From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ivan Vladimirov <administrator@netwlan.net>
Date: Mon, 26 Feb 2007 10:39:33 +0000
Subject: Re: [LARTC] Ethernet bridge overflow ?
Message-Id: <45E2B8E5.5070503@netwlan.net>
List-Id: <lartc.vger.kernel.org>
References: <45DF107C.8080403@wanadoo.fr>
In-Reply-To: <45DF107C.8080403@wanadoo.fr>
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To: lartc@vger.kernel.org

S=E9bastien CRAMATTE wrote:
> Hello,
>
> I've setuped  an ethernet bridge on a debian sarge 3.1 with  l7-filter +
> ipp2 shapper rules
> The server is a supermicro p4sci + celeron pentium 4 base 3ghz  + 512Mb
> + 2 ethernet e1000
>
> One interface is connected to a cisco catalyst switch
> The other interface is connected directly to a CMTS (a sort of router
> for cable modem) configured as bridge too.
>
> More than 20Mbps of bandwith cross this bridge. Most of this traffic is
> p2p (~80%)
> When traffic goes over 14Mbps the  bridge seems to saturate (overflow ?
> ) and start to make colision and loose packets
>
> I've take a look to this  paper
> http://facweb.cti.depaul.edu/jyu/Publications/Yu-Linux-TSM2004.pdf
>
> And with a duron 1,3Ghz+512 mbps he obtain these values
>
> Input Rate   28,444,444
> (bps)
> Latency    29
> (us)
> Throughput 28,000,000
> (bps)
> Linux CPU 77%
> Occupancy
>
> A duron 1,3 is less powered than a celeron p4 3 ...  So I don't
> understand why I've got this problem :(
>
>
> When I make a  "top" or "uptime" all seems that works well ...
> I've got rrdtool graphs that check cpu and load and seems normal too ...
>
> Does someone  have got somes ideas ?
> Any clue or tips to isolate/resolve the problem are welcome
>
>
> Regards
>
> _______________________________________________
> LARTC mailing list
> LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
>
>
>  =20
The problem you have is caused by L7-filter
There is a performance problem with this filter .

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