netdev - Re: Scaling 'ip addr add' (was Re: What's the right way to use a *large* number of source addresses?)

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Message-ID: <1401284699.5367.268.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 28 May 2014 06:44:59 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	sowmini varadhan <sowmini05@...il.com>
Cc:	Jamal Hadi Salim <jhs@...atatu.com>,
	Niels Möller <nisse@...thpole.se>,
	netdev <netdev@...r.kernel.org>, Jonas Bonn <jonas@...thpole.se>
Subject: Re: Scaling 'ip addr add' (was Re: What's the right way to use a
 *large* number of source addresses?)

On Wed, 2014-05-28 at 08:18 -0400, sowmini varadhan wrote:
> On Tue, May 27, 2014 at 9:41 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> 
> > Last time I checked, we were spending _lot_ of time in check_lifetime()
> 
> Although check_lifetime() itself did not light up in my
> perf output, i see your point- it has a few ifa_list walks
> that might end up being expensive - but these are static
> IPv4 addresses- they should be marked IFA_F_PERMANENT,
> right? That's probably why they did not show up in my perf output?


How did you run perf ?

If you run :

perf record ./your_script.sh

It wont catch all the load that is triggered from work queues.

If you do

./your_script.sh &

perf top

Then you'll see check_lifetime() at first position.


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