[SPDK] How to utilize multiple threads?

[Li Feng <fengli at smartx.com>]

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Hi experts,

When I'm digging into SPDK iscsi source codes, I have some doubt about the
threads/reactors.


Look at this example.

Start iscsi target on core 0-7:
```
app/iscsi_tgt/iscsi_tgt -L all -d 1 -m 0xff
```
I can see 8 threads which are polling.

But the acceptor is only running on the core 0, right?

This means all IOs are processed on core 0, no matter how many bdevs are
connecting ?


I can see sending NOP IN is a poller running on all reactors. But this is
not about read/write.

So how to utilize the other threads to maximum the iops and throughput?



Thanks in advance.

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