From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Bligh <alex@alex.org.uk>
Subject: Re: Testing interface removal speedup patches from Eric Dumazet.
Date: Mon, 09 May 2011 21:24:18 +0100
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Cc: netdev <netdev@vger.kernel.org>,
	Eric Dumazet <eric.dumazet@gmail.com>,
	Alex Bligh <alex@alex.org.uk>
To: Ben Greear <greearb@candelatech.com>
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Ben,

--On 9 May 2011 12:42:39 -0700 Ben Greear <greearb@candelatech.com> wrote:

> I use HZ of 1000, btw.
>
> I killed udev, haldaemon..seemed to be just my stuff running.
>
> I don't see any 'ifup' running with these things dead...
>
> If you want to post your script, I can run it on my
> machine...

See below - run (on ubuntu) by
  service udev stop
  unshare -n bash
  ./ifseq -n 500

The unshare seems sufficient to stop any remaining udev listeners getting
wind of interface creation/deletion.

-- 
Alex Bligh


#!/bin/bash

# Usage:
#   ifaceseq [options]
#
# Options:
#   -n NUM : use NUM interfaces
#   -t TYPE : use TYPE of interfaces (supported: veth, vlan)

numifs=10
itype=veth

while getopts n:t: flag; do
    case ${flag} in
	n) numifs=${OPTARG} ;;
	t) itype=${OPTARG} ;;
    esac
done

shift $((OPTIND-1))

createifs ()
{
    echo `date` creating $numifs interfaces
    case ${itype} in
	vlan)
	    for i in `seq 1 $numifs` ; do
		ip link add link eth0 name vlan${i} type vlan id ${i}
	    done
	    ;;
	*)
	    for i in `seq 1 $numifs` ; do
		ip link add testa${i} type veth peer name testb${i}
	    done
    esac
    echo `date` done
}

deleteifs ()
{
    echo `date` deleting $numifs interfaces
    case ${itype} in
	vlan)
	    for i in `seq 1 $numifs` ; do
		ip link delete dev vlan${i}
	    done
	    ;;
	*)
	    for i in `seq 1 $numifs` ; do
		ip link delete testa${i}
	    done
    esac
    echo `date` done
}

time createifs;
time deleteifs;