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Adding routes on Dell EMC S4248FB(L)-ON is slow #40

Closed hpersh closed 6 years ago

hpersh commented 6 years ago

In a scaled BGP environment (32x ECMP with 124,000 routes), reconvergence of the routing table after a link flap event takes significantly longer than on other platforms.

Suspected root cause is that the default QoS settings for the S4248FB/L platform are throttling control plane packets destined for the CPU.

jeff-yin commented 6 years ago

Fixed by https://github.com/open-switch/opx-platform-config/commit/274dbc0b497e4ceb471bdd1cbf6a230c505b3b24 . Will be available in OPX 3.0.0. However, while the S4200 does perform much better (wrt BGP w/ ECMP convergence) than it did before, it is still a little slower than the Z9100. The team will continue to look into this as part of a separate effort.