netdev - Re: [PATCH net-next 0/4] tcp: better smp listener behavior

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Message-ID: <CALx6S35NOaLyqmWbgcRdV9Swm1NVVSFkoShW0ywMi7V21jhtYQ@mail.gmail.com>
Date:	Thu, 8 Oct 2015 20:42:04 -0700
From:	Tom Herbert <tom@...bertland.com>
To:	Eric Dumazet <edumazet@...gle.com>
Cc:	"David S . Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH net-next 0/4] tcp: better smp listener behavior

On Thu, Oct 8, 2015 at 8:37 AM, Eric Dumazet <edumazet@...gle.com> wrote:
> As promised in last patch series, we implement a better SO_REUSEPORT
> strategy, based on cpu affinities if selected by the application.
>
> We also moved sk_refcnt out of the cache line containing the lookup
> keys, as it was considerably slowing down smp operations because
> of false sharing. This was simpler than converting listen sockets
> to conventional RCU (to avoid sk_refcnt dirtying)
>
> Could process 6.0 Mpps SYN instead of 4.2 Mpps on my test server.
>
Is this IPv4, IPv6, or some combination of the two ? :-)

> Eric Dumazet (4):
>   net: SO_INCOMING_CPU setsockopt() support
>   net: align sk_refcnt on 128 bytes boundary
>   net: shrink struct sock and request_sock by 8 bytes
>   tcp: shrink tcp_timewait_sock by 8 bytes
>
>  include/linux/tcp.h              |  4 ++--
>  include/net/inet_timewait_sock.h |  2 +-
>  include/net/request_sock.h       |  7 +++----
>  include/net/sock.h               | 37 +++++++++++++++++++++++++++----------
>  net/core/sock.c                  |  5 +++++
>  net/ipv4/inet_hashtables.c       |  5 +++++
>  net/ipv4/syncookies.c            |  4 ++--
>  net/ipv4/tcp_input.c             |  2 +-
>  net/ipv4/tcp_ipv4.c              |  2 +-
>  net/ipv4/tcp_minisocks.c         | 18 +++++++++---------
>  net/ipv4/tcp_output.c            |  2 +-
>  net/ipv4/udp.c                   | 12 +++++++++++-
>  net/ipv6/inet6_hashtables.c      |  5 +++++
>  net/ipv6/syncookies.c            |  4 ++--
>  net/ipv6/tcp_ipv6.c              |  2 +-
>  net/ipv6/udp.c                   | 11 +++++++++++
>  16 files changed, 87 insertions(+), 35 deletions(-)
>
> --
> 2.6.0.rc2.230.g3dd15c0
>
> --
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