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Date: Mon, 03 Mar 2008 17:55:11 +0300 From: Pavel Emelyanov <xemul@...nvz.org> To: Benjamin Thery <benjamin.thery@...l.net> CC: Daniel Lezcano <dlezcano@...ibm.com>, Linux Containers <containers@...ts.osdl.org>, Linux Netdev List <netdev@...r.kernel.org>, Denis Lunev <den@...nvz.org> Subject: Re: [Devel] Re: network namespace ipv6 perfs Benjamin Thery wrote: > Daniel Lezcano wrote: >> Hi, >> >> Some performance tests was made by Benjamin to watch out the impact of >> the network namespace. The good news is there is no impact when used >> with or without namespaces. That has been checked using a real network >> 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 :) > > In these results, may be, there is one thing that should be explained. > It is the CPU utilization overhead in the 'veth' case. > > Compared to physical devices or macvlan, veth interfaces don't benefit > from hardware offloading mechanisms: i.e. checksums have to be computed > 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. > > Benjamin > >> Regards >> -- Daniel >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> Sauf indication contraire ci-dessus: >> Compagnie IBM France >> Siège Social : Tour Descartes, 2, avenue Gambetta, La Défense 5, 92400 >> Courbevoie >> RCS Nanterre 552 118 465 >> Forme Sociale : S.A.S. >> Capital Social : 542.737.118 ? >> SIREN/SIRET : 552 118 465 02430 >> >> > > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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