Re: [PATCH] support for large number of network devices.

[Stephen Hemminger <shemminger@osdl.org>]

On Tue, 13 Jan 2004 15:59:21 -0800
"David S. Miller" <davem@redhat.com> wrote:

> On Tue, 13 Jan 2004 15:46:10 -0800
> Stephen Hemminger <shemminger@osdl.org> wrote:
> 
> > When using pseudo network devices, and really big machines; there is
> > sometimes a need to have a lot of network devices.  This replaces the
> > existing 2.6.1 limit of 100 entries an was O(n^2)
> > with a algorithm that will handle up to 32768 entries with O(n) behaviour.
> > 
> > Does need a temporary page, but that shouldn't be a big deal.
> > It has the same semantics, it will find the first empty name and use it.
> 
> I think your code has different semantics than exist currently.
> 
> For example, let's use the example of asking for "slip%d" then "eth%d".
> The existing code would hand out "slip0" then "eth0", but your code would
> deliver "slip0" then "eth1" which is not correct.
> 
> Or did I miss something clever in your algorithm?

	It uses the output format string for the sscanf match, and since
	sscanf formats have to match. 	sscanf("eth0", "slip%d", &i) returns 0
	so eth0 would be skipped