Date: Wed, 19 Aug 2020 00:18:54 +0200 From: Marko Zec <zec@fer.hr> To: Ryan Stone <rysto32@gmail.com> Cc: freebsd-net <freebsd-net@freebsd.org> Subject: Re: Is anybody using ng_pipe? Message-ID: <20200819001854.3c6887fa@x23> In-Reply-To: <CAFMmRNymC0aa8G0y_-3CM-puK_ZyR%2Brfdp%2B1Pk=NkxEkX8PvAg@mail.gmail.com> 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> <CAFMmRNymC0aa8G0y_-3CM-puK_ZyR%2Brfdp%2B1Pk=NkxEkX8PvAg@mail.gmail.com>
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On Tue, 18 Aug 2020 18:04:24 -0400 Ryan Stone <rysto32@gmail.com> wrote: > 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. Yeah, I only saw that a few minutes ago... Fixed in r364367. Cheers Marko
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