[ofw] WSD Detail Sample Code

[suo zhang]

Hi

Following is our question.

Thanks

Suo

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--------------------------------------------



We already wrote a IOCP and WinSocket based communication program. The
testing upon Infiniband indicated that this program still go over the
IPOverIP and has the overhead of Windows IP stack.



We saw this PPT and want to know how our WinSocket based program can fully
utilize the capabilities of Inifniband RDMA and how to write code over WSD
to avoid the overhead of Windows IP stack.



We just need a sample code like the source code of tool
SDPConnect.exe(within the Mallanox driver tools folder) etc. It showed great
performance we can’t achieved by our WinSocket code.



We’ve got some progress improvement:

1.       By searching the source code in OpenFabric, it turns out that these
open source include some tools’ source code, like this c file attached;

2.       There was some code founded in such tool’s source code like:

while (ccnt < user_param->iters || rcnt < user_param->iters ) {

          while (scnt < user_param->iters && (scnt - ccnt) <
user_param->tx_depth / 2) {

                   ib_send_wr_t  *bad_wr;

                   tposted[scnt] = get_cycles();

                   ib_status = ib_post_send(qp, &ctx->wr, &bad_wr);

                   if (ib_status != IB_SUCCESS) {

                            fprintf(stderr, "Couldn't post send: scnt=%d
ib_status %d\n",

                                      scnt,ib_status);

                            return 1;

                   }

                   ++scnt;

                   PERF_DEBUG("scnt = %d \n",scnt);

          }



But no document just have to guess from the source code for what “qp”,
“ctx” means and how to use them. These “ib_” initiated APIs were
absolutely NOT WinSocket APIs. What we asked for is SDK or documents for how
to using such API and which Header files we should include and which lib
have to be linked. A sample project will be OK if no such document exists.




Thanks

Suo
2011/1/25 Smith, Stan <stan.smith at intel.com>

> Please submit modified question to ofw at lists.openfabrics.org
>
>
>
> Furthermore, please identify which sample code you are referring to in
> order that someone can respond to your question.
>
>
>
> Which Windows OS and processor (x86,x64,ia64).
>
>
>
> Generally speaking WSD (WinSock Direct) is not used directly but utilized
> by opening a socket(AF_INET) which beneath the socket layer that has a WSD
> provider enabled for the specific address family.
>
> For winOFED 2.3 release, run ‘installsp –l’ to see WSD providers.
>
> WSD in no longer enabled by default for svr2008* – see ‘installsp –I’
>
>
>
> Stan.
>
>
>
>
>
> From: *Suo Zhang* <zhangs at bjcarnation.com.cn>
> Date: 2011/1/20
> Subject: WSD Detail Sample Code
> To: membership at openfabrics.org
>
> Hi
>
> When I use WSD in my project, I found the sample code is very difficult to
> use. Because the sample code is very simple.
>
> I want to know where can I get a detail sample code for WSD. Because my
> application must use zero copy to get good performance.
>
> Thanks
>
> Best regards
>
>
>
> 张锁 Suo Zhang
>
> Sales Engineer
>
> 北京石竹科技有限公司
>
> Beijing Carnation Technologies Limited
>
> Mobile +86-186-1175-6167
>
> Tel：+8610-68587971-8029
>
> Fax：+8610-68587975
>
> Http://www.vme.cn <http://www.vme.cn/>
>
>
>
>
>
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