From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?utf-8?q?R=C3=A9mi_Denis-Courmont?= Subject: Re: IPv6 tunnel scalability problem Date: Mon, 1 Sep 2008 18:09:26 +0300 Message-ID: <200809011809.26410.rdenis@simphalempin.com> References: <200808311958.51510.rdenis@simphalempin.com> <8763pgxead.fsf@basil.nowhere.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: netdev@vger.kernel.org, Bernhard Schmidt To: Andi Kleen Return-path: Received: from yop.chewa.net ([91.121.105.214]:43886 "EHLO yop.chewa.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751305AbYIAPJ3 convert rfc822-to-8bit (ORCPT ); Mon, 1 Sep 2008 11:09:29 -0400 In-Reply-To: <8763pgxead.fsf@basil.nowhere.org> Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: Le lundi 1 septembre 2008 15:04:58 Andi Kleen, vous avez =C3=A9crit=C2=A0= : > R=C3=A9mi Denis-Courmont writes: > > I have been maintaining a TUN-based Linux implementation of > > Teredo/RFC4380. On a busy node, this can trigger quite many peers o= n the > > virtual point-to-point tunnel interface. I have received complaints= that > > the whole thing seems to hit some severe performance bottleneck whe= n 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 ou= tput Understood. But this far, the kernel crashes during my stress test... --=20 R=C3=A9mi Denis-Courmont http://www.remlab.net/