As tx timestamp timeout is something multiple users encounter,
provide information for configuring kthread priorities in manual
for ptp4l where tx_timestamp_timeout is already described.
Signed-off-by: Lukasz Plachno <lukasz.plac...@intel.com>
---
ptp4l.8 | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/ptp4l.8 b/ptp4l.8
index 09ff108af102..02143eec36a2 100644
--- a/ptp4l.8
+++ b/ptp4l.8
@@ -1032,6 +1032,26 @@ to maintain the correct offset between UTC and PTP
times. See
.BR phc2sys (8)
manual page for more details.
+.SH KTHREAD PRIORITY
+
+In case of following log:
+.br
+.I timed out while polling for tx timestamp
+.I increasing tx_timestamp_timeout or increasing
+.I kworker priority may correct this issue,
+.I but a driver bug likely causes it
+.br
+one of possible causes is kworker processing timestamps being starved,
+user might try manually increasing the priority of the kworker.
+
+Example for Intel E810 card:
+.br
+.I pgrep \-fl ice-ptp | cut \-f1 \-d' ' | xargs \-I {} sudo chrt \-r \-\-pid
30 {}
+
+Each NIC driver assigns a different name for kworkers, in some cases
+processing timestamps might not be using kworker at all. Also assigning
+too high priority might lead to system becoming unstable.
+
.SH SEE ALSO
.BR pmc (8),
.BR phc2sys (8)
--
2.34.1
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