On 5/19/25 2:35 PM, Bjorn Helgaas wrote:
From: Jon Pan-Doh <pan...@google.com>
Add ratelimits section for rationale and defaults.
Signed-off-by: Karolina Stolarek <karolina.stola...@oracle.com>
Signed-off-by: Jon Pan-Doh <pan...@google.com>
Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
Reviewed-by: Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppusw...@linux.intel.com>
Acked-by: Paul E. McKenney <paul...@kernel.org>
---
Documentation/PCI/pcieaer-howto.rst | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/Documentation/PCI/pcieaer-howto.rst
b/Documentation/PCI/pcieaer-howto.rst
index f013f3b27c82..896d2a232a90 100644
--- a/Documentation/PCI/pcieaer-howto.rst
+++ b/Documentation/PCI/pcieaer-howto.rst
@@ -85,6 +85,17 @@ 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. uncorrectable).
Can we list exceptions like DPC and FATAL errors (if added) ?
+
+AER uses the default ratelimit of DEFAULT_RATELIMIT_BURST (10 events) over
+DEFAULT_RATELIMIT_INTERVAL (5 seconds).
+
AER Statistics / Counters
-------------------------
--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer
