Excessive processor use

[randomwhitetrash]

Since 4.3.22 or so I noticed that after a while VBox is starting to use a lot of processor power. Everything is OK when it starts but after few hours its 90-100% of one thread and some minor-medium use on other threads (35%-40% of total processor time, i7 4770K, 4 cores 8 threads).

Host is Windows 8.1 Guest is 64bit Ubuntu 14.04

It was initially installed under 4.3.20 and there was no problem. It only appeared recently.

[randomwhitetrash]

VBox Log

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Of course the above is happening regardless of whether guest is idle or not. I also noticed that after few hours guest becomes sluggish, yet guest's System Monitor shows processor use of about 10%.

[Frank Mehnert]

I would still like to know if there is any guest thread running maniac, could be also VBoxService for instance. Please post the output of 'top -d5' in your guest when the processor load raised (but please wait for at least 10 seconds to let it stabilize).

[randomwhitetrash]

I stand corrected, apparently System Monitor does not show the reality.

Compiz is running at 200% most of the time when any application is running (usually firefox, netbeans, mysqlworkbench and tortoisehg).

I now suspect this has something to do with guestadditions. I am running full screen 2 monitors and it started happening since I installed guest additions 4.3.22. Before then I was always running guest additions 4.3.12 because every later version would not work properly - would freeze me out of control interface for minimizing screens and also would often loose my resize settings and start in window. 4.3.22 seems to have fixed all that but perhaps introduced this strain on compiz... or perhaps its unrelated.

top - 09:37:44 up  3:03,  3 users,  load average: 1.07, 0.82, 0.89
Tasks: 206 total,   4 running, 202 sleeping,   0 stopped,   0 zombie
%Cpu(s): 15.8 us,  2.5 sy,  0.0 ni, 81.6 id,  0.1 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem:   3104416 total,  2581080 used,   523336 free,    51000 buffers
KiB Swap:  2095100 total,   242176 used,  1852924 free.   650324 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND     
 2318 user      20   0 2024316 428636  24048 R 209.7 13.8  96:54.69 compiz      
 1279 root      20   0  615968 226804  47104 R  39.3  7.3  21:09.82 Xorg        
   10 root      20   0       0      0      0 S   6.6  0.0   0:02.06 rcuos/2     
    1 root      20   0   33764   2524   1220 S   0.0  0.1   0:01.07 init        
    2 root      20   0       0      0      0 S   0.0  0.0   0:00.03 kthreadd    
    3 root      20   0       0      0      0 S   0.0  0.0   0:00.79 ksoftirqd/0 
    4 root      20   0       0      0      0 S   0.0  0.0   0:00.00 kworker/0:0 
    5 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/0:+