Re: [PATCH v2 19/20] scsi: ufs: Implement polling support

Bart Van Assche <bvanassche@xxxxxxx> · Tue, 30 Nov 2021 06:26:10 -0800

On 11/30/21 12:43 AM, Bean Huo wrote:
On Fri, 2021-11-19 at 11:57 -0800, Bart Van Assche wrote:
On my test setup this patch increases IOPS from 2736 to 22000 (8x)
for the
following test:

for hipri in 0 1; do
     fio --ioengine=io_uring --iodepth=1 --rw=randread \
     --runtime=60 --time_based=1 --direct=1 --name=qd1 \
     --filename=/dev/block/sda --ioscheduler=none --gtod_reduce=1 \
     --norandommap --hipri=$hipri
done

For 4KB random read, direct IO, and iodepth=1, we did not see an
improvement in IOPS due to this patch. Maybe the test case above is not
sufficient.

Hi Bean,

Which test has been run? Polling is only enabled if --hipri=1 is specified
to fio and --ioengine=io_uring is the only I/O engine on Android that supports
that flag.

Thanks,

Bart.