about the Tulip & Intel PRO 1000

[Robert Morris]

Pramod,

Try Znyx Networks, http://www.znyx.com/. The ZX340Q and ZX372 have
Tulip (21143) chips and comes in a four-port version. I am pretty sure
the ZX340Q works with Click, but I have never tried the ZX372.

Robert

> From: "Pramod John" <pramod_nic at hotmail.com>
> To: "Robert Morris" <rtm at amsterdam.lcs.mit.edu>
> Cc: <click at amsterdam.lcs.mit.edu>
> Subject: Re: about the Tulip & Intel PRO 1000
> Date: Mon, 14 Apr 2003 09:39:36 -0700
> 
> Robert,
> 
>     What Tulip based cards do you know of that are readily available ? Any
> multiport cards ?
> 
> thx,
> 
> Pramod
> 
> ----- Original Message -----
> From: "Robert Morris" <rtm at amsterdam.lcs.mit.edu>
> To: "Giorgio Calarco" <gcalarco at deis.unibo.it>
> Cc: <click at amsterdam.lcs.mit.edu>
> Sent: Monday, April 14, 2003 3:30 AM
> Subject: Re: about the Tulip & Intel PRO 1000
> 
> 
> > Giorgio,
> >
> > Yes, by DMA we mean direct memory access. The Tulip does transfer
> > packets to/from memory without direct CPU intervention.
> >
> > The Intel Pro 1000 also uses DMA, and is generally similar to the
> > Tulip. However, the CPU must use one PIO instruction per batch of
> > packets to notify the Pro 1000 that there is new work for it to do.
> >
> > Robert
> >
> > > From: "Giorgio Calarco" <gcalarco at deis.unibo.it>
> > > To: <click at amsterdam.lcs.mit.edu>
> > > Subject: about the Tulip & Intel PRO 1000
> > > Date: Mon, 14 Apr 2003 11:52:09 +0200
> > > Organization: DEIS
> > >
> > > Hi,
> > >
> > > I 'm reading your paper "programming language optimizations
> > > for modular router configurations" and there are some details
> > > which I cannot understand, probably due to my poor knowledge
> > > of how the hardware platform works...
> > > I try to explain what I think I have understood, plese correct
> > > me if I mistake... I refer to paragraph 8.4 - PCI limitations.
> > >
> > > You wrote that packets can be dropped on the receving
> > > tulip card because the internal buffer is full or because the NIC
> > > is not able to fetch a ready DMA descriptor etc etc.
> > > My first question is: with DMA you mean the "direct memory access" ?
> > > If so, are you transferring the packets from the NIC to memory
> > > making the tulip card to be the PCI bus master and
> > > programming it to transfer the packets without
> > > involving the CPU ? If not, how the transferral works ?
> > >
> > > If what I've thought is true, I have a second question...
> > > about the Intel PRO 1000.
> > > I'm reading that this can be slower than the tulip card because the
> > > packets are transferred via PIO. Is there a reason for this ?
> > > I mean, the Intel PRO1000 is unable to become the PCI
> > > bus master and the only way to move the packets around
> > > needs the CPU to be involved (being it the bus master)?
> > > Or is this choice due to other reasons ?
> > >
> > >
> > > Thanks in advance for your answers
> > >
> > > giorgio
> > >
> > >
> > >
> > >
> > > Ing. Giorgio Calarco
> > > DEIS - Università di Bologna
> > > Viale Risorgimento, 2 40136 Bologna - Italy
> > > Tel: 051 2093776 Fax: 051 2093053
> > > E-mail: gcalarco at deis.unibo.it
> > > PGP: http://www.deis.unibo.it/GCalarco/Giorgio_Calarco.asc
> > >
> > >
> >