Subject: Re: [Devel] Re: network namespace ipv6 perfs

From: Pavel Emelyanov <[email-masked]>
Date: Mon, 03 Mar 2008 17:55:11 +0300

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
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> 
>