lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Fri, 09 Oct 2015 03:50:45 -0700
From:	Eric Dumazet <>
To:	Tom Herbert <>
Cc:	Eric Dumazet <>,
	"David S . Miller" <>,
	netdev <>,
	Daniel Borkmann <>,
	Tobias Klauser <>
Subject: Re: [PATCH net-next 0/4] tcp: better smp listener behavior

On Thu, 2015-10-08 at 20:42 -0700, Tom Herbert wrote:
> On Thu, Oct 8, 2015 at 8:37 AM, Eric Dumazet <> 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)

I guess IPv6 one might hit some issues before reaching TCP stack, I do
not see anything performance related in TCP itself.

To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists