arcstat showing most fields as zero

[aaronjwood]

System information

Type	Version/Name
Distribution Name	Ubuntu
Distribution Version	19.10
Linux Kernel	5.3.0-23-generic #25-Ubuntu SMP
Architecture	x86_64
ZFS Version	0.8.1-1ubuntu14
SPL Version

Describe the problem you're observing

On my system arcstat doesn't seem to work at all. Some examples:

arcstat
    time  read  miss  miss%  dmis  dm%  pmis  pm%  mmis  mm%  arcsz     c
20:43:52     0     0      0     0    0     0    0     0    0    15G   15G

arcstat -x
    time   mfu   mru  mfug  mrug  eskip  mtxmis  dread  pread  read
20:45:45     0     0     0     0      0       0      0      0     0

Describe how to reproduce the problem

Just run arcstat or arcstat -x.

Include any warning/errors/backtraces from the system logs

[Fabian-Gruenbichler]

this is not a bug - you probably want to do "arcstat 30" or some other interval..

[aaronjwood]

My fault. I was expecting the older behavior from the tool. Passing an interval of 1 shows valid data after 1 second.

Since the first print always shows zeros for most fields would it make sense to not print anything at all until the first iteration of the interval has been reached?

[johnramsden]

I could take a look at this if I know what the expected behavior should be.

Would it be correct to not print until some data has been generated for at least one column? Or is the behavior currently correct?

[stale]

This issue has been automatically marked as "stale" because it has not had any activity for a while. It will be closed in 90 days if no further activity occurs. Thank you for your contributions.