netdev - Re: Scalability of interface creation and deletion

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Message-ID: <1304793890.3207.28.camel@edumazet-laptop>
Date:	Sat, 07 May 2011 20:44:50 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alex Bligh <alex@...x.org.uk>
Cc:	netdev@...r.kernel.org
Subject: Re: Scalability of interface creation and deletion

Le samedi 07 mai 2011 à 19:38 +0100, Alex Bligh a écrit :
> 
> --On 7 May 2011 18:26:29 +0200 Eric Dumazet <eric.dumazet@...il.com> wrote:
> 
> ># time rmmod dummy
> >
> > real	0m0.111s
> > user	0m0.000s
> > sys	0m0.000s
> >
> >
> > This removed my two dummy0/dummy1 devices.
> 
> rmmod dummy even with numdummies=100 does only one synchronize_net() and
> is quick (0.8ms).
> 

Yes, thanks to batching we added some time ago to speedup module unload.

And because you didnt setup IP addresses on them ;)

for i in `seq 0 99`
do
ifconfig dummy$i 192.168.$i.1 up
done



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