netdev - Re: [PATCH net-next 0/5] sctp: use transport hashtable to replace association's with rhashtable

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Message-ID: <20151230173202.GB16270@localhost.localdomain>
Date:	Wed, 30 Dec 2015 15:32:02 -0200
From:	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Xin Long <lucien.xin@...il.com>,
	network dev <netdev@...r.kernel.org>,
	linux-sctp@...r.kernel.org, mleitner@...hat.com,
	vyasevic@...hat.com, daniel@...earbox.net, davem@...emloft.net
Subject: Re: [PATCH net-next 0/5] sctp: use transport hashtable to replace
 association's with rhashtable

On Wed, Dec 30, 2015 at 12:19:39PM -0500, Eric Dumazet wrote:
> On Wed, 2015-12-30 at 23:50 +0800, Xin Long wrote:
> 
> > besides, this patchset will use transport hashtable to replace
> > association hashtable to lookup with rhashtable api. get transport
> > first then get association by t->asoc. and also it will make tcp
> > style work better.
> 
> SCTP already has a hash table, why not simply changing the way items are
> hashed into it ?

Because Vlad asked to split the patch so it gets easier to review. The
direct change was quite big.

> Sure, storing thousands of sockets in a single hash bucket is not wise.
> 
> Switching SCTP to rhashtable at this moment is premature, it is still
> moving fast.

Dave and Vlad had asked in the first review for considering using
rhashtable (ok, Dave didn't mention it by name).  We did, and it seemed
nice beside 1 issue Xin found, regarding multiple rehashing, which I'll
highlight in a reply right away. 
Said all this, I know this was your second email already against this
usage, but I have to ask, sorry: still really against it?

Initial post was with subject:
[PATCH net] sctp: support global vtag assochash and per endpoint
s(d)port assochash table

Thanks,
Marcelo

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