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Date: Mon, 3 Mar 2008 16:04:47 +0100 From: "Benjamin Thery" <ben.thery@...il.com> To: "Pavel Emelyanov" <xemul@...nvz.org> Cc: "Benjamin Thery" <benjamin.thery@...l.net>, "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 On Mon, Mar 3, 2008 at 3:55 PM, Pavel Emelyanov <xemul@...nvz.org> wrote: > 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. Oh. This is interesting. You mean with ethtool -K rx/tx? I will give it a try. Benjamin > > > > using this kind of virtual interface. > > > > Benjamin > > > >> Regards > >> -- Daniel > >> >-- > 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 > -- 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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