linux-kernel - RE: [ofa-general] InfiniBand/iWARP/RDMA merge plans for 2.6.26 (what'sin infiniband.git)

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Message-ID: <A15335FBE9BD2449AF2C9EF3D1EB8EA305547248@xmb-sjc-216.amer.cisco.com>
Date:	Wed, 2 Apr 2008 10:04:23 -0700
From:	"Scott Weitzenkamp (sweitzen)" <sweitzen@...co.com>
To:	"Richard Frank" <richard.frank@...cle.com>
Cc:	"Roland Dreier (rdreier)" <rdreier@...co.com>,
	<rds-devel@....oracle.com>, <linux-kernel@...r.kernel.org>,
	<general@...ts.openfabrics.org>
Subject: RE: [ofa-general] InfiniBand/iWARP/RDMA merge plans for 2.6.26 (what'sin infiniband.git)

I'd like to see netperf comparisions of UDP_STREAM/UDP_RR vs
RDS_STREAM/RDS_RR, does anyone have a patch that will apply cleanly to a
recent netperf?

Scott Weitzenkamp
SQA and Release Manager
Data Center Access Engineering
Cisco Systems


 

> -----Original Message-----
> From: Richard Frank [mailto:richard.frank@...cle.com] 
> Sent: Wednesday, April 02, 2008 11:00 AM
> To: Scott Weitzenkamp (sweitzen)
> Cc: Roland Dreier (rdreier); rds-devel@....oracle.com; 
> linux-kernel@...r.kernel.org; general@...ts.openfabrics.org
> Subject: Re: [ofa-general] InfiniBand/iWARP/RDMA merge plans 
> for 2.6.26 (what'sin infiniband.git)
> 
> 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@...cle.com] 
> >> Sent: Wednesday, April 02, 2008 10:38 AM
> >> To: Scott Weitzenkamp (sweitzen)
> >> Cc: Roland Dreier (rdreier); rds-devel@....oracle.com; 
> >> linux-kernel@...r.kernel.org; general@...ts.openfabrics.org
> >> 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
> >>>   
> >>>       
> 
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