Skip site navigation (1)Skip section navigation (2)
Date:      Sat, 28 Mar 2015 23:22:16 -0400
From:      Benjamin Kaduk <bjkfbsd@gmail.com>
To:        John-Mark Gurney <jmg@funkthat.com>
Cc:        "src-committers@freebsd.org" <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, Gleb Smirnoff <glebius@freebsd.org>, Slawa Olhovchenkov <slw@zxy.spb.ru>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, Fabien Thomas <fabient@freebsd.org>
Subject:   Re: svn commit: r280759 - head/sys/netinet
Message-ID:  <CAJ5_RoBKOA5JFnxupzSKpcA8Mf-H0Ep7mrJEboQ97w-9_AUJ%2Bg@mail.gmail.com>
In-Reply-To: <20150329011534.GH51048@funkthat.com>
References:  <201503271326.t2RDQxd3056112@svn.freebsd.org> <20150328083443.GV64665@FreeBSD.org> <20150328172313.GC51048@funkthat.com> <20150328181833.GX64665@FreeBSD.org> <20150328204333.GF51048@funkthat.com> <20150328213403.GB74532@zxy.spb.ru> <20150329011534.GH51048@funkthat.com>

next in thread | previous in thread | raw e-mail | index | archive | help
On Sat, Mar 28, 2015 at 9:15 PM, John-Mark Gurney <jmg@funkthat.com> wrote:

> Slawa Olhovchenkov wrote this message on Sun, Mar 29, 2015 at 00:34 +0300:
> > On Sat, Mar 28, 2015 at 01:43:33PM -0700, John-Mark Gurney wrote:
> >
> > In this case may be do range allocation of ID (per-CPU)?
> > For example, allocate 128 ID, not one ID?
>
> Do you mean what to do in the case of an atomic packet?
>
> Per RFC:
>    In atomic datagrams, the IPv4 ID field has no meaning; thus, it can
>    be set to an arbitrary value, i.e., the requirement for non-repeating
>    IDs within the source address/destination address/protocol tuple is
>    no longer required for atomic datagrams:
>
> You can just set it to 0, or any value we feel like.
>

My reading was to give each CPU its own range from which to allocate IDs,
to guarantee that there are no collisions between CPUs.

-Ben



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAJ5_RoBKOA5JFnxupzSKpcA8Mf-H0Ep7mrJEboQ97w-9_AUJ%2Bg>