The 0.11.8 driver takes a long time to take a snapshot

[yito24]

It is slow to take snapshots of 0.11.8 in RHEL8.
For 0.11.6, it takes about 0.361 seconds to snapshot 4 volumes.
0.11.6.txt

For 0.11.8, it takes about 12 seconds to snapshot 4 volumes.
0.11.8.txt
lsblk.txt

In the case of CentOS7, taking a snapshot takes a very long time.
This symptom is very noticeable.
For 0.11.6, it takes about 4.174 seconds to snapshot 4 volumes.
0.11.6_el7.txt

For 0.11.8, it takes about 02:18.064 seconds to snapshot 4 volumes.
0.11.8_el7.txt
lsblk_el7.txt

I have registered with the same information in the past, but I think this issue is important.
#373

[iamandrii]

Hi @yito24! Thanks for your concern. I will investigate the issue and will reach to you if I'll find something.

[yito24]

Hi @iamandrii,

When comparing, we found that up to 0.11.6 the snapshot acquisition time was within 0.3 seconds, but in 0.11.7 it became extremely slow.
I think that this function implemented in 0.11.7 is causing the slowdown.
"Implement tracking bios in dormant state"

I think that this function is unnecessary.

[yito24]

Additional Information

I tested a 6TB LVM and a 4TB basic partition.
It took about 18 minutes to create a snapshot for each.
The larger volume size, it will take to create a snapshot.

Please see the attachment for details.
backup_20241007162224.txt
lsblk.txt