Reading from JuiceFS is too slow depending on kernel version?

[kyungwan-nam]

Our environment:

• JuiceFS version: juicefs version 1.1.1+2023-11-28.437f4e6
• OS: CentOS Linux 7
• Object storage: minio
• Metadata engine: Redis cluster
• Kernel: 4.19.93(slow), 3.10.0(not slow)

when copy a 10GB file using cp from our JuiceFS, it takes a long time depending on the kernel version.

• Mount our juicefs on 4.19.93 kernel version machine

cp -rp /data/10gb_file /tmp/

real	4m13.570s
user	0m0.043s
sys	0m8.606s

• Mount our juicefs on 3.10.0 kernel version machine

cp -rp /data/10gb_file /tmp/

real	0m31.855s
user	0m0.020s
sys	0m7.204s

in case of 4.19.93 kernel version machine, too many getattr operation occurs during copy a 10GB file
but, I didn't figure out why it happens.

https://juicefs.com/docs/community/performance_evaluation_guide/#juicefs-profile

• 4.19.93 kernel version machine

$ juicefs profile accesslog --interval 0
> JuiceFS Profiling                Refresh: 219 seconds  2024-02-16T20:13:09

Operation           Count     Average(us)          Total(us)     Percent(%)
getattr             35483            5836          207084929           94.7
read                76294             105            8041517            3.7
lookup                  1           11775              11775            0.0
open                    2            2958               5915            0.0
release                 1              24                 24            0.0
flush                   1               1                  1            0.0

• 3.10.0 kernel version machine

> JuiceFS Profiling                Refresh: 46 seconds  2024-02-19T17:57:57

Operation           Count     Average(us)          Total(us)     Percent(%)
read                76294             988           75372214          162.3
getattr                38            6027             229021            0.5
readdir                16            8760             140158            0.3
lookup                  2           11680              23360            0.1
open                    2            2949               5898            0.0
opendir                 8               5                 43            0.0
release                 1               9                  9            0.0
flush                   1               9                  9            0.0
releasedir              8               1                  8            0.0

I'm not sure the kernel version cause this issue.
but, the other factors (e.g. machine location, machine spec, juicefs filesystem) are same. so I think the kernel version causes
I wondered Isn't there any requirement about the kernel version for JuiceFS?
Can you advise on this?
Thanks in advance.