Slow command output in KVM Debian Guests

Hi,

I’m running ON front end ( isolated VM ) + single KVM node backed by 2 SATA disk in RAID1 ( HP P400 ). I did some disk benchmarks and got some reasonable results as per my knowledge.

ss_20190209_044604

But there is small issue when issuing commands. Some command output takes few seconds to execute and output.

Peek%202019-02-09%2004-55

I attached a GIF image, is anyone can help me to resolve this delay ?

PS : I just found out that this only happening on Debian guest KVM’s