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 64AF3288C86; Tue, 20 May 2025 21:51:16 +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=1747777876; cv=none; b=MphUd/juxX664ufxWKG2JiKOAVttLh4OtaD7yiolI+Rkb3rUCiDVBonfxGfsszIKLMog0eMQDH20bIMMhV+rjv75m89W/FhEAlcytvUlM3LeGFQ7eQHGC+/hzGyu1NBpJ8vaCzdqvtGLmSCTtMEN06lB6jZAJ7w41RLdOzpIPPo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747777876; c=relaxed/simple; bh=vGxhmnnQMOoDk57ET4tcLt0Mo9fvIzE4nqwWsOgS15g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Yk2Xu5wvFbXhFo/Fv0bmFQAA8I1f4Z0tfHiIUws2y3jeBrgwEH/sxKndBXcGSCSfxwZef1efdMw5yt5CXfgOFvzMSgKTS2uLhS8udos5Q34Dg8/FgYrQUi2hPNQWZ2IroqDa5TNbWlo1ZT73rqqFVaHyDjqt3EaAl9v3iawKtuk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oQ+UUhc1; 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="oQ+UUhc1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E8EBC4CEE9; Tue, 20 May 2025 21:51:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1747777876; bh=vGxhmnnQMOoDk57ET4tcLt0Mo9fvIzE4nqwWsOgS15g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oQ+UUhc16ctu9jd/RKklHzZ4tIDsOC0RQIU2iFmhql03I1hZ+F2O3um5Ji8DBqcUO mSnTPGZzGSVTHSb8YTkf4spLiZ0nZQQ1O/qvTaDX7Cjq88gHpqYuZSicYWAtoBPJ1H o3hBMPPyu/72VdDAT0Q7UtGr9bDwJwuvA8oE5MakCFBYPTRr1P/eSOnv8ICgU2Dl9F 8dKYl7rzX9TaYvWZwTEoG9F1nUlx4n2diFYMmTJj2NctkUzvjlVje8JnQu9E0gAS8a CIwKwZfsD2bajUjV7mcFywVRKT+pBSwaOeEY7OuzGnmYgXuk2FtjGgJf2y8N3l+x65 3U2hTnqTJjMRg== 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, Bjorn Helgaas , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= Subject: [PATCH v7 16/17] PCI/AER: Add ratelimits to PCI AER Documentation Date: Tue, 20 May 2025 16:50:33 -0500 Message-ID: <20250520215047.1350603-17-helgaas@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250520215047.1350603-1-helgaas@kernel.org> References: <20250520215047.1350603-1-helgaas@kernel.org> Precedence: bulk X-Mailing-List: linux-pci@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 Signed-off-by: Bjorn Helgaas Tested-by: Krzysztof Wilczyński Reviewed-by: Kuppuswamy Sathyanarayanan Acked-by: Paul E. McKenney --- 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