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

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Message-ID: <20240415110752.30f6733b@kernel.org>
Date: Mon, 15 Apr 2024 11:07:52 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Zheng Li <lizheng043@...il.com>
Cc: netdev@...r.kernel.org, bpf@...r.kernel.org, davem@...emloft.net,
 jmorris@...ei.org, James.Z.Li@...l.com
Subject: Re: [PATCH] neighbour: guarantee the localhost connections be
 established successfully even the ARP table is full

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.

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