From: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Date: Tue, 24 Feb 2015 20:48:10 +0100
> 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?
Let's fix as much crap as we can in -net. I'm going to have to do
a huge backport of all the rhashtables to -stable at some point
too.
> 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. ;)
Yes, good idea :)
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