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[v5,7/8] PCI/AER: Add ratelimits to PCI AER Documentation

Message ID 20250321015806.954866-8-pandoh@google.com (mailing list archive)
State New
Delegated to: Bjorn Helgaas
Headers show
Series Rate limit AER logs | expand

Commit Message

Jon Pan-Doh March 21, 2025, 1:58 a.m. UTC 
Add ratelimits section for rationale and defaults.

Signed-off-by: Karolina Stolarek <karolina.stolarek@oracle.com>
Signed-off-by: Jon Pan-Doh <pandoh@google.com>
Reported-by: Sargun Dhillon <sargun@meta.com>
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 Documentation/PCI/pcieaer-howto.rst | 11 +++++++++++
 1 file changed, 11 insertions(+)
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Patch

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).
+
+AER uses the default ratelimit of DEFAULT_RATELIMIT_BURST (10 events) over
+DEFAULT_RATELIMIT_INTERVAL (5 seconds).
+
 AER Statistics / Counters
 -------------------------