[Openib-windows] zero copy transfer for XP

Thu Jan 25 05:23:40 PST 2007

Hello Tzachi,

Thank you for your answer. Well that is a good news.  Sorry, but I still
have some questions. Could you explain how the SDP relates to the WSD
which does not seem to work for the XP with the driver 1.0.0.331. I always
believed they are the same. Actually my programs have already been
developed for sdp and udapl under linux now I would like to port them to
windows xp. Does the udapl work under 32 bit XP ? What about zero copy
with udapl ? Where can I find the sdk for windows udapl ? I know it is a
lot.  8) 

regards,gabor

On 1/24/07 10:40 PM, "Tzachi Dar" <tzachid at mellanox.co.il> wrote:

> For windows XP we do have SDP support.
> Actually SDP is being supported on windows xp / windows server 2003 for their
> 32 bits version and their 64 bits version.
> Currently our SDP doesn't have zero copy but standard benchmarks show maximum
> BW in one direction of 1300 MB/sec and latency of 7 us in Ping-Pong tests.
> This numbers have been achieved on 64 bits systems, but even on XP 32 bit
> systems we were able to measure BW of more than 1100 MB/sec.
> Although this is not zero copy, this BW is achieved using only one processor,
> so on a typical machine today that has more than one core, you can enjoy the
> BW and still have one (or more) processors free for doing other work.
>  
> Please note that the performance of SDP as well as stability have improved
> since we have last worked with SilverStorm.
> I believe that creating a program with normal socket API, will be much easier
> than working with DAPL, and you can have your program ready much faster.
> Currently our SDP supports all major socket API including send, recv, WSASend,
> WSARecv, (all completion methods including synchronous, overlapped , a
> function call, an event or completion ports).
>  
> My experience show that the limiting factor for BW is the memory speed, and
> with new computers that are shipped today this memory is high enough for
> almost any demand. If you want I can send you a program that will allow you to
> measure the true performance of your machine and will give you a good
> estimation of the BW that you can achieve.
>  
> Thanks
> Tzachi
>>  
>>  
>> 
>>  From: openib-windows-bounces at openib.org
>> [mailto:openib-windows-bounces at openib.org] On Behalf Of Gábor  Forgács
>> Sent: Wednesday, January 24, 2007 7:36 PM
>> To:  openib-windows at openib.org
>> Subject: [Openib-windows] zero copy  transfer for XP
>> 
>>  
>> Hello,
>> 
>> 
>> I just joined to the group recently.  I can not find basic information
>> regarding to the windows xp infiniband  development.
>> I can not find the information if there is any ULP for windows  xp with zero
>> copy support. Could someone help me out ?
>> I made working the  IPOIB but its speed is quite low under 100 MB/s .
>> Currently I believe that  there is no sdp support
>> for windows xp only for the windows 2003 at least  that is the information I
>> received from the silverstorm. Is it correct  ?
>> What would be the way to make work udapl for windows xp e.g. the dapltest
>> program ? Thank you for your help.
>> 
>> regards,gabor 
> 

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