netdev - Re: [ANN] Unified dynamic storage for different socket types instead of separate hash tables.

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Date:	Thu, 22 Mar 2007 22:40:25 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	David Miller <davem@...emloft.net>
Cc:	shemminger@...ux-foundation.org, netdev@...r.kernel.org
Subject: Re: [ANN] Unified dynamic storage for different socket types instead of separate hash tables.

On Thu, Mar 22, 2007 at 12:36:04PM -0700, David Miller (davem@...emloft.net) wrote:
> > > 2) An extra list insert/delete to give list of all sockets
> > 
> > That is too small price.
> 
> In your imagination.  Our connection rates went up significantly
> when I got rid of the linked list we had many years ago.
> 
> Every memory access matters.

Ok, I never liked linked lists actually. :)

This one can be completely eliminated (hmm, it does not even exist so
far) by having per-node bitmask of used/free entries - it will be 
even faster than existing access and will not require locks (due to RCU
protection).

So, this allows to remove additional hlist_node structure from socket
(and change netlink one to not use it in broadcasting, so for netlink
sockets it will be moved into private netlink structure).

-- 
	Evgeniy Polyakov
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