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Cisco Bug: CSCvs24130 - Event Manager libevent batch processing

Last Modified

Sep 02, 2020

Products (11)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9910 Router
  • Cisco IOS XR Software
  • Cisco ASR 9922 Router
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9901 Router
  • Cisco ASR 9912 Router
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Known Affected Releases


Description (partial)

Some protocols like LDP require interactions with Event Manager. In Highly scaled environments (e.g. over 1000 LDP sessions with aggressive timers) we can see delay in these communications leading to protocol flaps.

Currently EVM initiates epoll_wait and processes only single item even for a grant for multiple File Descriptors.
This creates a delay as epoll_wait has to re-run number of times equal to initial number of items to process.

Batch processing will help to run multiple events at a time once grant for FD is given.

High scale protocol deployment ? e.g. LDP (>1000 sessions with aggressive timers (10/30 or 15/45))

APP requests long list (1000-2000) of FD's to access through event manager
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