Date: Sat, 2 Nov 2013 22:35:59 +0000 From: Mark R V Murray <mark@grondar.org> To: Bruce Evans <brde@optusnet.com.au> Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org> Subject: Re: svn commit: r257535 - head/sys/netgraph Message-ID: <38F2745D-B252-495E-96D3-B4139165AB95@grondar.org> In-Reply-To: <20131103091238.S1004@besplex.bde.org> References: <201311020011.rA20BchL020170@svn.freebsd.org> <20131102151309.A1102@besplex.bde.org> <CAJ-VmokeP5Z2d7jZ-j-Thrh_VuQBKGpKC9nWG%2BQfhR0f6wzF9w@mail.gmail.com> <76BC3F76-ED5E-42F0-BCCE-271EA723698E@grondar.org> <0FD2B8FA-7DD7-4626-95F6-BB64B648E81A@grondar.org> <20131103091238.S1004@besplex.bde.org>
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--Apple-Mail=_4008F7B3-6AF9-4838-9C8C-F213184AB203 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 On 2 Nov 2013, at 22:28, Bruce Evans <brde@optusnet.com.au> wrote: > On Sat, 2 Nov 2013, Mark R V Murray wrote: >=20 >> On 2 Nov 2013, at 09:32, Mark R V Murray <mark@grondar.org> wrote: >>>> Mark - did you initially mean the address of the mbuf m_data = pointer, >>>> or the data payload itself? >>>=20 >>> As Bruce says - the address of payload data itself. We don=92t have = 12-byte pointers in FreeBSD. :-) >>=20 >> Cancel that. >>=20 >> The address passed must be the address of the m_data field in the = mbuf structure. The harvested data is 12 bytes from that address = forward, so not the data pointed to by that m_data pointer but the = pointer value itself and some following junk too. >=20 > Is that really worth using? Yes. Most of the value comes from the timing. The 12 bytes we snatch on = the way past are opportunistic, and hopefully cheap due to being = in-cache. M --=20 --=20 Mark R V Murray --Apple-Mail=_4008F7B3-6AF9-4838-9C8C-F213184AB203 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.22 (Darwin) Comment: GPGTools - http://gpgtools.org iQCVAwUBUnV+Vd58vKOKE6LNAQrciQP+PtQA6vKGhlaBYJ+6HdXWzwaXhEHn+/1l TQ8h6YGGFJ17BHjP9e2QoxYgp1zByXUF8C3DkdXezGj+TbnTjN4I+7udoV9jdKV0 64/4N1SpuVcwzks6h+OW1j5/7eC/Xy8vT59XreF6wplfZxU8ODbPFwFRXUgCBdvo AihilNgqooE= =KV+c -----END PGP SIGNATURE----- --Apple-Mail=_4008F7B3-6AF9-4838-9C8C-F213184AB203--
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