1

kcompactd is spiking while we are PUTting a file using FTP to another host, and the transfer rate is dropping.

    top - 18:39:59 up 31 days,  6:23,  4 users,  load average: 1.15, 0.42, 0.32
Tasks: 1947 total,   2 running, 1942 sleeping,   0 stopped,   3 zombie
%Cpu0  :  2.9 us, 29.4 sy,  0.0 ni, 66.7 id,  0.0 wa,  0.0 hi,  1.0 si,  0.0 st
%Cpu1  :  1.0 us, 13.7 sy,  0.0 ni, 80.4 id,  4.9 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu2  :  0.0 us, 23.5 sy,  0.0 ni, 75.5 id,  1.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu3  :  0.0 us, 44.3 sy,  0.0 ni, 55.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem:  82382288 total, 81858160 used,   524128 free,    38692 buffers
KiB Swap:  4194300 total,     9508 used,  4184792 free. 14808308 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
   32 root      20   0       0      0      0 R 88.57 0.000 289:18.19 kcompactd0
18324 root      20   0   44160   7452   5712 S 9.524 0.009   0:19.85 lftp

Why could that be?

OS is SLES12-SP3 running Kernel 4.4.162-94.72-default

/proc/meminfo
MemTotal:       82382284 kB
MemFree:          649840 kB
MemAvailable:   10539176 kB
Buffers:           41912 kB
Cached:         14042992 kB
SwapCached:          468 kB
Active:         21716412 kB
Inactive:        6664344 kB
Active(anon):   16632900 kB
Inactive(anon):  1822684 kB
Active(file):    5083512 kB
Inactive(file):  4841660 kB
Unevictable:          80 kB
Mlocked:              80 kB
SwapTotal:       4194300 kB
SwapFree:        4184324 kB
Dirty:               624 kB
Writeback:             0 kB
AnonPages:      14295500 kB
Mapped:           218488 kB
Shmem:           4159732 kB
Slab:             901184 kB
SReclaimable:     728604 kB
SUnreclaim:       172580 kB
KernelStack:       35520 kB
PageTables:       938124 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    19785440 kB
Committed_AS:   29080800 kB
VmallocTotal:   34359738367 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
HugePages_Total:   25000
HugePages_Free:     2223
HugePages_Rsvd:       18
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:     5922752 kB
DirectMap2M:    30777344 kB
DirectMap1G:    49283072 kB
0

Updating the kernel fixed this BTW...

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