On Thu, Mar 24, 2016 at 10:55 AM, Daniel Borkmann [off-list ref] wrote:

On 03/24/2016 06:26 PM, Tom Herbert wrote:

quoted

I completely agree with this, but I wonder if we now need a repository
of useful BPF modules. So in the case of implementing functionality
like in SO_REUSEPORT_LISTEN_OFF that might just become a common BPF
program we could direct people to use.

Good point. There's tools/testing/selftests/net/ containing already
reuseport
BPF example, maybe it could be extended.

I would appreciate a conceptual description on how this would work
especially for a common scenario
as described by Willy. My initial impression was that a coordinator
(master) process takes this
responsibility to adjust BPF filters as children come and go.

Two popular software has similar use cases: nginx and haproxy. Another
concern is with the
introduction of BPF itself, should we expect a performance drop in
these applications?

Best Regards,
Tolga Ceylan