From: Hannes Frederic Sowa <hannes@stressinduktion.org>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Subject: Re: updates to syncookies - timestamps not needed any more (freebsd)
Date: Fri, 12 Jul 2013 03:41:38 +0200 [thread overview]
Message-ID: <20130712014138.GD12611@order.stressinduktion.org> (raw)
In-Reply-To: <20130711.165726.2168148122875413191.davem@davemloft.net>
On Thu, Jul 11, 2013 at 04:57:26PM -0700, David Miller wrote:
> From: Hannes Frederic Sowa <hannes@stressinduktion.org>
> Date: Mon, 8 Jul 2013 18:04:21 +0200
>
> > Interesting patch by Andre Opperann of FreeBSD:
> > <http://lists.freebsd.org/pipermail/freebsd-net/2013-July/035999.html>
>
> Interesting work, but outside of the change of hash function I'm not so
> sure. The whole reason we went to the timestamp field was to eliminate
> the coarse tables.
>
> I understand that he claims that %99.99 of connections are handled by
> the values he has chosen, but this is still a step backwards in my
> opinion.
If I understood this thread[0] correctly, it seems Windows 8 might not
enable TCP timestamps by default? I can not verify, I currently have
no Windows installations near me. That would mean, linux does, too,
fall back to an unscaled window connection as soon as syncookies kick in
(but we would not end up with an unsynchronized window scale option).
[0] http://thread.gmane.org/gmane.os.freebsd.devel.net/38211/focus=38216
Greetings,
Hannes
next prev parent reply other threads:[~2013-07-12 1:41 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-08 16:04 updates to syncookies - timestamps not needed any more (freebsd) Hannes Frederic Sowa
2013-07-08 16:39 ` Eric Dumazet
2013-07-08 18:09 ` Hannes Frederic Sowa
2013-07-11 23:57 ` David Miller
2013-07-12 1:41 ` Hannes Frederic Sowa [this message]
2013-07-12 2:25 ` Eric Dumazet
2013-07-12 6:59 ` richard -rw- weinberger
2013-07-12 15:22 ` Rick Jones
2013-07-12 16:18 ` Eric Dumazet
2013-07-12 16:33 ` Rick Jones
2013-07-12 17:00 ` Eric Dumazet
2013-07-12 7:24 ` David Miller
2013-07-12 8:41 ` Florian Westphal
2013-07-12 14:04 ` Eric Dumazet
2013-07-12 14:25 ` Florian Westphal
2013-07-12 14:32 ` Eric Dumazet
2013-07-12 23:37 ` David Miller
2013-07-26 6:45 ` Hannes Frederic Sowa
2013-07-26 12:56 ` Eric Dumazet
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