netdev - Re: [PATCH v2 1/2] rhashtable: require max_shift if grow

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Date:	Tue, 24 Feb 2015 20:48:10 +0100
From:	Daniel Borkmann <daniel@...earbox.net>
To:	David Miller <davem@...emloft.net>, johunt@...mai.com
CC:	pablo@...filter.org, kaber@...sh.net, tgraf@...g.ch,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2 1/2] rhashtable: require max_shift if grow_decision
 defined

On 02/24/2015 07:18 PM, David Miller wrote:
...
> I've already said today that I think this whole indirection stuff
> with grow and shrink decisions should simply go away.
>
> Everyone defines it to the generic rhashtable routine, therefore
> that should just be made private to lib/rhashtable.c, called
> directly, and the methods completely removed.
>
> Given that, this change makes no sense.
>
> When a limit is not specified, we should unconditionally grow rather
> than refuse to grow.  One should not be required to specify this at
> all.  If you have no idea what limit might be reasonable, you specify
> nothing at all and just let available memory be the limiting factor.

I agree.

Fwiw, I believe this behavior came in as a regression via commit
c0c09bfdc415 ("rhashtable: avoid unnecessary wakeup for worker queue").
Initially, if no max_shift was specified, we'd just expand further.

I can take care of these above two fixups tomorrow, if you want.
I presume you want to route both via -net, or just the growth limit
issue via -net?

I also have some optimizations I was working on last week for
net-next, but I would wait for a -net into -net-next merge after
that to avoid merge conflicts, if that's fine. ;)

Thanks,
Daniel
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