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

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Message-ID: <47F3C9BB.5040009@oracle.com>
Date:	Wed, 02 Apr 2008 13:00:27 -0500
From:	Richard Frank <richard.frank@...cle.com>
To:	"Scott Weitzenkamp (sweitzen)" <sweitzen@...co.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)

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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