Re: [PATCH v1] net-sysfs: expose number of link up/down transitions

[Eric Dumazet]

On Fri, 2014-03-28 at 09:51 -0700, Florian Fainelli wrote:
> 2014-03-27 23:25 GMT-07:00 Jiri Pirko <jiri@xxxxxxxxxxx>:
> >
> > If this is exposed in sysfs, this needs to be exposed via RT netlink as
> > well.
> 
> This makes me wonder if this really needs to be a kernel-maintained
> pair of counters. Since this seems to be useful for monitoring e.g:
> servers for link flapping, I would assume that some user-space
> script/program does read these sysfs entries periodically to report a
> healthy link. If that's the case, what prevents the same
> script/program from listening to netlink events and count the link
> UP/DOWN events from there and report that?

The same would be true for any counter in networking stack...

I do not feel we need to have a daemon running to 'count' events.

I like being able to run "ip -s link" , "ifconfig -a" or "nstat -a"
without having to connect to a daemon. This daemon will likely have
different api / constraints from distro to distro.

To me, first thing is a counter, then eventually events for daemons.

drop_monitor could eventually disappear if we had counters everywhere we
need them.



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