From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f48.google.com (mail-wr1-f48.google.com [209.85.221.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F134720468E; Wed, 6 Aug 2025 07:25:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.48 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754465103; cv=none; b=BLSLHB2Yu0D3Zsvp5opfLsQNoMSCEmk7q0SE0xpm2ydiscIkOLasAQ4gI+InuIGazkuUaDAC8Ho4XfidH81fYAmkjFzewAmbXL2zfarypmX3bUiGMncV9u2SW68DrJ64h1sJpqUTA4IEgKkkARS1igHZoZQK8UJqms+6TBGDWwg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754465103; c=relaxed/simple; bh=vAyQjzdKloag6yEo57pIpIcddwUakldw+0v9sT0viuU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Pjvs9RWi9jLMDNy7UG3nMzCvJGbeUTg4l8tKqzb8hGVHgXYHwBanSBcHr2tOvM6NMcnqBLh5Qzn06Qt1/ph15h1XArRfyE90k1Ko4SqjpRRp1ZedFcTEKtd4irBiazlBQvbG1Wgwgu2wn7ZGVX1V6IcGVhZKfw8j2DBEzSBKfkw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=fejes.dev; spf=pass smtp.mailfrom=gmail.com; arc=none smtp.client-ip=209.85.221.48 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=fejes.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-wr1-f48.google.com with SMTP id ffacd0b85a97d-3b783d851e6so5450879f8f.0; Wed, 06 Aug 2025 00:25:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754465100; x=1755069900; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:cc:to:from:subject:message-id:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=vAyQjzdKloag6yEo57pIpIcddwUakldw+0v9sT0viuU=; b=dEGd+/PpTvjtqSXKqzbgb99snw8/iAosb/OMig+6WR9fkYh8kI5q2OkIq0v2PilGM1 dsULqbtZu80M4pNfYStcoFk8py45rqPpS1Xs80UTKBNoKX7LP2PKhkA4csQbFWduOOYP ASicDvK6METF4RIlPU+XdzMkVufy34qIS2ss/xrVKo8u9CVn1+VXR6D66LJW2+XmPzDV 1hbIJp7DkSd1BFOYNgAaOPIzedEcShHrk9iB2EhOm3YOR++hRCnJem2zcE2rSTnESEKf h/prQJnzOrvoCX3j96Trut9hAxLbdBNYRCJ3IG/0uYF0ldh7DDO84CpP/20MZ8dSW6dX 4ueQ== X-Forwarded-Encrypted: i=1; AJvYcCX3XLDQWCAumDvTjGVdOqMzwZNpp4yQ1DPAYta7jMiJUMZXwugYgnlVLpGXQdz8nqCJ0izcmY4D@vger.kernel.org, AJvYcCXLMMcfJLxJAQgd0lljpWC8wGJpfggfmBWmFRdvaunO39ZUo98OudREqxNvhcFzlUOE64JWyY3wUrI1sC0=@vger.kernel.org X-Gm-Message-State: AOJu0YzayNF6pH/kMnnoRLuL9kYJgId6lzhdABZCCyoL7M5hhOJLnWlP o1Pq4Exd5fnLx4ZjpAGHZp1Rzlw7XXOI2LB+kDH0XB4Rqv9RWM6GQb4A X-Gm-Gg: ASbGncvr5SRdZTQ1umcpKgmyyXY6gBYeOd26Rm2gfXFtXQdAfpS9/rhgmCDl+EB5nfZ B6OUVa5K8JbnQppZPuZM6R5i9pvPiCIwdJlOt8eGefnKJDwIRB7byQ0n1Ge5V6iJLGOekScY1tF KPHvhTcgrQcuXOqq/FMGJyeSsGArzvqg5tGMCgA2LsRhBJkXaLyCBKB0a2zW1tamo7elvSOW7Ka BO4hIpjcVDd6D52Xxbgb9T/kwJ+VPZT35c0Qj33+RQRi3VdagKoXqPSygsJXt4C8fQfFJkG0VcS oXdUWFndBXRH8v9ARnW7fxrRDNYuwtvijMUkIadZ6XCu92zsfwoEGCJSDGbfLi7CJfsQxt9aCZ/ XqIAQ+994JQw+u5Z/RfFSpTJ3n0nbfZ6YspPSI52DyZNI X-Google-Smtp-Source: AGHT+IGR8ny0IPp42f3jE50MGwGkyEI6LYFeLbcDfeA5cPuxu0SLfdY4qVa4wH4utZ38yPEyQhDFlw== X-Received: by 2002:a05:6000:2305:b0:3b7:7936:e7fb with SMTP id ffacd0b85a97d-3b8f49162f6mr915780f8f.30.1754465099959; Wed, 06 Aug 2025 00:24:59 -0700 (PDT) Received: from [10.148.80.226] ([195.228.69.10]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b79c3b9160sm21998702f8f.21.2025.08.06.00.24.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 Aug 2025 00:24:58 -0700 (PDT) Message-ID: <2fb8917d59b22dd78fe1ff216157eea7128e5990.camel@fejes.dev> Subject: Re: [PATCH] net: af_packet: add af_packet hrtimer mode From: Ferenc Fejes To: Xin Zhao , willemdebruijn.kernel@gmail.com Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 06 Aug 2025 09:24:57 +0200 In-Reply-To: <20250806055210.1530081-1-jackzxcui1989@163.com> References: <20250806055210.1530081-1-jackzxcui1989@163.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.1-1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2025-08-06 at 13:52 +0800, Xin Zhao wrote: > In a system with high real-time requirements, the timeout mechanism of > ordinary timers with jiffies granularity is insufficient to meet the > demands for real-time performance. Meanwhile, the optimization of CPU > usage with af_packet is quite significant. Add hrtimer mode to help > compensate for the shortcomings in real-time performance. Do you have performance numbers? It would be nice to see the test environme= nt, measurements carried out and some latency/jitter numbers. Thanks, Ferenc