netdev - Re: [iproute PATCH 0/2] Netns performance improvements

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Date:	Fri, 8 Jul 2016 10:31:45 -0400
From:	Brian Haley <brian.haley@....com>
To:	Rick Jones <rick.jones2@....com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Phil Sutter <phil@....cc>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Stephen Hemminger <shemming@...cade.com>,
	netdev@...r.kernel.org
Subject: Re: [iproute PATCH 0/2] Netns performance improvements

On 07/07/2016 01:28 PM, Rick Jones wrote:
> On 07/07/2016 09:34 AM, Eric W. Biederman wrote:
>> Rick Jones <rick.jones2@....com> writes:
>>> 300 routers is far from the upper limit/goal.  Back in HP Public
>>> Cloud, we were running as many as 700 routers per network node (*),
>>> and more than four network nodes. (back then it was just the one
>>> namespace per router and network). Mileage will of course vary based
>>> on the "oomph" of one's network node(s).
>>
>> To clarify processes for these routers and dhcp servers are created
>> with "ip netns exec"?
>
> I believe so, but it would be good to have someone else confirm that, and speak
> to your paragraph below.

Yes, the namespace is created and configured, then in the case of dhcp an 'ip 
netns exec $namespace dnsmasq ...' is run.  Routers typically have a small 
daemon running "inside" as well.

>> If that is the case and you are using this feature as effectively a
>> lightweight container and not lots vrfs in a single network stack
>> then I suspect much larger gains can be had by creating a variant
>> of ip netns exec avoids the mount propagation.

So you're thinking a new command like 'ip netns daemon $namespace ...' ?  Or if 
there's a better way with other tools today to accomplish this I'd be 
interested, as waiting for a new iproute2 to ripple through the distros could 
take a while.

-Brian