Maximum simultaneous interfaces ppp

Maximum simultaneous interfaces ppp

[Julio Rodanes - KNET]

Hi
How many interfaces ppp is possible create with ppp-2.4.2 and kernel
2.4.22 ? Is 100 interfaces ppp the max limit??

Thanks.

Re: Maximum simultaneous interfaces ppp

[Paul Mackerras]

Julio Rodanes - KNET writes:

> How many interfaces ppp is possible create with ppp-2.4.2 and kernel
> 2.4.22 ? Is 100 interfaces ppp the max limit??

There is no hard limit, you can create as many as you like within the
constraints of the amount of memory your machine has.

Paul.

Re: Maximum simultaneous interfaces ppp

[James Cameron]

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On Wed, Mar 22, 2006 at 01:50:00PM +1100, Paul Mackerras wrote:
> Julio Rodanes - KNET writes:
> > How many interfaces ppp is possible create with ppp-2.4.2 and kernel
> > 2.4.22 ? Is 100 interfaces ppp the max limit??
> 
> There is no hard limit, you can create as many as you like within the
> constraints of the amount of memory your machine has.

Are you sure about that, Paul?

2.4.22 net/core/dev.c has a limit of 100 on dev_alloc_name().
2.6.15 net/core/dev.c has a limit of 8*8*PAGE_SIZE.

-- 
James Cameron
http://ftp.hp.com.au/sigs/jc/

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Re: Maximum simultaneous interfaces ppp

[Paul Mackerras]

James Cameron writes:
> On Wed, Mar 22, 2006 at 01:50:00PM +1100, Paul Mackerras wrote:
> > Julio Rodanes - KNET writes:
> > > How many interfaces ppp is possible create with ppp-2.4.2 and kernel
> > > 2.4.22 ? Is 100 interfaces ppp the max limit??
> > 
> > There is no hard limit, you can create as many as you like within the
> > constraints of the amount of memory your machine has.
> 
> Are you sure about that, Paul?
> 
> 2.4.22 net/core/dev.c has a limit of 100 on dev_alloc_name().
> 2.6.15 net/core/dev.c has a limit of 8*8*PAGE_SIZE.

ppp_generic.c doesn't use dev_alloc_name, it uses its own allocator
for unit numbers.

Paul.

Re: Maximum simultaneous interfaces ppp

[James Cameron]

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On Wed, Mar 22, 2006 at 02:39:59PM +1100, Paul Mackerras wrote:
> ppp_generic.c doesn't use dev_alloc_name, it uses its own allocator
> for unit numbers.

Ah, I see, thanks.  Cardmap, neat.

This is great, I can get rid of some old urban legends in the PPTP
projects that claim that dev_alloc_name needs to be fixed.  People still
bring it up, so I'll begin denying the need.

I've certainly tested between 500 and 1000 interfaces on 2.6.15.

-- 
James Cameron
http://ftp.hp.com.au/sigs/jc/

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