BBlack has submitted this change and it was merged.
Change subject: r::c::perf: un-mysterious netdev_max_backlog
......................................................................
r::c::perf: un-mysterious netdev_max_backlog
This raises from 30K to 60K and documents.
Change-Id: Iddea34f9d587b68bcccbdc45a9f8bd05f823f806
---
M modules/role/manifests/cache/perf.pp
1 file changed, 7 insertions(+), 2 deletions(-)
Approvals:
BBlack: Verified; Looks good to me, approved
diff --git a/modules/role/manifests/cache/perf.pp
b/modules/role/manifests/cache/perf.pp
index e94fc08..feaf1fa 100644
--- a/modules/role/manifests/cache/perf.pp
+++ b/modules/role/manifests/cache/perf.pp
@@ -88,8 +88,13 @@
# Increase the number of ephemeral ports
'net.ipv4.ip_local_port_range' => [ 1024, 65535 ],
- # Recommended to increase this for 1000 BT or higher
- 'net.core.netdev_max_backlog' => 30000, # 'mysterious'
+ # All prod caches are 10GbE, standard recommendation is 300K for
10G
+ # and 30K for 1G. Our inbound traffic max is closer to 1G levels,
+ # since we have 10G LVS splitting traffic to ~8 or more hosts for
+ # high-traffic clusters. Still, we should double the 1GbE numbers
+ # at least, just in case of bursts and inequality, etc. If low,
+ # will see drops in col 2 of /proc/net/softnet_stat
+ 'net.core.netdev_max_backlog' => 60000,
# Increase the queue size of new TCP connections
'net.core.somaxconn' => 4096, # 'mysterious'
--
To view, visit https://gerrit.wikimedia.org/r/295539
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Gerrit-MessageType: merged
Gerrit-Change-Id: Iddea34f9d587b68bcccbdc45a9f8bd05f823f806
Gerrit-PatchSet: 2
Gerrit-Project: operations/puppet
Gerrit-Branch: production
Gerrit-Owner: BBlack <bbl...@wikimedia.org>
Gerrit-Reviewer: BBlack <bbl...@wikimedia.org>
Gerrit-Reviewer: Ema <e...@wikimedia.org>
Gerrit-Reviewer: jenkins-bot <>
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