Bug 1384746 added section on tuning sysctl values

[bfallonf]

As per: https://bugzilla.redhat.com/show_bug.cgi?id=1384746

@jeremyeder @jmencak @ahardin-rh as per email.

I changed around some of the wording. Any thoughts?

[jmencak]

Rewording seems good to me.

[ahardin-rh]

link:https://access.redhat.com/solutions/1305833[custom tuned profile]

[ahardin-rh]

Just one comment. Otherwise, LGTM. Thanks!

[jeremyeder]

s/In clusters, t/T

[jeremyeder]

When this issue occurs, you may begin to see the oc client commands being to fail with the following error:

[jeremyeder]

s/recommended/suggested for clusters with large numbers of routes.

Note: we should state which machine this needs to be run on...nodes running router pods only, right? So, most likely the infra nodes?

[jmencak]

This is correct, I've seen nodes running router pods affected with this only. So, perhaps something like this?

The following sysctl values are suggested for clusters with large numbers of routes on infra nodes running router pods:

[jeremyeder]

ack

[bfallonf]

Added a sentence on running it on the router pods. There's a chance it won't be on the infra nodes, but if so, it'll be easier to find.

[jmencak]

Please remove now duplicate lines 1371-1373.

[bfallonf]

@jmencak Thanks for that. Mistake on my part.

@adellape @ahardin-rh @gaurav-nelson peer review please?

[bfallonf]

[rev_history]
|xref:../install_config/router/default_haproxy_router.adoc#install-config-router-default-haproxy[Setting up a Router -> Using the Default HAProxy Router]
|Added the xref:../install_config/router/default_haproxy_router.adoc#deploy-router--arp-cach-tuning-for-large-scale-clusters[ARP Cache Tuning for Large-scale Clusters] section.
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[ahardin-rh]

extra }

[ahardin-rh]

extra - here (router--arp-cach)

[ahardin-rh]

Just 2 minor comments. Otherwise, LGTM.

[bfallonf]

Thanks @ahardin-rh . I'll merge away.