Re: [ofa-general] InfiniBand/iWARP/RDMA merge plans for 2.6.26 (what'sininfiniband.git)

[Richard Frank]

OK - and the conversation was about using NetPerf to compare performance 
of RDS to UDP relative to suitability for Oracle use ... so I think 
those statements still illustrate my points...

1) NetPerf does not do what Oracle does - and hence is not useful from 
Oracle's perspective in comparing ULPs.
2) For some metrics - it's not valid to compare a non-reliable IPC to a 
reliable IPC -  it's not an apples to apples comparison. Especially when 
the app is considered and what the app must do to use UDP vs RDS.

I did not say that NetPerf should not be extended to support RDS - just 
that using it to do a comparison of ULPs to determine how well Oracle 
would run - is not what we (Oracle) would want - at least that was my 
intention..

Scott Weitzenkamp (sweitzen) wrote:
> Rich,
>
> On Nov 1, 2007, you wrote this to rds-devel:
>
>   "Netperf is too simplistic in that all it seems to do is stream data
> in a 
>   simple loop. This is not how Oracle uses the IPC and again does not 
>   reflect what it would take to make UDP reliable.
>
>   For this reason we are not interested in having Netperf support RDS
> and 
>   or seeing Netperf data."
>
> I would like to see RDS supported by existing common tools like netperf,
> iperf, etc. so we can easily compare how RDS performs to UDP for IPC
> models other than Oracle.
>
> Scott Weitzenkamp
> SQA and Release Manager
> Data Center Access Engineering
> Cisco Systems
>
>
>  
>
>   
> > -----Original Message-----
> > From: Richard Frank [mailto:richard.frank@xxxxxxxxxx] 
> > Sent: Wednesday, April 02, 2008 10:38 AM
> > To: Scott Weitzenkamp (sweitzen)
> > Cc: Roland Dreier (rdreier); rds-devel@xxxxxxxxxxxxxx; 
> > linux-kernel@xxxxxxxxxxxxxxx; general@xxxxxxxxxxxxxxxxxxxxx
> > Subject: Re: [ofa-general] InfiniBand/iWARP/RDMA merge plans 
> > for 2.6.26 (what'sin infiniband.git)
> >
> > I believe there is a patch for NetPerf which supports RDS - 
> > although it 
> > may need to be updated - and submitted.
> >
> > The only prior discussion I can think of - was whether or not NetPerf 
> > exercises RDS as Oracle would.
> >
> > I'm not proposing that we should enhance NetPerf to do that 
> > (but that's 
> > OK with me).
> >
> > We created a tool rds-stress which does that.
> >
> > Scott Weitzenkamp (sweitzen) wrote:
> >     
> > > > WRT to merging RDS into the kernel - our current plans are 
> > > >         
> > to wait to 
> >     
> > > > see RDS adopted by more than Oracle - before approaching 
> > > >         
> > the kernel 
> >     
> > > > community about inclusion of RDS.
> > > >     
> > > >         
> > > I've seen statements before from someone from Oracle that 
> > >       
> > RDS was only
> >     
> > > for Oracle's use, for example, that person did not want 
> > >       
> > netperf changed
> >     
> > > to support RDS.
> > >
> > > Scott Weitzenkamp
> > > SQA and Release Manager
> > > Data Center Access Engineering
> > > Cisco Systems
> > >   
> > >       
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/