For higher number of jobs(>=64), we are seeing ~8% regression with this patch.
Tool: fio with io_uring engine [1] +------------+------------+-------------------+ | numjobs | before | after patch | +------------+------------+-------------------+ | 1 | 89 | 88.8 (-0.22%) | | 2 | 169 | 168 (-0.59%) | | 4 | 338 | 337 (-0.30%) | | 8 | 533 | 533 (0.00%) | | 16 | 538 | 541 (+0.56%) | | 32 | 685 | 716 (+4.53%) | | 64 | 933 | 859 (-7.93%) | | 128 | 941 | 867 (-7.86%) | +------------+------------+-------------------+ * Metric: IOPS (K) (Block device, QD = 1, bs = 4K, Random Read) As shown in the table above, while performance is comparable at low job counts, there is a drop starting from 64 jobs after this patch. HW info: Intel(R) Core(TM) Ultra 7 265K CPU=20 IRQ-CPU are 1:1 mapped. [1] fio -filename=/dev/nvme0n1 -direct=1 -size=4g -rw=randread \ -numjobs=$(numjobs) -bs=4096 -ioengine=io_uring -iodepth=1 \ -name=uring_test --registerfiles=1 --ramp_time=5 \ --group_reporting --thread
