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[Will <question285063@xxxxxxxxxxxxxxxxxxxxx>]

Question #285063 on Graphite changed:
https://answers.launchpad.net/graphite/+question/285063

Will gave more information on the question:
I applied these kernel parameter tweaks to sysctl.conf:

=====

vm.min_free_kbytes = 131072
vm.dirty_ratio = 40
vm.dirty_background_ratio = 20

net.ipv4.tcp_rmem = 4096 87380 16777216
net.core.rmem_max = 16777216
net.core.rmem_default = 16777216

net.ipv4.tcp_wmem = 4096 65536 16777216
net.core.wmem_max = 16777216
net.core.wmem_default = 16777216

net.ipv4.tcp_slow_start_after_idle = 0

net.ipv4.tcp_max_syn_backlog = 4096

net.core.netdev_max_backlog = 2500

=====

The only remaining problem is that carbon-cache instances a and f seem
to be maxing out their caches with reasonable frequency.

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