[c-nsp] IPC-5-WATERMARK messages - FAST.control.RIL?

[Andrew Fort]

With ws-sup720 cards (original flavour), we occasionally get syslog 
about high watermarks on IPC queues across multiple switches within 
minutes of each other.

The switches exhibiting this have a full table, and are RRs for about 5 
other similar boxes, each (which get a filtered table (~12k prefixes), 
and don't exhibit this message).

Thus, I'm guessing there's some churn and the IPC messages for DCEF are 
backing up..

The slots in question are WS-X6816 w/DFC-3A.

w/12.2(18)SXD3
3960: 000602: May 17 04:55:39.442 AEST: %IPC-5-WATERMARK: 801 messages 
pending in xmt for the port Slot 8: FAST.control.RIL(2080000.C) seat 2080000

w/12.2(17)SXA
589210: 035375: May 14 04:56:21.304 AEST: %IPC-5-WATERMARK: 801 messages 
pending in xmt for the port (2080000.C) seat 2080000

Nice to get a message for the dereference in the newer code, but what is 
"FAST.control.RIL"?

It's always '801' messages (is the queue depth for this type of message 
effectively 800?), and the port is always (2010000.C) or (2080000.C).

e.g.

1481: 000356: Jun 3 12:57:55.214 AEST: %IPC-5-WATERMARK: 801 messages 
pending in xmt for the port Slot 1: FAST.control.RIL(2010000.C) seat 2010000
1145: 000203: Jun 3 12:56:55.989 AEST: %IPC-5-WATERMARK: 801 messages 
pending in xmt for the port Slot 8: FAST.control.RIL(2080000.C) seat 2080000

This isn't associated with any network disruption, but is it a sign of 
future bad ju-ju or some impending resource limit? (considering these 
are PFC-3A/DFC-3A combos, after all).

Cheers,
-Andrew