[ofa-general] SDP - How to?

[Bart Van Assche]

On Wed, Jun 10, 2009 at 4:07 PM, Zafar Gilani<zafargilani at gmail.com> wrote:
> I read a paper on "Zero Copy Sockets Direct Protocol over InfiniBand". I had
> a few questions, if anybody could answer I will be thankful.
>
> 1. SDP BCopy approach can be used without the change of the code via the use
> of AF_INET_SDP parameter when calling socket() system call. But how can I
> implement SDP ZCopy approach if I want to implement ZCopy_Read and
> ZCopy_Write methods?
>
> 2. Is there any documentation regarding how to implement SDP ZCopy? Any
> Hello World sort of example code that I can use to learn how to work with
> this?
>
> 3. SDP BCopy is better for smaller messages, but how small? Is 64K a good
> threshold to change from BCopy to ZCopy at 128K?

May I ask you why you are looking at SDP ? The performance of IPoIB in
connected mode and with large MTU is close to that of SDP, while the
former is a lot easier to use than the latter.

Bart.