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Date: Tue, 2 Feb 2016 23:44:47 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Luigi Rizzo <rizzo@iet.unipi.it>
Cc: Adrian Chadd <adrian.chadd@gmail.com>,
 "stable@freebsd.org" <stable@freebsd.org>
Subject: Re: 82576 + NETMAP + VLAN
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On Thu, Oct 22, 2015 at 11:24:53AM -0700, Luigi Rizzo wrote:

> On Thu, Oct 22, 2015 at 11:12 AM, Adrian Chadd <adrian.chadd@gmail.com> wrote:
> > On 22 October 2015 at 09:35, Slawa Olhovchenkov <slw@zxy.spb.ru> wrote:
> >> On Sun, Oct 18, 2015 at 07:45:52PM -0700, Adrian Chadd wrote:
> >>
> >>> Heh, file a bug with luigi; it should be defined better inside netmap itself.
> >>
> >> I am CC: luigi.
> >>
> >> Next question: do kevent RX/TX sync?
> >> In my setup I am need to manual NIOCTXSYNC/NIOCRXSYNC.
> >
> > Hi,
> >
> > Nope. kqueue() doesn't do the implicit sync like poll() does; it's
> > just the notification path.
> 
> actually not. When the file descriptor is registered there
> is an implicit sync, and there is another one when an event
> is posted for the file descriptor.
> 
> unless there are bugs, of course.

I found strange behaivor:

1. open netmap and register in main thread
2. kevent register in different thread
3. result: got event by kevent but no ring sinc (all head,tail,cur
still 0).

Is this normal? Or is this bug?

open and registering netmap in same thread as kevent resolve this.