Jonathan,

there must be something wrong with the networking. How many `server.listen` configuration values
do yo have? Is it a physical server or a virtual one? What is the network card used?

Daneil

On 9/23/20 1:18 PM, Jonathan Hewlett wrote:
> Daniel
> Thank you for your time
>
> # knotc status workers
> UDP workers: 24, TCP workers 24, background workers: 10 (running: 0, pending: 0)
>
> image.png
>
> Kind regards
> Jonathan
>
>
> On Wed, 23 Sep 2020 at 07:59, <daniel.salzman@nic.cz <mailto:daniel.salzman@nic.cz>> wrote:
>
>     Hi Jonathan,
>
>     On 2020-09-22 23:11, Jonathan Hewlett wrote:
>     > Hi,
>     >
>     > We run around 50 knot servers around the world, with great success -
>     > thanks for the software!
>
>     Thanks for this feedback :-)
>
>     >
>     > 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?
>
>     Could you provide me the output from `knotc status workers`?
>
>     I like htop. Are you able to send me a screenshot when running htop? :-)
>     [Don't forget to configure:
>       F2
>       Display options->Detailed CPU time
>     (System/IO-Wait/Hard-IRQ/Soft-IRQ/Steal/Guest)
>       F10
>     ]
>
>     Best,
>     Daniel
>
>     >
>     > 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
>
>
>
> --
> --\--
> Jonathan Hewlett
> ^Senior\ Systems\ Engineer\n$
> CentralNic Group plc (LSE:CNIC)
> https://www.centralnic.com <https://www.centralnic.com/>
> Tel: +44.7548243020
> CentralNic Group plc is a company registered in England and Wales with company number 8576358. Registered Offices: Saddlers House, Gutter Lane, London EC2V 6AE.