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Date:	Tue, 05 Jun 2007 23:12:23 +0200
From:	Patrick McHardy <>
To:	Ben Greear <>
Subject: Re: [RFC VLAN 00/10]: VLAN netlink support try 2

Ben Greear wrote:
> Patrick McHardy wrote:
>> Ben Greear wrote:
>>> Patrick McHardy wrote:
>>>> The last VLAN patchset was outdated, sorry about the mixup. These
>>>> are the
>>>> correct patches. The iproute patch I posted was correct, so no
>>>> repost of
>>>> that one.
>>> Is there any significant performance penalty in creating VLANs using
>>> these patches?
>>> If you have a test station handy, could you let us know what 'time'
>>> shows for a script
>>> creating 4000 VLANs with the old vconfig/ioctl method v/s this new
>>> method?
>> Not significantly more, for 1000 VLANs I get:
>> ip link add:
>> real    0m22.836s
>> user    0m0.100s
>> sys     0m5.850s
>> vconfig add:
>> real    0m19.739s
>> user    0m0.090s
>> sys     0m3.600s
> Thanks for doing the tests.  That small performance drop seems
> fine to me.

I'll try to speed it up a bit more, my initial version needed something
like 10s for 1000 VLANs. I suspect the iproute RTM_NEWLINK probing done
for every (non-batched) operation adds quite significantly to the

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