On 11/30/21 7:40 AM, Bean Huo wrote:

It is the test case in your commit message. If iodepth=1, there is no
performance improvement. Increase the io-depth to multiple, for
example, let iodepth= CPU core counter. I see that the interrupt
overhead is significantly increased when the request is completed, so
IO_polling will win compared to the interrupt mode.

Hi Bean,

It is not guaranteed that polling will result in a significant performance
improvement. I assume that on my test setup the improvement is so
significant because the interrupt coalescing delay. Maybe the interrupt
coalescing delay is much smaller on your test setup.

Bart.