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

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Message-ID: <56180147.6070205@iogearbox.net>
Date:	Fri, 09 Oct 2015 20:02:47 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	Tom Herbert <tom@...bertland.com>
CC:	Eric Dumazet <edumazet@...gle.com>,
	"David S . Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Tobias Klauser <tklauser@...tanz.ch>
Subject: Re: [PATCH net-next 0/4] tcp: better smp listener behavior

On 10/09/2015 12:50 PM, Eric Dumazet wrote:
> On Thu, 2015-10-08 at 20:42 -0700, Tom Herbert wrote:
>> 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 ? :-)
>
> IPv4 only (mostly because I was using trafgen and its csumtcp() only
> deals with IPv4 and I am lazy)

Agreed, will fix that in trafgen. ;) Thanks!
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