From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C023B2E62A3; Thu, 22 May 2025 23:24:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747956255; cv=none; b=YZcpKCy/RQA6NQZXLgSgQNVgy1ogeBtQ1mK2PGCOQNt/844kI7M7Pik1jlQRdhaJbd5fGFHtx5PRFCuWZVALwHZC1SlM6YZumpwB0fYRu5zAfip1mz28mLnDoK+VUXDkEYMf6pX8yFTQvy9tW39MZ1PLa8JszTL3U7ZmlXOfZCk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747956255; c=relaxed/simple; bh=y7e9P3hEYVjb2rwfefX+/4+/9fyA9woYlogIdjnrYWY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=pjUraQ0M/xlMSMUaK3Cpg60L/IXPf/F5JrSP9mZ8aUEWwLWOCcNCTz31fex4RCaWiEErO8QgzruULUeAsG5/fEBtfFmeMImIMnyB0S2RmR9WnCw6nCUUaDAW8ItE/8Wz7LmKUoYEQtw3v67KJr7HXdWYbXbbL+HB17ypOVQQ/3o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=vRTxT7w5; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="vRTxT7w5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0CAF9C4CEEF; Thu, 22 May 2025 23:24:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1747956254; bh=y7e9P3hEYVjb2rwfefX+/4+/9fyA9woYlogIdjnrYWY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vRTxT7w5ShuM+U2ecxDsu8/xXhl5mZOvdjWYRV2H8si8LbPzsJoUftWYXxdNS27wp +Ic3RyhnRXODUlHfylAMidD569hQ+GGYGjIyeeEtMlxpst51OgSBDvIEtgEeF2V82J ontzSuYHEeAKvBaJqfA8A2I3hP2MBVp9qeVIbKPC26a/hkqL9X4zfYrrqQwKNmfdct skZolLoqVSbZieVayTQj5Zb/kqzatohTnb99SNjle3UVkcWo7A1KUxHATiKeARQLlB WjF224kN2hX/0ztPcQOpbj1Is1T1y0RjG457NlEjZEjvLUGVNx+61bFDYV1ljMPfYV zA69skxAww3/A== From: Bjorn Helgaas To: linux-pci@vger.kernel.org Cc: Jon Pan-Doh , Karolina Stolarek , Weinan Liu , Martin Petersen , Ben Fuller , Drew Walton , Anil Agrawal , Tony Luck , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Sathyanarayanan Kuppuswamy , Lukas Wunner , Jonathan Cameron , Sargun Dhillon , "Paul E . McKenney" , Mahesh J Salgaonkar , Oliver O'Halloran , Kai-Heng Feng , Keith Busch , Robert Richter , Terry Bowman , Shiju Jose , Dave Jiang , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Bjorn Helgaas Subject: [PATCH v8 19/20] PCI/AER: Add ratelimits to PCI AER Documentation Date: Thu, 22 May 2025 18:21:25 -0500 Message-ID: <20250522232339.1525671-20-helgaas@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250522232339.1525671-1-helgaas@kernel.org> References: <20250522232339.1525671-1-helgaas@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Jon Pan-Doh Add ratelimits section for rationale and defaults. [bhelgaas: note fatal errors are not ratelimited] Signed-off-by: Karolina Stolarek Signed-off-by: Jon Pan-Doh Tested-by: Krzysztof Wilczyński Reviewed-by: Kuppuswamy Sathyanarayanan Acked-by: Paul E. McKenney Signed-off-by: Bjorn Helgaas Link: https://patch.msgid.link/20250520215047.1350603-17-helgaas@kernel.org --- Documentation/PCI/pcieaer-howto.rst | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/Documentation/PCI/pcieaer-howto.rst b/Documentation/PCI/pcieaer-howto.rst index f013f3b27c82..6fb31516fff1 100644 --- a/Documentation/PCI/pcieaer-howto.rst +++ b/Documentation/PCI/pcieaer-howto.rst @@ -85,6 +85,18 @@ In the example, 'Requester ID' means the ID of the device that sent the error message to the Root Port. Please refer to PCIe specs for other fields. +AER Ratelimits +-------------- + +Since error messages can be generated for each transaction, we may see +large volumes of errors reported. To prevent spammy devices from flooding +the console/stalling execution, messages are throttled by device and error +type (correctable vs. non-fatal uncorrectable). Fatal errors, including +DPC errors, are not ratelimited. + +AER uses the default ratelimit of DEFAULT_RATELIMIT_BURST (10 events) over +DEFAULT_RATELIMIT_INTERVAL (5 seconds). + AER Statistics / Counters ------------------------- -- 2.43.0