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SubjectRe: [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@oracle.com]
>> Sent: Wednesday, April 02, 2008 10:38 AM
>> To: Scott Weitzenkamp (sweitzen)
>> Cc: Roland Dreier (rdreier); rds-devel@oss.oracle.com;
>> linux-kernel@vger.kernel.org; general@lists.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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