netdev - RE: [Patch] Establishing more than 64K outgoing TCP connections

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Message-ID: <241CE5A1B2AFFA4987A663380D74C0BB3FFDA39997@MBX73.ad2.softcom.biz>
Date:	Fri, 7 Nov 2008 17:37:33 -0500
From:	Yavor Goulishev <yavor@...plifymedia.com>
To:	David Miller <davem@...emloft.net>
CC:	"zbr@...emap.net" <zbr@...emap.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [Patch] Establishing more than 64K outgoing TCP connections

> Therefore, if you use some idea like using saddr or daddr in the hash
> function, then a listening socket bind will have to walk the entire table
> to see if any socket exists already bound to that port.

It is not the entire table. It is O(number_of_local_interfaces).
In general, if you have more then one interface you either need to flatten the
ip/port space and have a smart way to access it in O(1) or you have the O(number_of_local_interfaces).
The case of ANY can be solved with special ANY interface. So you can get O(1) even there, but the space will grow.

--Yavor

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