Date: Tue, 15 Dec 1998 09:52:05 +0100 (MET) From: hm@hcs.de (Hellmuth Michaelis) To: tlambert@primenet.com (Terry Lambert) Cc: current@FreeBSD.ORG, isdn@FreeBSD.ORG Subject: Re: if_sppp is BROKEN!!! Message-ID: <m0zpqD8-0000f8C@hcswork.hcs.de> In-Reply-To: <199812150826.BAA16811@usr06.primenet.com> from Terry Lambert at "Dec 15, 98 08:26:39 am"
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>From the keyboard of Terry Lambert: (Cc: stripped) > Ideally, you would want an operation to propagate the full stack, > up or down, as a result of one operation. Can you please explain why one operation wants to propagate the full stack ? Background: In the current i4b ISDN implementation exactly this happens, i.e. a layer 1 IRQ triggers an action in layer 2 triggering an action in layer 3 which triggers an action (going down now) in layer 2 triggering an action in layer 1 again. The problem of this going up and down at IRQ time is not only the time lasting, but i.e. layer 2 being in a state transition which is not fully finished when the reply from layer 3 going down enters layer 2 again (being still in the middle of the previous up-going state transition). Until now i was under the impression that only a decoupling of the layers would make the transitions in one layer an atomic operation to avoid the above described scenario. hellmuth -- Hellmuth Michaelis Tel +49 40 559747-70 HCS Hanseatischer Computerservice GmbH Fax +49 40 559747-77 Oldesloer Strasse 97-99 Mail hm [at] hcs.de 22457 Hamburg WWW http://www.hcs.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message
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