On Thu, Jun 15, 2023 at 10:06 PM Yu Kuai <yukuai1@xxxxxxxxxxxxxxx> wrote: > > > FIO configuration file: > > > > > > [global] > > > name=random reads and writes > > > ioengine=libaio > > > direct=1 > > > readwrite=randrw > > > rwmixread=70 > > > iodepth=64 > > > buffered=0 > > > #filename=/dev/ram0 > > > filename=/dev/dm/test > > > size=1G > > > runtime=30 > > > time_based > > > randrepeat=0 > > > norandommap > > > refill_buffers > > > ramp_time=10 > > > bs=4k > > > numjobs=400 > > > > 400 is too aggressive, I think spin_lock from fast path is probably > > causing the problem, same as I met before for raid10... In our workload, we run about this many KVM guests on one machine, and when many of the VMs use their disks, we experienced almost the same problem with raid1. Thanks, Ali
