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neigh: enable garbage collection #1068

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neigh: enable garbage collection #1068

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8 changes: 8 additions & 0 deletions chef/cookbooks/network/templates/default/sysctl_10gbe.conf.erb
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Expand Up @@ -6,6 +6,14 @@
net.ipv4.ip_local_reserved_ports = 35357
# Increase system IP port range to allow for more concurrent connections
net.ipv4.ip_local_port_range = 27018 64999
# ensure STALE neighbor entries expire from the cache, otherwise
# VIPs of an OpenStack service or the floating IP of a VM
# might not become reachable
# gc_thresh1 is the lower threshold that needs to be reached before
# stale entries are getting garbage collected. The default of 128 means
# small clouds never get garbage collection and consequently suffer
# from reachability issues
net.ipv4.neigh.default.gc_thresh1 = 0

#- from https://fasterdata.es.net/host-tuning/linux/
# allow testing with buffers up to 128MB
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