) Date: Wed, 28 Jan 2026 17:07:15 -0800 From: Stephen Hemminger To: scott.k.mitch1@gmail.com Cc: dev@dpdk.org Subject: Re: [PATCH v3 2/4] net/af_packet: RX/TX unlikely, bulk free, prefetch Message-ID: <20260128170715.3bced6c7@phoenix.local> In-Reply-To: <20260128191032.78916-3-scott.k.mitch1@gmail.com> References: <20260128093607.62908-1-scott.k.mitch1@gmail.com> <20260128191032.78916-1-scott.k.mitch1@gmail.com> <20260128191032.78916-3-scott.k.mitch1@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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 On Wed, 28 Jan 2026 11:10:30 -0800 scott.k.mitch1@gmail.com wrote: > From: Scott Mitchell > > - Add rte_prefetch0() to prefetch next frame/mbuf while processing > current packet, reducing cache miss latency > - Use rte_pktmbuf_free_bulk() in TX path instead of individual > rte_pktmbuf_free() calls for better batch efficiency > - Add unlikely() hints for error paths (oversized packets, VLAN > insertion failures, sendto errors) to optimize branch prediction > - Remove unnecessary early nb_pkts == 0 when loop handles this > and app may never call with 0 frames. > > Signed-off-by: Scott Mitchell Drop the prefetch stuff, it doesn't matter. Original Prefetch Quad/Dual TX 1.427 Mpps 1.426 Mpps 1.426 Mpps RX 0.529 Mpps 0.530 Mpps 0.533 Mpps loss 87.93% 87.98% 88.0%