1

My system is Linux Mint 18.0

$ uname -a
Linux kes-desktop 4.8.0-30-generic #32~16.04.1-Ubuntu SMP Fri Dec 2 03:43:51 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

nload on the interface is

Outgoing:
##########################.  ########################
###########################  ########################
###########################  ########################
###########################  ########################
###########################  ########################
###########################  ########################  Curr: 93.85 MBit/s
###########################|#########################  Avg: 45.20 MBit/s
#####################################################  Min: 0.00 Bit/s
#####################################################  Max: 93.91 MBit/s
#####################################################  Ttl: 62.49 GByte

Here I copy files into ZFS system on remote host which is shared by NFS.

At this moment system is going unusable: it is very slow and I even can not move mouse and press keys on keyboard despite on that CPU load is about 5-10%. Here is the top at the moment:

$ top

top - 19:53:39 up 1 day,  2:19,  1 user,  load average: 0,37, 2,05, 2,40
Tasks: 216 total,   2 running, 214 sleeping,   0 stopped,   0 zombie
%Cpu(s):  7,6 us,  1,5 sy,  0,0 ni, 90,6 id,  0,3 wa,  0,0 hi,  0,0 si,  0,0 st
KiB Mem :  4043496 total,   129952 free,  2507016 used,  1406528 buff/cache
KiB Swap:  4194300 total,  3831708 free,   362592 used.  1205856 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                             
 2581 kes       20   0 3199148 1,427g  61108 R   9,3 37,0 558:33.70 firefox                                             
 1874 kes       20   0 2170124 489704  17584 S   3,0 12,1  64:28.95 cinnamon                                            
19707 kes       20   0  700760 125696  16000 S   2,3  3,1   3:39.68 skype                                               
 1084 root      20   0  283488   7660   1824 S   1,3  0,2  21:17.87 polkitd                                             
 1540 root      20   0  489044  77880  55732 S   1,3  1,9  38:55.45 Xorg                                                

It is like something happen with interrupts.

May I tune something to be able to work on this machine while copying files over NFS?

migrated from serverfault.com Jan 8 '17 at 19:43

This question came from our site for system and network administrators.

  • Is this a desktop system with a local console or is it remote with an X console ? – Iain Jan 8 '17 at 18:00
  • @Hanginoninquietdesperation This is the local system – Eugen Konkov Jan 8 '17 at 18:48
2

This looks very similar to an issue I had while experimenting with deduplication with ZoL, particularly when trying it on an NFS share. If you are using deduplication on the NFS share I would try disabling it. After my testing with dedup I never used it again anywhere. Also, as a trouble-shooting mechanism, have you tried un-sharing the NFS-shared data set and transferring data to it in some other way? Clearly, my answer only addresses two possibilities; I hope one of them helps you get to the problem.

  • The deduplication is not used in my configuration – Eugen Konkov Jan 8 '17 at 22:23
  • How about the other part; does this problem only happen when transferring data via NFS? Is your system unresponsive during other types of network transfers or disk-to-disk transfers to the same data set? – airhuff Jan 10 '17 at 4:28
  • I will check... – Eugen Konkov Jan 10 '17 at 8:01

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