netdev - Re: Performance issue : GRE tunneling

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Date:	Fri, 18 Jan 2008 18:08:03 +0300
From:	Badalian Vyacheslav <slavon@...telecom.ru>
To:	Jeba Anandhan <jeba.anandhan@...oni.com>
CC:	netdev@...r.kernel.org, matthew.hattersley@...oni.com
Subject: Re: Performance issue : GRE tunneling

Jeba Anandhan пишет:
> Hi All,
> When i send the traffic outside of GRE tunnel, The speed is in 3-4Mbps.
> When i use the tunnel for traffic, the speed get reduced huge. It is
> around 100-300Kbps. What are the factors affects the performance when we
> use tunneling [ ex:GRE tunneling ]?
>   
Hello. You may try get slow place. Get pc without CPU load (console mode 
and etc).
Try compile gre support in kernel. Turn on OPROFILE support.
Install oprofile utils.
do
opcontrol --vmlinux=/usr/src/linux/vmlinux
opcontrol -s
#do connect and try do traffic.
opreport -l | vi -
# you see that functions in kernel use cpu...
opcontrol -h #to stop

Maybe its help for you. Thanks!
> Thanks
> Jeba
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>   

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