Date: Tue, 5 May 2015 14:46:14 +0000 (UTC) From: Barney Cordoba <barney_cordoba@yahoo.com> To: Jim Thompson <jim@netgate.com>, Julian Elischer <julian@freebsd.org> Cc: Luigi Rizzo <rizzo@iet.unipi.it>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: netmap-ipfw on em0 em1 Message-ID: <1441324756.337558.1430837174176.JavaMail.yahoo@mail.yahoo.com> In-Reply-To: <8612DCBA-43BB-498D-97EA-31F3E25F93C8@netgate.com> References: <8612DCBA-43BB-498D-97EA-31F3E25F93C8@netgate.com>
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Are you NOT SHARP ENOUGH to understand that my proposal DOESN'T USE THE NET=
WORK STACK? OMFG
Julien, perhaps if people weren't so hostile towards commercial companies p=
roviding ideas for alternative ways of doing things you'd get more input an=
d more help. Why would I want to help these people?
BC=20
On Monday, May 4, 2015 11:55 PM, Jim Thompson <jim@netgate.com> wrote:
=20
=20
> On May 4, 2015, at 10:07 PM, Julian Elischer <julian@freebsd.org> wrote:
>=20
> Jim, and Barney. I hate to sound like a broken record, but we really need=
interested people in the network stack.
> The people who make the decisions about this are the people who stand up =
and say "I have a=C2=A0 few hours I can spend on this".
> If you were to do so too, then really, all these issues could be worked o=
n. get in there and help rather than standing on the bleachers and offering=
advise.
>=20
> There is no person working against you here.
>=20
> From my counting the current active networking crew is about 10 people. w=
ith another 10 doing drivers.
> You would have a lot of sway in a group that small. but you have th be in=
it first, and the way to do that is to simple start doing stuff.=C2=A0 no-=
one was ever sent an invitation. They just turned up.
I am (and we are) interested.=C2=A0 I=E2=80=99m a bit short on time, and I =
have a project/product (pfSense) to maintain, so I keep other people busy o=
n the stack.
Examples include:
We co-sponsored the AES-GCM work.=C2=A0 Unfortunately, the process stopped =
before the IPsec work to leverage this we did made it upstream.
As partial remedy, gnn is currently evaluating all the patches from pfSense=
for inclusion into the FreeBSD mainline.
I was involved in the work to replace the hash function used in pf.=C2=A0 T=
his is (only) min 3% gain, more if you carry large state tables.
There was a paper presented at AsiaBSDcon, so at least we have a methodolog=
y to speak about performance increases.=C2=A0 (Is the methodology in the pa=
per perfect?=C2=A0 No.=C2=A0 But at least it=E2=80=99s a stake in the groun=
d.)
We=E2=80=99re currently working with Intel to bring support for QuickAssist=
to FreeBSD.=C2=A0 (Linux has it.)=C2=A0 While that=E2=80=99s not =E2=80=98=
networking=E2=80=99 per-se, the larger consumers for the technology
are various components in the stack.
The other flaws I pointed out are on the list of things for us to work on /=
fix.=C2=A0 Someone might get there first, but =E2=80=A6 that=E2=80=99s goo=
d.=C2=A0 I only care about getting things fixed.
Jim
p.s.=C2=A0 yes, I'm working on a commit bit.
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Message-ID: <5548EC8F.3010103@freebsd.org>
Date: Tue, 05 May 2015 18:15:11 +0200
From: Julien Charbon <jch@freebsd.org>
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To: freebsd-net@freebsd.org
Subject: MFC-ing TCP timer race condition fix
References: <5548BB20.2020700@freebsd.org>
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(Same exact email but with a meaningful topic this time...)
Hi list,
I was asked if it is possible to MFC r281599 in FreeBSD 10:
---
Fix an old and well-documented use-after-free race condition in
TCP timers:
- Add a reference from tcpcb to its inpcb
- Defer tcpcb deletion until TCP timers have finished
---
https://svnweb.freebsd.org/base?view=3Drevision&revision=3D281599
First, I thought it was no possible as it touches struct
tcp_timer/struct tcpcb_mem. Second, John pointed me that these two
structures are used only internally. The only side effect I was able to
find is the increase of struct tcpcb_mem size:
- stable/10: struct tcpcb_mem size is 1024 bytes
- stable/10 + tcp timer change: struct tcpcb_mem size is 1032 bytes
- currently in head: struct tcpcb_mem size is 1048 bytes
If you have extra concerns on MFC-ing this change please scream.
Without nice yelps I plan to "MFC after: 1 month" (around May 16th).
Thanks.
--
Julien
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