sshd high CPU occupancy

[giacombum]

I've installed FreeNAS recently and I've activated ssh service and emby plugin. I hear the CPU fan increase and decrease speed, so I look at top command and I see that ssh has 30% of cpu that seems very high, as you can see from here:

Code:

30103 giacomo	   1  46	0 82848K  7556K CPU0	0   5:43  34.59% sshd
39616	989	   23  20	0   370M   265M uwait   2  20:38   2.02% mono-sgen
30106 giacomo	   1  20	0 26440K  5296K select  3   0:05   0.54% scp
 2874 root		 12  47	0 53092K 19760K uwait   3   1:21   0.09% consul
30902 giacomo	   1  20	0 24272K  3476K CPU2	2   0:00   0.06% top
21792 root		 12  20	0   231M 36180K nanslp  3   3:29   0.01% collectd
39505 root		  6  20	0   140M 38144K select  2   0:05   0.00% python2.7
30061 giacomo	   1  20	0 82848K  7392K select  0   0:00   0.00% sshd
97544 nobody		1  20	0 12976K  2764K select  0   0:00   0.00% mdnsd
  227 root		  5  20	0   405M 93488K kqread  0   0:07   0.00% python3.6
 1952 root		  1  20	0 24700K 12524K select  2   0:03   0.00% ntpd
 2840 root		  1  20	0   407M 92368K kqread  2   0:07   0.00% uwsgi
 1618 root		  1 -52   r0  7600K  3572K nanslp  2   1:12   0.00% watchdogd
 4893 root		 15  20	0   491M   157M umtxn   1   1:02   0.00% uwsgi
 2828 root		  1  52	0   300M 61232K select  0   0:52   0.00% python3.6
 2878 root		 12  20	0 38384K  7884K uwait   1   0:04   0.00% consul-alerts
35390 root		  1  24	0   237M 57596K ttyin   1   0:02   0.00% python3.6
 1490 root		  1  20	0 59828K  6416K kqread  0   0:02   0.00% syslog-ng
 2143 root		  1  20	0   224M  6556K select  2   0:01   0.00% nmbd
 2151 root		  1  20	0   268M  7292K select  3   0:01   0.00% winbindd
90130 root		  1  33	0 13216K  3800K wait	2   0:00   0.00% sh
97716 root		  6  47	0   104M 19968K usem	3   0:00   0.00% python3.6

What is happening? 35% of cpu seems too much, also for a Core i3-6100

 

[Ericloewe]

Well, what's using SSH?

 

[giacombum]

Well, what's using SSH?

How can I check?

 

[SweetAndLow]

Replication, users? What things have you setup? Ssh didn't just randomly do stuff.

 

[giacombum]

Replication, users? What things have you setup? Ssh didn't just randomly do stuff.

I've setup one user, but I don't setup replication (for what I know...)

 

[giacombum]

Sorry, sshd daemon was at 35% because I was sending files from my little server to the nas. Now that the process is finished the sshd is at 0.1%. There isn't any process at more than 0.5% except collectd at 1.50% and python-3.6 at 1%, so I don't think that the cpu fan increasing speed is a problem related to some process... or not?

 

[Ericloewe]

If you were using SFTP or something else tunneled over SSH, there's nothing more to investigate here.