[ofw] Need code examples

Wed Nov 25 00:56:21 PST 2009

I'm using RC QP connection but data in the buffer on receive side changes
without any actions (ibv_post_recv) on receive side. I'm tried to use
multiple buffers to send/recv data frames but on receive side only ONE
buffer (first registered with ibv_reg_mr) works. I don't found any examples
where used a pool of buffers for receive side (for sender it is). Would you
help me in such things?

Thanks.

Zh.Sergey

From: Leonid Keller [mailto:leonid at mellanox.co.il] 
Sent: Wednesday, November 25, 2009 11:25 AM
To: Сергей Жуков; Tzachi Dar
Cc: ofw at lists.openfabrics.org
Subject: RE: [ofw] Need code examples

It's not a real application.

It's a performance test, demonstrating a possibilty of IB HW to send data at
> 4GBps.

That's why it is using only one buffer.

That's why it doesn't care about synchronization.

But you may write a real application working almost as fast as this one.

You will have to use a pool of buffers and RC QP connection.

If the receiver side won't manage to read the data, it won't post receive
WQEs, making thereby a back pressure on the sender.

  _____  

From: ofw-bounces at lists.openfabrics.org
[mailto:ofw-bounces at lists.openfabrics.org] On Behalf Of ?????? ?????
Sent: Wednesday, November 25, 2009 9:21 AM
To: Tzachi Dar
Cc: ofw at lists.openfabrics.org
Subject: RE: [ofw] Need code examples

Hello Tzachi!

I have tried to use sources from latest SVN and have deal with send_bw
example. In this example I have inserted 2 bytes frame counter for receiving
control.

I found out that on receive side there is no syncronization between
write/read operations. Sending side writing frames in the shared memory

(ctx->buff) on receive side while previous frames are not read yet.

Thanks.

Zh.Sergey.

From: Tzachi Dar [mailto:tzachid at mellanox.co.il] 
Sent: Thursday, November 19, 2009 4:06 PM
To: Сергей Жуков
Subject: RE: [ofw] Need code examples

Please let me know if you need more help.

Thanks

Tzachi

  _____  

From: ofw-bounces at lists.openfabrics.org
[mailto:ofw-bounces at lists.openfabrics.org] On Behalf Of Leonid Keller
Sent: Thursday, November 19, 2009 11:28 AM
To: Сергей Жуков
Cc: ofw at lists.openfabrics.org
Subject: RE: [ofw] Need code examples

I meant  openfabric stack.

As Sean mentioned, it is found under svn://openib.tc.cornell.edu/gen1/trunk.

We provide usually only binaries, but we have the same sources as openfabric
stack, so you can look there.

  _____  

From: Сергей Жуков [mailto:zhukoff79 at mail.ru] 
Sent: Thursday, November 19, 2009 11:15 AM
To: Leonid Keller
Cc: ofw at lists.openfabrics.org
Subject: RE: [ofw] Need code examples

Thanks but where I can get it?

In my distrib pack (MLNX_WinOF_wnet_x64_2_0_3) there is no such dirs.

How I cat get perftests from IB source tree?

From: Leonid Keller [mailto:leonid at mellanox.co.il] 
Sent: Thursday, November 19, 2009 12:06 PM
To: Сергей Жуков; ofw at lists.openfabrics.org
Subject: RE: [ofw] Need code examples

tools\perftests or test\perftest in IB source tree

  _____  

From: ofw-bounces at lists.openfabrics.org
[mailto:ofw-bounces at lists.openfabrics.org] On Behalf Of ?????? ?????
Sent: Thursday, November 19, 2009 8:51 AM
To: ofw at lists.openfabrics.org
Subject: [ofw] Need code examples

Hello!

Is there developers who wrote applications with RDMAoIB support and can help
me in such things? I need for source examples that do send/recv with high
perfomance and throughoutput on IB.

Best regards.

Zh. Sergey

  _____  

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