>Number:         172199
>Category:       usb
>Synopsis:       high interrupts load xhci
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-usb
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Oct 01 08:20:03 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator:     Aleksei Reytsman
>Release:        9.0
>Organization:
Solvex-Tourne ltd
>Environment:
# uname -a
FreeBSD servergate 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Wed Mar 28 15:00:36 MSK 
2012     root@servergate:/usr/src/sys/amd64/compile/MYKERNEL  amd64
>Description:
Hello.
I have a very high interrupts load on my FreeBSD machine. It happens when i 
plug any USB device (like a keyboard), and the load is still high after 
disconnecting the device. It becomes normal after reboot.
My system based on ASUS P8Z68-V Pro/Gen3 motherboard.
MYKERNEL is the GENERIC kernel with ipfw support.
Sorry for bad English.
Some debug information below:

# vmstat -i
interrupt                          total       rate
irq16: xhci1                 10760525071      17776
irq23: ehci0 ehci1               1826517          3
cpu0:timer                     619928626       1024
irq256: em0:rx 0                54277776         89
irq257: em0:tx 0                42013316         69
irq258: em0:link                       2          0
irq262: em2:rx 0               541775211        895
irq263: em2:tx 0               498677204        823
irq264: em2:link                       1          0
irq265: em3:rx 0               300580772        496
irq266: em3:tx 0               593156009        979
irq268: ahci0                    5757554          9
cpu1:timer                     123236782        203
cpu3:timer                     100504666        166
cpu2:timer                      58767827         97
Total                        13701027334      22634

# systat -vmstat
    1 users    Load  0.32  0.51  0.50                  Oct  1 11:52

Mem:KB    REAL            VIRTUAL                       VN PAGER   SWAP PAGER
        Tot   Share      Tot    Share    Free           in   out     in   out
Act 1481080  158408  5595688   175752 2913052  count
All 1581028  164260 1079516k   209568          pages
Proc:                                                            Interrupts
  r   p   d   s   w   Csw  Trp  Sys  Int  Sof  Flt        cow    173k total
            137      349k   24  122 171k 1055    3        zfod   166k xhci1 16
                                                          ozfod     3 ehci0 ehci
 0.1%Sys  18.0%Intr  0.0%User  0.0%Nice 81.9%Idle        %ozfod  1128 cpu0:timer
|    |    |    |    |    |    |    |    |    |    |       daefr    76 em0:rx 0
+++++++++                                                 prcfr    72 em0:tx 0
                                        17 dtbuf        3 totfr       em0:link
Namei     Name-cache   Dir-cache    204931 desvn          react  1216 em2:rx 0
   Calls    hits   %    hits   %    179871 numvn          pdwak  1146 em2:tx 0
     353     353 100                 49693 frevn          pdpgs       em2:link
                                                          intrn   933 em3:rx 0
Disks  ada0  ada1 pass0 pass1                      731484 wire   1312 em3:tx 0
KB/t  30.98 30.98  0.00  0.00                     1123916 act      24 ahci0 268
tps      12    12     0     0                     3233464 inact   914 cpu1:timer
MB/s   0.35  0.35  0.00  0.00                         276 cache   139 cpu3:timer
%busy     0     0     0     0                     2912776 free     72 cpu2:timer
                                                   837152 buf
# pciconf -lv
hostb0@pci0:0:0:0:      class=0x060000 card=0x844d1043 chip=0x01008086 rev=0x09 
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '2nd Generation Core Processor Family DRAM Controller'
    class      = bridge
    subclass   = HOST-PCI
- - - - -
xhci0@pci0:4:0:0:       class=0x0c0330 card=0x84881043 chip=0x10421b21 rev=0x00 
hdr=0x00
    vendor     = 'ASMedia Technology Inc.'
    device     = 'ASM1042 SuperSpeed USB Host Controller'
    class      = serial bus
    subclass   = USB
- - - - -
xhci1@pci0:7:0:0:       class=0x0c0330 card=0x84881043 chip=0x10421b21 rev=0x00 
hdr=0x00
    vendor     = 'ASMedia Technology Inc.'
    device     = 'ASM1042 SuperSpeed USB Host Controller'
    class      = serial bus
    subclass   = USB
>How-To-Repeat:
Plug any USB device.
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:
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