Re: Testing interface removal speedup patches from Eric Dumazet.

Ben,

--On 9 May 2011 12:42:39 -0700 Ben Greear [off-list ref] 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;