linux-kernel - Re: [PATCH 1/2] ipmr: Make cache queue length configurable

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Message-ID: <20190307074029.3f1f0c28@shemminger-XPS-13-9360>
Date:   Thu, 7 Mar 2019 07:40:29 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Brodie Greenfield <brodie.greenfield@...iedtelesis.co.nz>
Cc:     davem@...emloft.net, kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        chris.packham@...iedtelesis.co.nz,
        luuk.paulussen@...iedtelesis.co.nz
Subject: Re: [PATCH 1/2] ipmr: Make cache queue length configurable

On Thu,  7 Mar 2019 09:19:55 +1300
Brodie Greenfield <brodie.greenfield@...iedtelesis.co.nz> wrote:

> +ip_mr_cache_queue_length - INTEGER
> +	Limit the number of multicast packets we can have in the queue to be
> +	resolved.
> +	Bear in mind that when an unresolved multicast packet is received,
> +	there is an O(n) traversal of the queue. This should be considered
> +	if increasing.
> +

Why not make it to a unsigned value? A negative value doesn't make
much sense here.

Although other sysctl values date back to a time when Linux was
sloppy about allowing negative values, it would be good to use unsigned
now.