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Date:      Thu, 06 Dec 2012 13:24:47 -0500
From:      Jung-uk Kim <jkim@FreeBSD.org>
To:        Robert Watson <rwatson@freebsd.org>
Cc:        svn-src-projects@freebsd.org, src-committers@freebsd.org
Subject:   Re: svn commit: r243929 - projects/bpfjit
Message-ID:  <50C0E2EF.70707@FreeBSD.org>
In-Reply-To: <alpine.BSF.2.00.1212060904220.78351@fledge.watson.org>
References:  <201212060050.qB60nxXk021929@svn.freebsd.org> <alpine.BSF.2.00.1212060904220.78351@fledge.watson.org>

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On 2012-12-06 04:05:27 -0500, Robert Watson wrote:
> 
> On Thu, 6 Dec 2012, Jung-uk Kim wrote:
> 
>> Author: jkim Date: Thu Dec  6 00:49:59 2012 New Revision: 243929 
>> URL: http://svnweb.freebsd.org/changeset/base/243929
>> 
>> Log: Add an UPDATING entry for the BPF_JITTER deprecation.
> 
> Will it actually be necessary to change the kernel option name --
> my impression was that the previous JIT (and possibly the new JIT)
> are actually entirely transparent to userspace applications -- they
> keep submitting BPF filters per normal...?

Correct.

> In which case, perhaps there's no need to change the option name,
> as that would introduce an upgrade hurdle.  Or is there sufficient 
> difference that we want users to bump into it in order to
> understand that there has been an implementation change?

When I implemented the BPF_JITTER, some people complained that
"jitter" sounds pretty bad for networking guys. ;-)

Seriously, there is no serious technical reason to rename the kernel
option but I wanted to make it simpler.  Also, I don't see any
"upgrade hurdle" because BPF_JITTER was not turned on by default in
GENERIC kernels.

Jung-uk Kim
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