Re: Improving use of rt_refcnt

[Ryota Ozaki <ozaki-r%netbsd.org@localhost>]

On Sun, Jul 5, 2015 at 2:35 AM, David Young <dyoung%pobox.com@localhost> wrote:
> On Sat, Jul 04, 2015 at 09:52:56PM +0900, Ryota Ozaki wrote:
>> I'm trying to improve use of rt_refcnt: reducing
>> abuse of it, e.g., rt_refcnt++/rt_refcnt-- outside
>> route.c and extending it to treat referencing
>> during packet processing (IOW, references from
>> local variables) -- currently it handles only
>> references between routes. The latter is needed for
>> MP-safe networking.
>
> Do you propose to increase/decrease rt_refcnt in the packet processing
> path, using atomic instructions?

Atomic instructions aren't used yet, i.e., softnet_lock is still needed.
I will introduce them later. (Using refcount(9) by riastradh would be
good once it is committed.)

  ozaki-r

>
> Dave
>
> --
> David Young
> dyoung%pobox.com@localhost    Urbana, IL    (217) 721-9981