zfs, a directory that used to hold lot of files and listing pause

[Eugene M. Zheganin]

Hi.

On 21.10.2016 9:22, Steven Hartland wrote:
> On 21/10/2016 04:52, Eugene M. Zheganin wrote:
>> Hi.
>>
>> On 20.10.2016 21:17, Steven Hartland wrote:
>>> Do you have atime enabled for the relevant volume?
>> I do.
>>>
>>> If so disable it and see if that helps:
>>> zfs set atime=off <volume>
>>>
>> Nah, it doesn't help at all.
> As per with Jonathon what does gstat -pd and top -SHz show? 

gstat (while ls'ing):

dT: 1.005s  w: 1.000s
  L(q)  ops/s    r/s   kBps   ms/r    w/s   kBps   ms/w    d/s kBps   
ms/d   %busy Name
     1     49     49   2948   13.5      0      0    0.0      0 0    
0.0   65.0| ada0
     0     32     32   1798   11.1      0      0    0.0      0 0    
0.0   35.3| ada1

gstat (while idling):

dT: 1.003s  w: 1.000s
  L(q)  ops/s    r/s   kBps   ms/r    w/s   kBps   ms/w    d/s kBps   
ms/d   %busy Name
     0      0      0      0    0.0      0      0    0.0      0 0    
0.0    0.0| ada0
     0      2      2    255    0.8      0      0    0.0      0 0    
0.0    0.1| ada1

top -SHz output doesn't really differ while ls'ing or idling:

last pid: 12351;  load averages:  0.46,  0.49, 
0.46                                           up 39+14:41:02 14:03:05
376 processes: 3 running, 354 sleeping, 19 waiting
CPU:  5.8% user,  0.0% nice, 16.3% system,  0.0% interrupt, 77.9% idle
Mem: 21M Active, 646M Inact, 931M Wired, 2311M Free
ARC: 73M Total, 3396K MFU, 21M MRU, 545K Anon, 1292K Header, 47M Other
Swap: 4096M Total, 4096M Free

   PID USERNAME   PRI NICE   SIZE    RES STATE   C   TIME    WCPU COMMAND
   600 root        39    0 27564K  5072K nanslp  1 295.0H  24.56% monit
     0 root       -17    0     0K  2608K -       1  75:24   0.00% 
kernel{zio_write_issue}
   767 freeswitch  20    0   139M 31668K uwait   0  48:29   0.00% 
freeswitch{freeswitch}
   683 asterisk    20    0   806M   483M uwait   0  41:09   0.00% 
asterisk{asterisk}
     0 root        -8    0     0K  2608K -       0  37:43   0.00% 
kernel{metaslab_group_t}
[... others lines are just 0% ...]

Thanks.
Eugene.