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Date:      Fri, 23 Jan 2015 20:36:26 +0000
From:      Matthew Seaman <matthew@FreeBSD.org>
To:        Stephen Hurd <shurd@sasktel.net>, Baptiste Daroussin <bapt@freebsd.org>, ports-committers@freebsd.org, svn-ports-all@freebsd.org, svn-ports-head@freebsd.org
Subject:   Re: svn commit: r377746 - head/ports-mgmt/pkg
Message-ID:  <54C2B0CA.7040204@FreeBSD.org>
In-Reply-To: <54C298A6.4060002@sasktel.net>
References:  <201501231557.t0NFvKFE047114@svn.freebsd.org> <54C298A6.4060002@sasktel.net>

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On 2015/01/23 18:53, Stephen Hurd wrote:
> Baptiste Daroussin wrote:
>>   - Use SI symbols (MiB instead of MB)
> Just a quick nit, SI doesn't define storage units (bits nor bytes - and
> B is bel in SI), and the 'Mi' et al. prefixes aren't SI either, they're
> IEC... so this is a change from incorrectly used SI prefixes to
> correctly used IEC ones.
Technically, no, they're not strictly part of SI, but they're endorsed by
the BIPM for use alongside SI units
(http://www.bipm.org/en/publications/si-brochure/chapter3.html).
and more importantly, the BIPM forbids the use of the SI prefixes to mean
powers-of-2 multipliers.

B for 'byte' is an accepted usage, and unlikely to be confused with B for
'Bel' (also not an SI unit, and in any case almost never seen as anything
other than dB.)  I don't believe this to be a problem.  If we ever have to
worry about measuring anything to do with package management in dB, then
we can certainly revisit the whole subject.

    Cheers,

    Matthew
 



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