firefox constantly loads one CPU core to 100%

Fri Nov 26 06:46:58 UTC 2010

Hi,

i'm trying to understand, why firefox loads one core constantly up to
100% and even more ...

here the details:

> dmidecode
Base Board Information
        Manufacturer: ASUSTeK Computer INC.
        Product Name: P7H55
        Type: Motherboard

> uname -a
FreeBSD 8.1-RELEASE amd64

> dmesg
FreeBSD 8.1-RELEASE #2: Wed Nov 10 20:54:25 EET 2010
    root at adsl-62-221-48-131.dn.farlep.net:/usr/src/sys/amd64/compile/ZEUS_HOME amd64
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Core(TM) i3 CPU         540  @ 3.07GHz (3077.41-MHz K8-class CPU)
  Origin = "GenuineIntel"  Id = 0x20652  Family = 6  Model = 25  Stepping = 2
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Features2=0x98e3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT>
  AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant
real memory  = 4294967296 (4096 MB)
avail memory = 4110811136 (3920 MB)
ACPI APIC Table: <062310 APIC1147>
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
FreeBSD/SMP: 1 package(s) x 2 core(s) x 2 SMT threads
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  4
 cpu3 (AP): APIC ID:  5
ioapic0: Changing APIC ID to 6
ioapic0 <Version 2.0> irqs 0-23 on motherboard
kbd1 at kbdmux0
ichwd module loaded
cryptosoft0: <software crypto> on motherboard
acpi0: <062310 XSDT1147> on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
acpi0: reservation of fee00000, 1000 (3) failed
acpi0: reservation of 0, a0000 (3) failed
acpi0: reservation of 100000, dff00000 (3) failed
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
cpu0: <ACPI CPU> on acpi0
ACPI Warning: Incorrect checksum in table [OEMB] - 0xBB, should be 0xBA (20100331/tbutils-354)
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
acpi_hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 14318180 Hz quality 900
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
...

> pkg_info
firefox-3.6.11,1

> top
last pid:  1659;  load averages:  1.89,  1.36,  1.30                                                                                                                                                                up 0+00:58:26  08:42:18
108 processes: 3 running, 105 sleeping
CPU: 31.0% user,  0.0% nice, 19.2% system,  0.4% interrupt, 49.4% idle
Mem: 1572M Active, 127M Inact, 394M Wired, 5908K Cache, 286M Buf, 1842M Free
Swap: 16G Total, 16G Free

  PID USERNAME    THR PRI NICE   SIZE    RES STATE   C   TIME   WCPU COMMAND
 1484 zeus         12  44    0   336M   205M ucond   0  47:36 100.10% firefox-bin
 1426 zeus          1  44    0   374M   289M select  0   0:41  0.00% Xorg

> systat -v
    1 users    Load  1,44  1,46  1,35                  26 ноя 08:44

Mem:KB    REAL            VIRTUAL                       VN PAGER   SWAP PAGER
        Tot   Share      Tot    Share    Free           in   out     in   out
Act 1567116   24504  4662544    41536 2040936  count
All 1678636   26024 1078540k    59496          pages
Proc:                                                            Interrupts
  r   p   d   s   w   Csw  Trp  Sys  Int  Sof  Flt        cow    8085 total
  1         108      1161  177   1M   82  207   20        zfod        atkbd0 1
                                                          ozfod    79 psm0 irq12
18,1%Sys   0,1%Intr  7,5%User  0,0%Nice 74,4%Idle        %ozfod     1 ehci0+ 16
|    |    |    |    |    |    |    |    |    |    |       daefr     1 ehci1 23
=========>>>>                                             prcfr  2001 cpu0: time
                                         8 dtbuf          totfr       hdac0 256
Namei     Name-cache   Dir-cache    100000 desvn          react       hdac1 257
   Calls    hits   %    hits   %      5341 numvn          pdwak       re0 irq258
       1       1 100                  1132 frevn          pdpgs       ahci0 259
                                                          intrn  2001 cpu1: time
Disks  ada0  ada1   md0 pass0 pass1                431204 wire   2001 cpu2: time
KB/t   0,00 18,00  0,00  0,00  0,00               1432868 act    2001 cpu3: time
tps       0     0     0     0     0                131188 inact
MB/s   0,00  0,01  0,00  0,00  0,00                  5908 cache
%busy     0     0     0     0     0               2035028 free
                                                   347840 buf
                                                   293088 buf 

> systat -pigs
                    /0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10
     Load Average   |||||||||                                            

                    /0%  /10  /20  /30  /40  /50  /60  /70  /80  /90  /100
root           idle XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
zeus     firefox-bi XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
root           idle XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
root           idle XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX   
root           idle XXXXXXXXXXXXXX
zeus      darktable XXXXXXX   

any advice is appreciated much.

-- 
Zeus V. Panchenko			      	        GMT+2 (EET)