Re: [VLAN] Re: Should VLANs be devices or something else?

[Ben Greear <greearb@candelatech.com>]

Marcell Gal wrote:
> 

> I remember
> /proc/sys/net/ipv4/conf/
> was broken for about >300 devices. I do not know how's it today.

My VLAN code creates an entry for every vlan in /proc/net/vlan/
too, and it seems to quit creating entries after about 250 or so.
It's read-only info, so it doesn't seem to do too much harm.

I think there must be an 8-bit limit somewhere in the proc-fs.

> > Adding the hashed lookup for devices took the exponential curve out of
> > ip and ifconfig's performance, btw.
> 
> n^2 for creating n devices (in the unfortunate increasing or random
> order),
> (not 2^n), I guess.

It definately isn't fast, but then again, it is fast enough when you
only have 500 or so interfaces.  For the wierdos that want more, we
can just wait a little longer... :)

I'll offer the hashed-device-lookup
patch separately on my web site so it can be used if needed...

Ben

-- 
Ben Greear <greearb@candelatech.com>          <Ben_Greear@excite.com>
President of Candela Technologies Inc      http://www.candelatech.com
ScryMUD:  http://scry.wanfear.com     http://scry.wanfear.com/~greear