在 2021/6/4 上午2:01, Jens Axboe 写道:
On 6/3/21 6:53 AM, Hao Xu wrote:
Hi Jens,
I've a question about poll_multi_file in io_do_iopoll().
It keeps spinning in f_op->iopoll() if poll_multi_file is
true (and we're under the requested amount). But in my
understanding, reqs may be in different hardware queues
for blk-mq device even in this situation.
Should we consider the hardware queue number as well? Some
thing like below:
That looks reasonable to me - do you have any performance
numbers to go with it?
Not very easy for me to construct a good case. I'm trying to
mock the below situation:
manully control uring reqs to go to 2 hardware queues, like:
hw_queue0 hw_queue1
heavy_req simple_req
heavy_req simple_req
... ...
heavy_req is some request that needs more time to complete,
while simple_req takes less time. And make the io_do_iopoll()
alway first spin on hw_queue0.
any ideas?
Thanks,
Hao
