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poor performance when use qcow backend #604

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winglq opened this issue Dec 13, 2019 · 0 comments

winglq commented Dec 13, 2019

Hi experts,
I have a nvme driver on hand and tested the performance of tcmu-runner.
The following is my test steps:

make filesystem on the nvme driver.
use qemu-img create a raw image on the new created filesystem.
use this image as lio backstore, and create the iscsi LUN.
login iscsi target
run fio on the new attached LUN.
fio command:
fio --name=nvme --file=/dev/sdn --rw=randwrite --bs=4k --iodepth=32 --size=10G --direct=1 --ioengine=libaio
the iops is 45k.
run fio on the mounted filesystem directly(nvme driver).
the iops is 220k.

Any idea why the iops down graded so many? How could I improve the performance?
Thanks.

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