netdev - Re: [PATCH net-next v2] net: Add sysctl to toggle early demux for tcp and udp

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Date:   Sat, 18 Mar 2017 20:07:22 -0600
From:   Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
To:     Tom Herbert <tom@...bertland.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Stephen Hemminger <stephen@...workplumber.org>,
        netdev-owner@...r.kernel.org
Subject: Re: [PATCH net-next v2] net: Add sysctl to toggle early demux for tcp
 and udp

> Less than 1% performance improvement in a benchmark doesn't justify
> the complexity of the patch. Eric's hypothesis was that an unconnected
> UDP socket may show issues because of cache misses in look-ups due to
> so many different sources. This should be fairly easy to benchmark by
> randomly setting source address in your test (IP any and routing my
> need to be set appropriately).
> 

With different source addresses, a larger increase is seen here
(633->654Mbps).

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