Re: How to increase maximum user cpu usage allowed on a multi core system?

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On Wed, 18 Mar 2015 18:19:54 +0100
Heinz Diehl <htd+ml@xxxxxxxxxx> wrote:

> 1. Download a kernel tarball from kernel.org
> 2. Unpack it into /usr/src
> 3. Copy .config from the latest Fedora kernel into the kernel toplevel
>    sourcedir (it is stored in /boot).
> 4. "make oldconfig"
> 5. "make"
> 6. "make modules_install"
> 7. "make install"
> 8. Reboot
> 
> Step 3. is for convenience, you can of course use your own .config.
> This kernel will live peacefully alongside of your Fedora kernels.
 
Did this, and unlike for you, in step 5 it still only used a single
thread. I even tried it as root to be sure, and single thread for root
also.

Poma has directed me to an expert who is looking into it.

Perhaps I should try next a kernel patched with bfs like yours are.


$ top                                                                                                                                                                                                                                        
top - 13:24:55 up 3 days, 37 min, 51 users,  load average: 0.77, 0.52, 0.27
Tasks: 333 total,   3 running, 330 sleeping,   0 stopped,   0 zombie
%Cpu(s): 17.2 us,  3.8 sy,  0.0 ni, 78.8 id,  0.2 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem : 16334484 total,   195200 free,  1649032 used, 14490252 buff/cache
KiB Swap: 28979304 total, 28978864 free,      440 used. 13515520 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                                                                                                                  
10851 stan      20   0  157948  28904  10588 R   3.0  0.2   0:00.09 cc1                                                                                                                                                                      
30672 stan      20   0  837028 136976  79184 S   2.0  0.8  12:20.34 konsole                                                                                                                                                                  
    7 root      20   0       0      0      0 S   1.0  0.0   4:52.56 rcu_preempt                                                                                                                                                              
 2804 root      20   0   16876   3012   2704 S   1.0  0.0  41:41.74 audio-entropyd                                                                                                                                                           
29910 root      20   0  382100 136820  62968 S   1.0  0.8  25:46.96 Xorg.bin                                                                                                                                                                 
10745 stan      20   0  146812   4528   3344 R   0.7  0.0   0:00.03 top                                                                                                                                                                      
10794 stan      20   0    9808   2172   1748 S   0.7  0.0   0:00.02 gcc                                                                                                                                                                      
10803 stan      20   0   10072   2324   1752 S   0.7  0.0   0:00.02 gcc                                                                                                                                                                      
11472 stan      20   0 1219368 347856 100576 S   0.7  2.1   1:59.81 firefox                                                                                                                                                                  
30134 stan      20   0  361860  18708  15944 S   0.7  0.1   4:08.11 clipit                                                                                                                                                                   
    3 root      20   0       0      0      0 S   0.3  0.0   0:04.80 ksoftirqd/0                                                                                                                                                              
   27 root      rt   0       0      0      0 S   0.3  0.0   0:01.88 migration/5                                                                                                                                                              
10357 stan      20   0  110808   2896   2276 S   0.3  0.0   0:00.01 make                                                                                                                                                                     
10720 stan      20   0    9912   2160   1748 S   0.3  0.0   0:00.01 gcc                                                                                                                                                                      
10778 stan      20   0    9800   2084   1684 S   0.3  0.0   0:00.01 gcc                                                                                                                                                                      
26253 root      20   0       0      0      0 S   0.3  0.0   0:00.70 kworker/0:0                                                                                                                                                              
30076 stan      20   0  545072  29472  24320 S   0.3  0.2   0:35.49 marco                                                                                                                                                                    
30139 stan      20   0  667208  40308  19392 S   0.3  0.2   6:01.70 python                                                                                                                                                                   
    1 root      20   0  192972  13472   5188 S   0.0  0.1   1:43.77 systemd                                                                                                                                                                  
    2 root      20   0       0      0      0 S   0.0  0.0   0:00.31 kthreadd                                                                                                                                                                 
    5 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/0:0H                                                                                                                                                             
    8 root      20   0       0      0      0 S   0.0  0.0   0:00.33 rcu_sched                                                                                                                                                                
    9 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcu_bh                                                                                                                                                                   
   10 root      rt   0       0      0      0 S   0.0  0.0   0:01.55 migration/0                                                                                                                                                              
   11 root      rt   0       0      0      0 S   0.0  0.0   0:01.90 migration/1                                                                                                                                                              
   12 root      20   0       0      0      0 S   0.0  0.0   0:02.32 ksoftirqd/1                                                                                                                                                              
   14 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/1:0H                                                                                                                                                             
   15 root      rt   0       0      0      0 S   0.0  0.0   0:01.17 migration/2                                                                                                                                                              
   16 root      20   0       0      0      0 S   0.0  0.0   0:03.32 ksoftirqd/2                                                                                                                                                              
   18 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/2:0H                                                                                                                                                             
   19 root      rt   0       0      0      0 S   0.0  0.0   0:01.71 migration/3                                                                                                                                                              
   20 root      20   0       0      0      0 S   0.0  0.0   0:01.49 ksoftirqd/3                                                                                                                                                              
   22 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/3:0H                                                                                                                                                             
   23 root      rt   0       0      0      0 S   0.0  0.0   0:01.46 migration/4                                                                                                                                                              
   24 root      20   0       0      0      0 S   0.0  0.0   0:02.17 ksoftirqd/4                                                                                                                                                              
   26 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/4:0H                                                                                                                                                             
   28 root      20   0       0      0      0 S   0.0  0.0   0:02.38 ksoftirqd/5                                                                                                                                                              
   30 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/5:0H                                                                                                                                                             
   31 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 khelper                                                                                                                                                                  
   32 root      20   0       0      0      0 S   0.0  0.0   0:00.00 kdevtmpfs                                                                                                                                                                
   33 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 netns                                                                                                                                                                    
   34 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 perf
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