Subject: Re: [PATCH] neighbour: guarantee the localhost connections be established successfully even the ARP table is full

From: Jakub Kicinski <[email-masked]>
Date: Mon, 15 Apr 2024 11:07:52 -0700

On Fri, 12 Apr 2024 20:25:38 +0800 Zheng Li wrote:
> Inter-process communication on localhost should be established successfully even the ARP table is full,
> many processes on server machine use the localhost to communicate such as command-line interface (CLI),
> servers hope all CLI commands can be executed successfully even the arp table is full.
> Right now CLI commands got timeout when the arp table is full.
> Set the parameter of exempt_from_gc to be true for LOOPBACK net device to
> keep localhost neigh in arp table, not removed by gc.
> 
> the steps of reproduced:
> server with "gc_thresh3 = 1024" setting, ping server from more than 1024 IPv4 addresses,
> run "ssh localhost" on console interface, then the command will get timeout.

Please repost this and CC appropriate maintainers.

scripts/get_maintainer doesn't bite.
-- 
pw-bot: cr