netdev - Re: IPv6 tunnel scalability problem

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Message-ID: <8763pgxead.fsf@basil.nowhere.org>
Date:	Mon, 01 Sep 2008 14:04:58 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Rémi Denis-Courmont <rdenis@...phalempin.com>
Cc:	netdev@...r.kernel.org, Bernhard Schmidt <berni+ipv6@...kenwald.de>
Subject: Re: IPv6 tunnel scalability problem

Rémi Denis-Courmont <rdenis@...phalempin.com> writes:

> I have been maintaining a TUN-based Linux implementation of Teredo/RFC4380. On 
> a busy node, this can trigger quite many peers on the virtual point-to-point 
> tunnel interface. I have received complaints that the whole thing seems to 
> hit some severe performance bottleneck when this happens. It is not clear to 
> me at this point whether it's a kernel or a user problem. So I have been 
> writing a stress test.

You could use oprofile to find out where the CPU time is going.
That would work even during normal operation. Post the opreport -l output

-Andi

-- 
ak@...ux.intel.com
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