From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Emelyanov Subject: Re: [Devel] Re: network namespace ipv6 perfs Date: Mon, 03 Mar 2008 17:55:11 +0300 Message-ID: <47CC114F.8050104@openvz.org> References: <47CC0920.6000005@fr.ibm.com> <47CC0E3B.1040809@bull.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Daniel Lezcano , Linux Containers , Linux Netdev List , Denis Lunev To: Benjamin Thery Return-path: Received: from sacred.ru ([62.205.161.221]:59200 "EHLO sacred.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753788AbYCCO5S (ORCPT ); Mon, 3 Mar 2008 09:57:18 -0500 In-Reply-To: <47CC0E3B.1040809@bull.net> Sender: netdev-owner@vger.kernel.org List-ID: Benjamin Thery wrote: > Daniel Lezcano wrote: >> Hi, >> >> Some performance tests was made by Benjamin to watch out the impact = of=20 >> the network namespace. The good news is there is no impact when used= =20 >> with or without namespaces. That has been checked using a real netwo= rk=20 >> device inside a network namespace. >> >> These results are consistent with the ones previously made for ipv4. >> >> http://lxc.sourceforge.net/network/bench_ipv6_graph.php >> >> Thanks to Benjamin who did all the performance tests :) >=20 > In these results, may be, there is one thing that should be explained= =2E > It is the CPU utilization overhead in the 'veth' case. >=20 > Compared to physical devices or macvlan, veth interfaces don't benefi= t > from hardware offloading mechanisms: i.e. checksums have to be comput= ed > by the soft. That explains the big overhead in CPU utilization when You can tune the veth devices not to account checksum when unnecessary. > using this kind of virtual interface. >=20 > Benjamin >=20 >> Regards >> -- Daniel >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> Sauf indication contraire ci-dessus: >> Compagnie IBM France >> Si=E8ge Social : Tour Descartes, 2, avenue Gambetta, La D=E9fense 5,= 92400 >> Courbevoie >> RCS Nanterre 552 118 465 >> Forme Sociale : S.A.S. >> Capital Social : 542.737.118 ? >> SIREN/SIRET : 552 118 465 02430 >> >> >=20 >=20