Re: [SPDK] ioat copy submitted but not copy any bytes

* Re: [SPDK] ioat copy submitted but not copy any bytes
@ 2018-07-01  8:27 Cao, Gang
  0 siblings, 0 replies; 4+ messages in thread
From: Cao, Gang @ 2018-07-01  8:27 UTC (permalink / raw)
  To: spdk

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Are there any errors reported? Also could you try to build the debug version and dump related trace to take a look?

Thanks,
Gang

From: SPDK [mailto:spdk-bounces(a)lists.01.org] On Behalf Of 杨晔
Sent: Saturday, June 30, 2018 8:08 PM
To: spdk(a)lists.01.org
Subject: [SPDK] ioat copy submitted but not copy any bytes

Hello,

 What other issues should I pay attention to when using ioat copy?

 I just write an demo like the example "perf" did, but it can't copy any bytes.

 Here is my code structure:

  ...(spdk env init)

  ...(ioat init)

  malloc about 300 src strings and fill them(the malloc function I use is kernel function)

  malloc 300 dst strings

  for(i=0;i<BATCHNUM;i++)
  {
     for(j=0;j<BATCHNSIZE;j++)
     {
        spdk_ioat_submit_copy(t->chan, t, ioat_done, batchcopy[i]->elem[j]->dst, batchcopy[i]->elem[j]->src, batchcopy[i]->elem[j]->len);
        t->current_queue_depth++;
     }
  }

  while(t->current_queue_depth>0)
  {
     spdk_ioat_process_events(t->chan);
  }

And the ioat_done function is as follow:

  static void
  ioat_done(void *cb_arg)
  {
     struct ioat_chan_entry *t = (struct ioat_chan_entry *)cb_arg;
     t->current_queue_depth--;
  }

Another problem is the ioat channel can never be used if a program exits abnormally.

Thanks.

--

Yang Ye

Network Research Center, Institute of Computing Technology, Chinese Academy of Sciences,

NO.6 Kexueyuan South Road, Zhongguancun, Haidian District, Beijing, China (100190)

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