[asterisk-users] bad performance centos6 ->centos7

[Marek Červenka]

found interesting difference

centos6 have increasing "Function call interrupts" only on cpu4 (its 2x 
quad core system with HT cpu0-cpu15)
  RES:    6286605    2569745    1885919    1842514    2177536 2138628    
1761718    1838163    3668947    2597374    1849095 1679889    
2736591    2523227    1751432    1611744   Rescheduling interrupts
  CAL:        248        362        366        362 40923894        
349        357        361        345 305        364        367        
363        337        356 352   Function call interrupts

centos7 have "Function call interrupts" distributed to all cpus
RES:      18659      22826      17808      14357      42245 36973      
29927      24703      15279       9098       7984 6564      27054      
23757      19585      16525   Rescheduling interrupts
  CAL:     304288      30969      30869      30555      39649 34481      
32515      28972      11286      22461      22623 22792      25012      
24027      22610      21718   Function call interrupts

any ideas?

Dne 9.11.2015 v 13:28 Marek Červenka napsal(a):
> found this interesting article
> http://stackoverflow.com/questions/12111954/context-switches-much-slower-in-new-linux-kernels 
>
>
> running with network-latency profile and its better now but still not 
> good as centos6
>
> [root at ast1 ~]# tuned-adm active
> Current active profile: network-latency
>
>
> Dne 6.11.2015 v 10:18 Marek Červenka napsal(a):
>> hi,
>>
>> i'm evaluating performance of centos7
>> i did tests on centos6 x86_64/distro kernel 2.6.32, asterisk 11.16.0 
>> with 500calls (7sec alaw, simple dialplan, pass trough - sipp 
>> generators/asterisk receiver with answer/playback)
>> scenario - sipp generators - asterisk - asterisk receiver (i wrote 
>> ansible scenario for this if you are interested)
>>
>> then i reinstalled system to
>> centos7 x86_64/distro kernel 3.10, asterisk 11.20.0 and run the test 
>> again
>>
>> there is big performance hit
>> https://dl.dropboxusercontent.com/u/44105720/context_interrupts.PNG
>> https://dl.dropboxusercontent.com/u/44105720/cpu.PNG
>> https://dl.dropboxusercontent.com/u/44105720/load.PNG
>>
>> any ideas what tweaks can help?  (it looks like the main problem is 
>> in interrupts from network card)
>> your experience with centos7?
>> any experience with kernel 4.2 from 
>> http://elrepo.org/linux/kernel/el7/x86_64/RPMS/ ?
>>
>>
>>
>
>


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Marek Cervenka
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