linux-kernel - Re: 2.6.19-rc1: Volanomark slowdown

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]

Message-Id: <1163001318.3138.346.camel@laptopd505.fenrus.org>
Date:	Wed, 08 Nov 2006 16:55:18 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	tim.c.chen@...ux.intel.com
Cc:	linux-kernel@...r.kernel.org, davem@...set.davemloft.net,
	kuznet@....inr.ac.ru, netdev@...r.kernel.org
Subject: Re: 2.6.19-rc1: Volanomark slowdown

On Tue, 2006-11-07 at 10:32 -0800, Tim Chen wrote:
> The patch
> 
> [TCP]: Send ACKs each 2nd received segment
> commit: 1ef9696c909060ccdae3ade245ca88692b49285b
> http://kernel.org/git/?
> p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1ef9696c909060ccdae3ade245ca88692b49285b
> 
> reduced Volanomark benchmark throughput by 10%.  
> This is because Volanomark sends 
> short message (<100 bytes) on its TCP
> connections.  This patch increases the number of ACKs 
> traffic by 3.5 times.  
> 
> By adopting this patch, we assume that with
> small segment, having short delay is important 
> enough that we are willing to reduce bandwidth 
> with more ACKs.  

I wonder if it's an option to use low priority QoS fields for these acks
(heck I don't even know if ACKs have such fields in their packet) so
that they can get dropped if there are more packets then there is
bandwidth ....


-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/