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Date:      Sun, 15 Dec 2013 01:40:22 -0500
From:      Ryan Stone <rysto32@gmail.com>
To:        Adrian Chadd <adrian@freebsd.org>
Cc:        freebsd-net <freebsd-net@freebsd.org>
Subject:   Re: buf_ring in HEAD is racy
Message-ID:  <CAFMmRNz9P9ZnCRFEEdAgPxzaCUXFts=5Rs64zi3x=BDJa_7nWQ@mail.gmail.com>
In-Reply-To: <CAJ-VmonJG-M_f_m36f-z3ArumBKNdt5%2B6muwFJzWABRxRQWJaw@mail.gmail.com>
References:  <CAFMmRNyJpvZ0AewWr62w16=qKer%2BFNXUJJy0Qc=EBqMnUV3OyQ@mail.gmail.com> <CAJ-VmonJG-M_f_m36f-z3ArumBKNdt5%2B6muwFJzWABRxRQWJaw@mail.gmail.com>

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On Sat, Dec 14, 2013 at 7:06 PM, Adrian Chadd <adrian@freebsd.org> wrote:
> oh cool, you just did the output-drops thing I was about to code up.
> We're missing those counters at work and the ops guys poked me about
> it.
>
> I'll also give that a whirl locally and see about working with jack to
> get it into -HEAD / MFC'ed to 10.
>
> Thanks!

The reason why I call it hacky is because these drops are properly
categorized as discards, not errors.  But there's not currently a
really good way to distinguish between the two in FreeBSD right now
(there is the drops counter in the if_snd queue but netstat seemed to
be ignoring that even with -d specified and blindly overwriting it
would seem to be incompatible with altq anyway)



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