From: Florian Westphal <fw@strlen.de>
To: David Miller <davem@davemloft.net>
Cc: hannes@stressinduktion.org, netdev@vger.kernel.org
Subject: Re: updates to syncookies - timestamps not needed any more (freebsd)
Date: Fri, 12 Jul 2013 10:41:45 +0200 [thread overview]
Message-ID: <20130712084145.GJ27468@breakpoint.cc> (raw)
In-Reply-To: <20130711.165726.2168148122875413191.davem@davemloft.net>
David Miller <davem@davemloft.net> 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.
The main difference to what linux does is to avoid encoding the 'count'
value (Linux doesn't reseed secret[], and relies on count to detect old
cookies).
Not having the counter frees up space to encode tcp options in the cookie
instead of the timestamp.
next prev parent reply other threads:[~2013-07-12 8:41 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
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 [this message]
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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