From owner-freebsd-atm  Thu Apr 18  9:43:14 2002
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Date: Thu, 18 Apr 2002 09:42:20 -0700 (PDT)
From: Richard Hodges <rh@matriplex.com>
To: Harti Brandt <brandt@fokus.gmd.de>
Cc: Christophe Prevotaux <c.prevotaux@hexanet.fr>, atm@FreeBSD.ORG
Subject: Re: ATM Rate Limiting on PVC
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On Thu, 18 Apr 2002, Harti Brandt wrote:

> On Thu, 18 Apr 2002, Christophe Prevotaux wrote:
> 
> CP>Hi,
> CP>
> CP>there seems to be no capabilities in the ATM on FreeBSD
> CP>for rate limiting PVCs inbound and outbound , that would be nice
> CP>to have too. :)

HARP passes the connection parameters down to the driver.  My IDT driver
uses these on VC open to set the VC CBR or VBR parameters, for example.

It is also possible to install sysctl variables into a driver and use them
to set the VC parameters.  This is far from elegant, but might be useful
if the program creating the VC does not set the traffic parameters.

Of course, it is good to have hardware that supports cell rate control.
 
> Yes, but the PCA200E does not support rate limiting (i.e. traffic
> shaping). (Well, it supports it, but only for one PVC). Inbound rate
> limiting is not supported on any card I know of - this is a function of
> the network, not the end system.

Right.  The cells arrive, or they do not.  Usually, one wants to keep
every good PDU that arrives :-)

All the best,

-Richard


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