2 x quad-core system is slower that 2 x dual core on FreeBSD

Alexey Popov lol at chistydom.ru
Mon Nov 19 07:13:03 PST 2007


Hi.

Ivan Voras wrote:
>> CPU states:  9.5% user,  0.0% nice, 82.0% system,  0.5% interrupt,  8.0%
>> idle
> A wild idea that might not help: try reducing kern.hz in loader.conf to
> something like 100 and see if something significant changes.
Now it runs with hz=100, number of context switches became ~ 2 times
less, but still there's 90% system CPU load (see attach).

With best regards,
Alexey Popov











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    1 users    Load 16.36 12.24  6.14                  Nov 19 18:08

Mem:KB    REAL            VIRTUAL                       VN PAGER   SWAP PAGER
        Tot   Share      Tot    Share    Free           in   out     in   out
Act  366988   16952   834288    37248 3515624  count     1
All  423228   18472  5089568    41144          pages     4
Proc:                                                            Interrupts
  r   p   d   s   w   Csw  Trp  Sys  Int  Sof  Flt      1 cow    3917 total
 31          24       98k  35k  95k 2315  100  29k  29919 zfod        sio0 irq4
                                                          ozfod       ata0 irq14
48.6%Sys   1.0%Intr 49.5%User  0.0%Nice  1.0%Idle        %ozfod     5 mfi0 irq18
|    |    |    |    |    |    |    |    |    |    |       daefr       uhci0 uhci
========================+>>>>>>>>>>>>>>>>>>>>>>>>>   1709 prcfr   200 cpu0: time
                                         4 dtbuf    23140 totfr  2311 em0 irq256
Namei     Name-cache   Dir-cache    100000 desvn          react   200 cpu2: time
   Calls    hits   %    hits   %      1494 numvn          pdwak   200 cpu3: time
  147517  147514 100                   158 frevn          pdpgs   200 cpu1: time
                                                          intrn   200 cpu4: time
Disks mfid0                                        106840 wire    200 cpu7: time
KB/t  20.20                                        355720 act     201 cpu5: time
tps       5                                         21248 inact   200 cpu6: time
MB/s   0.10                                          1228 cache
%busy     1                                       3514792 free
                                                    65056 buf






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