netdev - Re: [PATCH net-next 1/1] tcp: Prevent needless syn-ack rexmt during TWHS

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <1351229529.6537.284.camel@edumazet-glaptop>
Date:	Fri, 26 Oct 2012 07:32:09 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Vijay Subramanian <subramanian.vijay@...il.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	Venkat Venkatsubra <venkat.x.venkatsubra@...cle.com>,
	Elliot Hughes <enh@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next 1/1] tcp: Prevent needless syn-ack rexmt
 during TWHS

On Fri, 2012-10-26 at 07:06 +0200, Eric Dumazet wrote:

> About earlier patch, this would break :
> 
> tcp_abort_on_overflow - BOOLEAN
...
> And even if tcp_abort_on_overflow is TRUE, earlier patch would break
> some ability to have a momentary burst of SYN packets above the listen()
> backlog.

So instead of sending SYNACK immediately, we could try to defer it a
bit.

But before adding yet another trick, we should evaluate if this is
really needed.

The timer wheel we currently use on the listener socket limits us
because of the granularity of the timer (one single timer for all
requests)



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html