[ofa-general] SDP - How to?

[Amir Vadai]

HI,

The number I sent you were measured using netperf TCP_STREAM test. With 
unmodified Mellanox ofed 1.4 running on high end hosts.

- Amir

On 06/18/2009 09:55 AM, Zafar Gilani wrote:
> Hi Amir,
>
> I hope you are fine! I want to carry out benchmark testing to compare 
> IPoIB and SDP protocols on the cluster I am working on. Where can I 
> get test cases (such as pt2pt communications) to carry out these 
> tests? What approach did you use in your benchmark test that you sent 
> me (your sent message attached)?
>
> Thanks in advance!
>
> On Thu, Jun 11, 2009 at 11:22 AM, Amir Vadai <amirv at mellanox.co.il 
> <mailto:amirv at mellanox.co.il>> wrote:
>
>     Hi Zafar,
>
>     I am the maintainer of SDP in OFED.
>
>     The current SDP implementation does not have ZCopy. What we have
>     is BCopy and something that we call BZcopy.
>     Small packets (<=32k) are sent using BCopy - meaning the SEND verb
>     is in use and data is not zero copied.
>     Packets bigger than 32K are sent using BZcopy - they are also sent
>     using the SEND verb but they are zero copied on the sender side.
>     on the RX side packets are memcpy'ed.
>     When we implement ZCopy it will be automatic too - when sending
>     packets bigger than a threshold the driver will automatically use
>     RDMA verb instead of the SEND.
>
>     BTW, your numbers are different that what we measured. See
>     attached. Was measured on a high end host using QDR IB PCI gen 2
>     and Mellanox ofed 1.4.
>
>     - Amir
>
>
> Best Regards,
> Zafar
>
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