Date: Tue, 18 Aug 2020 18:04:24 -0400 From: Ryan Stone <rysto32@gmail.com> To: Marko Zec <zec@fer.hr> Cc: freebsd-net <freebsd-net@freebsd.org> Subject: Re: Is anybody using ng_pipe? Message-ID: <CAFMmRNymC0aa8G0y_-3CM-puK_ZyR%2Brfdp%2B1Pk=NkxEkX8PvAg@mail.gmail.com> In-Reply-To: <20200818234416.5aec459c@x23> References: <CAFMmRNxgoSNX2%2BLd=eEXRH0q7-XFzSF=b2GPzZgNW1LDCvq5Xw@mail.gmail.com> <CAFMmRNwAQ-x2p1CGnzyEuDREtuwS8w4SiQCqwNoKKNWxREQ_cQ@mail.gmail.com> <20200818205725.2e03c8cb@x23> <CAFMmRNyGu-vUgCsDjjDmX9YcEAhCDD-tZHeFJzRtaCOx-bCrgw@mail.gmail.com> <20200818234416.5aec459c@x23>
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On Tue, Aug 18, 2020 at 5:43 PM Marko Zec <zec@fer.hr> wrote:
> Since in ng_pipe we define BER as an one error in BER bits (integer
> value), wouldn't your formula P = 1 - BER yield results less than or
> equal to zero for all non-zero values of BER? The domain of P is
> [0..1], so that won't fly.
>
> Your analysis seems to be based on an assumption that the BER
> parameter is given as a multiplier to 0.5**48, which it is not.
>
> The proper fix would be to clarify the current BER parameter semantics
> in ng_pipe(4), not to break bridges with the existing scripts / software
> which rely on ng_pipe.
>
> Cheers,
>
> Marko
The manpage defined the BER parameter as follows:
u_int64_t ber; /* errors per 2^48 bits */
If we instead want to change the documentation to match the
implementation, that's fine too.
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