From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx01.omp.ru (mx01.omp.ru [90.154.21.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 118951E484; Sat, 10 Feb 2024 19:00:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.154.21.10 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707591616; cv=none; b=IZN5lx7dl71uSobjYF3zhzMaiIaFEDcAmDOwnAcNX90E5rktc9U38z7CCWdFHgbmDp9UlF9dpgmO+WslEXofokWRmHQ0QcCGmEL562ldZf0CyE6vePLq4OjOkgZSn5+58jrIUtrj3Fg9cHsYujksVMjCvVBd3cwzZcpoa84hi30= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707591616; c=relaxed/simple; bh=Fo6J3Gy8ycyo9hzI3RO5OPWx7YlKcajwMmao4j8bYyg=; h=Subject:To:CC:References:From:Message-ID:Date:MIME-Version: In-Reply-To:Content-Type; b=TP4bRr/OZmeT20pJfDnOwXR6w+QCuh8PCpVb8HYTaWue/uPvwsHOm13S0KvUm+1HqFjKjKoreeOOxU2Lm6gdrILcD8PYA7WFfOvKDxY5xRw39ntanlh8VVzHn5663+x83UWygBz4EjkBacH6lxDhqZXbDsnV7PAVzUfU3C9QhRQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=omp.ru; spf=pass smtp.mailfrom=omp.ru; arc=none smtp.client-ip=90.154.21.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=omp.ru Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=omp.ru Received: from [192.168.1.105] (31.173.86.126) by msexch01.omp.ru (10.188.4.12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.1258.12; Sat, 10 Feb 2024 22:00:03 +0300 Subject: Re: [RFC PATCH net-next v2 7/7] net: ravb: Use NAPI threaded mode on 1-core CPUs with GbEth IP To: Paul Barker , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni CC: Yoshihiro Shimoda , Wolfram Sang , , , References: <20240206091909.3191-1-paul.barker.ct@bp.renesas.com> <20240206091909.3191-8-paul.barker.ct@bp.renesas.com> From: Sergey Shtylyov Organization: Open Mobile Platform Message-ID: <9ec29425-d66f-e808-52e3-7e4ce5cd79a5@omp.ru> Date: Sat, 10 Feb 2024 22:00:03 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <20240206091909.3191-8-paul.barker.ct@bp.renesas.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: msexch02.omp.ru (10.188.4.13) To msexch01.omp.ru (10.188.4.12) X-KSE-ServerInfo: msexch01.omp.ru, 9 X-KSE-AntiSpam-Interceptor-Info: scan successful X-KSE-AntiSpam-Version: 6.1.0, Database issued on: 02/10/2024 18:45:25 X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED X-KSE-AntiSpam-Method: none X-KSE-AntiSpam-Rate: 59 X-KSE-AntiSpam-Info: Lua profiles 183344 [Feb 10 2024] X-KSE-AntiSpam-Info: Version: 6.1.0.3 X-KSE-AntiSpam-Info: Envelope from: s.shtylyov@omp.ru X-KSE-AntiSpam-Info: LuaCore: 7 0.3.7 6d6bf5bd8eea7373134f756a2fd73e9456bb7d1a X-KSE-AntiSpam-Info: {rep_avail} X-KSE-AntiSpam-Info: {Tracking_from_domain_doesnt_match_to} X-KSE-AntiSpam-Info: {relay has no DNS name} X-KSE-AntiSpam-Info: {SMTP from is not routable} X-KSE-AntiSpam-Info: {Found in DNSBL: 31.173.86.126 in (user) b.barracudacentral.org} X-KSE-AntiSpam-Info: {Found in DNSBL: 31.173.86.126 in (user) dbl.spamhaus.org} X-KSE-AntiSpam-Info: 127.0.0.199:7.1.2;omp.ru:7.1.1;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1 X-KSE-AntiSpam-Info: ApMailHostAddress: 31.173.86.126 X-KSE-AntiSpam-Info: {DNS response errors} X-KSE-AntiSpam-Info: Rate: 59 X-KSE-AntiSpam-Info: Status: not_detected X-KSE-AntiSpam-Info: Method: none X-KSE-AntiSpam-Info: Auth:dmarc=temperror header.from=omp.ru;spf=temperror smtp.mailfrom=omp.ru;dkim=none X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Heuristic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 02/10/2024 18:49:00 X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: Clean, bases: 2/10/2024 2:13:00 PM X-KSE-Attachment-Filter-Triggered-Rules: Clean X-KSE-Attachment-Filter-Triggered-Filters: Clean X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit On 2/6/24 12:19 PM, Paul Barker wrote: > NAPI Threaded mode (along with the previously enabled SW IRQ Coalescing) > is required to improve network stack performance for single core SoCs > using the GbEth IP (currently the RZ/G2L SoC family and the RZ/G3S SoC). > > For the RZ/G2UL, network throughput is greatly increased by this change > (results obtained with iperf3) for all test cases except UDP TX: > * TCP TX: 30% more throughput > * TCP RX: 9.8% more throughput > * UDP TX: 9.7% less throughput > * UDP RX: 89% more throughput > > For the RZ/G3S we see improvements in network throughput similar to the > RZ/G2UL. > > The improvement of UDP RX bandwidth for the single core SoCs (RZ/G2UL & > RZ/G3S) is particularly critical. NAPI Threaded mode can be disabled at > runtime via sysfs for applications where UDP TX performance is a > priority. > > Signed-off-by: Paul Barker Reviewed-by: Sergey Shtylyov [...] MBR, Sergey