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fix: io_uring sqpoll issue_time empty when kernel not yet read sq #1594

Merged
merged 1 commit into from
Jul 15, 2023
Merged

fix: io_uring sqpoll issue_time empty when kernel not yet read sq #1594

merged 1 commit into from
Jul 15, 2023

Commits on Jul 6, 2023

  1. fix: io_uring sqpoll issue_time empty when kernel not yet read sq 

    In io_uring sqpoll mode, when kernel side thread has not yet read 
the sqring before second fio_ioring_commit() called, the 
sq_ring.head will remain the same. The second 
fio_ioring_commit() will initialize the wrong io_u's issue_time. 
The old(in head) io_u‘s issue_time will to be initialized twice and 
new(in tail - 1) io_u's issue_time will not to be initialized.
This problem will cause clat is weird, sometimes larger than lat.

Signed-off-by: Jueji Yang <jueji.yang@gmail.com>
    @yangjueji
    yangjueji committed Jul 6, 2023
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