netdev - Re: route/max_size sysctl in ipv4

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Date:	Mon, 5 Jan 2015 16:56:18 -0800
From:	Ani Sinha <ani@...sta.com>
To:	David Miller <davem@...emloft.net>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: route/max_size sysctl in ipv4

On Mon, Jan 5, 2015 at 4:51 PM, David Miller <davem@...emloft.net> wrote:
> From: Ani Sinha <ani@...sta.com>
> Date: Mon, 5 Jan 2015 16:43:30 -0800
>
>> On Mon, Jan 5, 2015 at 4:36 PM, David Miller <davem@...emloft.net> wrote:
>>> From: Ani Sinha <ani@...sta.com>
>>> Date: Mon, 5 Jan 2015 15:48:11 -0800
>>>
>>>> I am looking at the code and it looks like since the route cache for
>>>> ipv4 was removed from the kernel, this sysctl parameter no longer
>>>> serves the same purpose. It does not look like it is even used in the
>>>> ipv4/route.c module. Is there an equivalent sysctl parameter limiting
>>>> the number of route entries in the kernel? Or is there now no
>>>> mechanism to limit the number of route entries?
>>>
>>> There is nothing to limit, since the cache was removed.
>>
>> Shouldn't the documentation be updated to reflect that? Also what's
>> the point of having a dummy variable that does nothing? Should we not
>> simply remove it?
>
> There is nothing to update, the behavior is completely transparent.
> Absolutely no cache entries exist, therefore the limit cannot be
> reached.

I disagree. You are advertising a feature in an official documentation
that simply does not exist for ipv4. This is very confusing. If I did
not dig into the code, I wouldn't know that this particular knob is a
noop since the time the route cache was removed.


>
> The sysctl is kept so that scripts reading it don't suddenly stop
> working.  We can't just remove sysctl values.
>
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