[ofw] udapl for windows

[Hal Rosenstock]

On Tue, 2007-12-11 at 09:35 -0800, Fab Tillier wrote:
> The SendArp function sends an ARP request every time it is invoked.  
> It doesn't actually lookup the system's ARP cache.  Using SendArp was tried with WSD 
> and found to give significantly worse connection establishment rates (~50%) than doing 
> the ATS query to the SA, which is why WSD still uses ATS.  I suppose the ATS query rate 
> depends on the SM.

Yes, on SA component (of SM). ATS is a SubAdmGet of ServiceRecord so it
is the SA transaction rate (specifically for SR lookups of which there
aren't that many).

-- Hal

> -Fab
> 
> -----Original Message-----
> From: ofw-bounces at lists.openfabrics.org [mailto:ofw-bounces at lists.openfabrics.org] On Behalf Of Tzachi Dar
> Sent: Monday, December 10, 2007 1:06 PM
> To: Sean Hefty; Davis, Arlin R; Gabor Forgacs; ofw at lists.openfabrics.org
> Subject: RE: [ofw] udapl for windows
> 
> Is there any reason why the windows implementation will not use Arp for
> the
> IP -> GID mapping?
> 
> This code looks trivial.
> 
> Thanks
> Tzachi
> 
> > -----Original Message-----
> > From: ofw-bounces at lists.openfabrics.org
> > [mailto:ofw-bounces at lists.openfabrics.org] On Behalf Of Sean Hefty
> > Sent: Monday, December 10, 2007 8:48 PM
> > To: Davis, Arlin R; 'Gabor Forgacs'; ofw at lists.openfabrics.org
> > Subject: RE: [ofw] udapl for windows
> >
> > >Well, without rdma_cm in WinOF I have few options. Does
> > someone wish to
> > >commit to rdma_cm in WinOF by next release? Are you volunteering?
> >
> > This is a question of how much proprietary protocol uDAPL
> > needs to define.
> >
> > The RDMA CM provides IP -> GID mapping, path record lookup,
> > and connection establishment.  There's not a strict
> > requirement on how the IP -> GID mapping is obtained.  Linux
> > uses ARP, but Windows could config files, ATS, or exchange
> > that data using a service running over sockets.  (I've been
> > thinking about the latter as a solution to working across IB
> > routers.)  uDAPL could use the same PR lookup and IB CM
> > mechanisms that it uses today.  The only requirement is that
> > the private data and SID should match a specific format.
> 
> 
> 
> > I don't know if the Windows IB CM allows matching connections
> > based on private data content or operates only on the SID, so
> > there may be different restrictions between Linux and Windows
> > trying to simulate listening on specific IP addresses.
> >
> > - Sean
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> >
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