netdev - Re: [Patch net-next] tcp: add a global sysctl to control TCP delayed ack

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

Date:	Fri, 5 Apr 2013 00:48:10 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Cong Wang <amwang@...hat.com>
Cc:	netdev@...r.kernel.org, Eric Dumazet <eric.dumazet@...il.com>,
	Rick Jones <rick.jones2@...com>,
	Stephen Hemminger <shemminger@...tta.com>,
	"David S. Miller" <davem@...emloft.net>,
	Thomas Graf <tgraf@...g.ch>,
	David Laight <David.Laight@...LAB.COM>
Subject: Re: [Patch net-next] tcp: add a global sysctl to control TCP delayed ack

On Thu, Apr 04, 2013 at 06:16:00PM +0800, Cong Wang wrote:
> From: Cong Wang <amwang@...hat.com>
> 
> Change from RFC:
> * make the sysctl per netns
> 
> According to previous discussion, it seems there is no
> reasonable heuristics.
> 
> Similar to TCP_QUICK_ACK option, but for people who can't
> modify the source code and still wants to control
> TCP delayed ACK behavior.
> 
> David, do you still have any objection?

I totally understand the objections that were given regarding this
patch. But for defense of this patch we also provide a knob to disable
slow start after idle, which from my point of view is as "evil" as
this change.

Btw I think we should make tcp_slow_start_after_idle namespace aware, too.

--
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