22 Zář
2020
22 Zář
'20
23:11
Hi,
We run around 50 knot servers around the world, with great success - thanks
for the software!
We are just a little curious about seemingly high CPU usage, and how best
to interpret the results, if someone could advise? Specifically, we are
seeing the majority of the cpu time in 'system' and not 'user', what
would
that suggest is happening perhaps?
Any tuning help gratefully received!
Our platform (sample)
24 Core CPU E5-2440 0 @ 2.40
64Gb RAM
SSD
knot-2.9.5, running on Centos 8.2
Currently receiving around 4k pps
Server is authoritative for a 278 zones, the largest zone file being around
600Mb
Output of top
top - 20:50:38 up 6 days, 4:49, 2 users, load average: 13.47, 12.34,
11.83
Tasks: 321 total, 2 running, 318 sleeping, 0 stopped, 1 zombie
%Cpu0 : 4.0 us, 34.1 sy, 0.0 ni, 60.3 id, 0.3 wa, 0.7 hi, 0.7 si,
0.0 st
%Cpu1 : 4.3 us, 19.4 sy, 0.0 ni, 75.3 id, 0.0 wa, 0.3 hi, 0.7 si,
0.0 st
%Cpu2 : 4.3 us, 33.8 sy, 0.0 ni, 60.9 id, 0.0 wa, 0.7 hi, 0.3 si,
0.0 st
%Cpu3 : 5.0 us, 21.2 sy, 0.0 ni, 73.2 id, 0.0 wa, 0.3 hi, 0.3 si,
0.0 st
%Cpu4 : 3.3 us, 34.9 sy, 0.0 ni, 61.5 id, 0.0 wa, 0.3 hi, 0.0 si,
0.0 st
%Cpu5 : 3.0 us, 20.2 sy, 0.0 ni, 76.2 id, 0.0 wa, 0.3 hi, 0.3 si,
0.0 st
%Cpu6 : 4.0 us, 35.2 sy, 0.0 ni, 60.4 id, 0.0 wa, 0.3 hi, 0.0 si,
0.0 st
%Cpu7 : 5.0 us, 18.7 sy, 0.0 ni, 76.0 id, 0.0 wa, 0.3 hi, 0.0 si,
0.0 st
%Cpu8 : 2.0 us, 35.0 sy, 0.0 ni, 62.3 id, 0.0 wa, 0.7 hi, 0.0 si,
0.0 st
%Cpu9 : 2.0 us, 20.0 sy, 0.0 ni, 77.7 id, 0.0 wa, 0.3 hi, 0.0 si,
0.0 st
%Cpu10 : 3.7 us, 34.4 sy, 0.0 ni, 61.2 id, 0.0 wa, 0.7 hi, 0.0 si,
0.0 st
%Cpu11 : 3.3 us, 20.7 sy, 0.0 ni, 75.7 id, 0.0 wa, 0.3 hi, 0.0 si,
0.0 st
%Cpu12 : 2.3 us, 34.6 sy, 0.0 ni, 62.1 id, 0.0 wa, 0.7 hi, 0.3 si,
0.0 st
%Cpu13 : 3.3 us, 20.7 sy, 0.0 ni, 75.7 id, 0.0 wa, 0.3 hi, 0.0 si,
0.0 st
%Cpu14 : 2.3 us, 33.6 sy, 0.0 ni, 59.7 id, 0.0 wa, 0.7 hi, 3.7 si,
0.0 st
%Cpu15 : 3.3 us, 19.7 sy, 0.0 ni, 76.3 id, 0.0 wa, 0.3 hi, 0.3 si,
0.0 st
%Cpu16 : 2.3 us, 34.0 sy, 0.0 ni, 58.7 id, 0.0 wa, 1.0 hi, 4.0 si,
0.0 st
%Cpu17 : 2.3 us, 21.5 sy, 0.0 ni, 75.8 id, 0.0 wa, 0.3 hi, 0.0 si,
0.0 st
%Cpu18 : 3.3 us, 34.8 sy, 0.0 ni, 57.2 id, 0.0 wa, 0.7 hi, 4.0 si,
0.0 st
%Cpu19 : 5.0 us, 19.3 sy, 0.0 ni, 75.1 id, 0.0 wa, 0.3 hi, 0.3 si,
0.0 st
%Cpu20 : 2.7 us, 35.3 sy, 0.0 ni, 60.0 id, 0.0 wa, 0.7 hi, 1.3 si,
0.0 st
%Cpu21 : 1.7 us, 20.5 sy, 0.0 ni, 77.2 id, 0.0 wa, 0.3 hi, 0.3 si,
0.0 st
%Cpu22 : 4.7 us, 32.4 sy, 0.0 ni, 58.5 id, 0.0 wa, 0.7 hi, 3.7 si,
0.0 st
%Cpu23 : 2.3 us, 19.0 sy, 0.0 ni, 78.3 id, 0.0 wa, 0.3 hi, 0.0 si,
0.0 st
MiB Mem : 64107.4 total, 46764.9 free, 11733.6 used, 5608.8 buff/cache
MiB Swap: 32248.0 total, 32248.0 free, 0.0 used. 51670.0 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
213370 knot 20 0 34.0g 9.6g 41784 S 644.9 15.3 1319:12
/usr/sbin/knotd
Thanks again for this great product.
Jonathan