netdev - Re: SO_REUSEPORT - can it be done in kernel?

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Date:	Fri, 25 Feb 2011 15:33:26 -0800
From:	Bill Sommerfeld <wsommerfeld@...gle.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	Daniel Baluta <daniel.baluta@...il.com>, netdev@...r.kernel.org,
	Thomas Graf <tgraf@...radead.org>
Subject: Re: SO_REUSEPORT - can it be done in kernel?

On Fri, Feb 25, 2011 at 11:51, Tom Herbert <therbert@...gle.com> wrote:
>> Tom, Bill: do you have a timeline for merging this? Especially the
>> UDP bits?
> Bill has been working on the TCP implementation which is requiring
> some fairly major surgery on the listener connections in syn-rcvd
> state, this is ongoing.

Yup.  The broad approach I settled on is to delay binding of new
connections to listener sockets by moving receive_sock's from a
per-listen_sock hash table to new hash chains in the global hash
table.

This is very much a work-in-progress.  I'm part way through the
conversion and have running code with most of the new structures in
place in parallel with the old; I'm about to start relying exclusively
on the new, and then will tear down the old; once that's done I'll be
in a position to hook that up to SO_REUSEPORT and start actually
measuring the difference.  In short: it will be a while.

So splitting SO_REUSEPORT for UDP from SO_REUSEPORT for TCP makes a
lot of sense to me.
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