On 8/5/21 6:50 PM, yukuai (C) wrote:

After applying this configuration, the number of null_blk in my
machine is about 650k(330k before). Is this still too low?

That seems low to me. If I run the attached script on a six year old
desktop with an eight core i7-4790 CPU it reports a little more than 5
million IOPS. Has kernel debugging perhaps been enabled in the kernel on
the test setup? Or is the system perhaps slowed down by security
mitigations?

By the way, there are no performance degradation.

Please wait with drawing a conclusion until you can run a workload on
your setup of several million IOPS.

Thanks,

Bart.