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

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Message-ID: <20110225125644.GA9763@canuck.infradead.org>
Date:	Fri, 25 Feb 2011 07:56:44 -0500
From:	Thomas Graf <tgraf@...radead.org>
To:	Tom Herbert <therbert@...gle.com>,
	Bill Sommerfeld <wsommerfeld@...gle.com>
Cc:	Daniel Baluta <daniel.baluta@...il.com>, netdev@...r.kernel.org
Subject: Re: SO_REUSEPORT - can it be done in kernel?

On Thu, Jan 27, 2011 at 01:32:25PM -0800, Tom Herbert wrote:
> Yes, we are still planning this.  The UDP implementation for my
> earlier patch should be usable to try for DNS/UDP-- this is in fact
> where we saw a major performance gain.  Eric Dumazet had some nice
> improvements that should probably be looked at also.

I can confirm this.

Serious scalability issues have been reported on a 12 core system
running bind 9.7-2. The system was only able to deliver ~110K queries
per second.

Using your SO_REUSEPORT patch and a modified bind using it. The same
system is able to deliver ~650K queries per seconds while maxing out
all cores completely.

Tom, Bill: do you have a timeline for merging this? Especially the
UDP bits?

-Thomas
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