The following reply was made to PR usb/176913; it has been noted by GNATS.

From: Hans Petter Selasky <h...@bitfrost.no>
To: Christian Jurk <co...@commx.ws>
Cc: freebsd-gnats-sub...@freebsd.org
Subject: Re: usb/176913: High interrupt load with ehci
Date: Wed, 13 Mar 2013 12:00:23 +0100

 On 03/13/13 11:21, Christian Jurk wrote:
 >
 >> Number:         176913
 >> Category:       usb
 >> Synopsis:       High interrupt load with ehci
 >> 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:   Wed Mar 13 10:30:01 UTC 2013
 >> Closed-Date:
 >> Last-Modified:
 >> Originator:     Christian Jurk
 >> Release:        9.1
 >> Organization:
 >> Environment:
 > FreeBSD nodame 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825: Tue Dec  4 
 > 09:23:10 UTC 2012     
 > r...@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
 >> Description:
 > The machine is having constantly high interrupt load.
 >
 > # vmstat -i
 > cjurk@nodame:~% vmstat -i
 > interrupt                          total       rate
 > irq16: ehci0                  6264477215      85601
 > irq18: xhci0                    32405333        442
 > irq23: ehci1                     4689051         64
 > cpu0:timer                      29846776        407
 > irq264: hdac0                         62          0
 > irq265: re0                     93526302       1277
 > irq267: ahci0                     737621         10
 > cpu1:timer                      55424818        757
 > Total                         6481107178      88561
 >
 > # dmesg | grep ehci
 > ehci0: <EHCI (generic) USB 2.0 controller> mem 0xf7e08000-0xf7e083ff irq 16 
 > at device 26.0 on pci0
 > usbus0 on ehci0
 > ehci1: <EHCI (generic) USB 2.0 controller> mem 0xf7e07000-0xf7e073ff irq 23 
 > at device 29.0 on pci0
 > usbus2 on ehci1
 >
 > # top -S
 > last pid: 75321;  load averages:  0.17,  0.25,  0.24    up 0+20:22:38  
 > 11:20:28
 > 70 processes:  2 running, 67 sleeping, 1 waiting
 > CPU:  0.0% user,  0.0% nice,  0.0% system, 27.4% interrupt, 72.6% idle
 > Mem: 46M Active, 792M Inact, 2863M Wired, 34M Cache, 408M Buf, 113M Free
 > Swap: 4096M Total, 7364K Used, 4089M Free
 >
 >    PID USERNAME    THR PRI NICE   SIZE    RES STATE   C   TIME   WCPU COMMAND
 >     11 root          2 155 ki31     0K    32K RUN     1  31.2H 150.29% idle
 >     12 root         16 -84    -     0K   256K WAIT    0 200:06 50.49% intr
 >      0 root        156  -8    0     0K  2496K -       1 149:25  0.00% kernel
 >     15 root         13 -68    -     0K   208K -       0   7:22  0.00% usb
 > 21961 root          4  -8    -     0K    80K tx->tx  0   2:27  0.00% zfskern
 > 80209 cjurk         1  20    0 16560K  1328K select  0   1:22  0.00% top
 >      9 root          1  16    -     0K    16K syncer  1   1:12  0.00% syncer
 >     13 root          3  -8    -     0K    48K -       0   0:55  0.00% geom
 >     14 root          1 -16    -     0K    16K -       1   0:42  0.00% yarrow
 > 22333 root          1  20    0 40724K  1044K nanslp  0   0:16  0.00% nmbd
 >   1157 root          1  20    0 12052K   532K select  0   0:16  0.00% powerd
 > 29397 cjurk         1  20    0 22928K  1600K select  0   0:11  0.00% screen
 >   1154 root          1  20    0 22196K  1268K select  1   0:08  0.00% ntpd
 >     19 root          1 -16    -     0K    16K sdflus  1   0:06  0.00% 
 > softdepflu
 >      5 root          1 -16    -     0K    16K psleep  1   0:05  0.00% 
 > pagedaemon
 >     16 root          1 -16    -     0K    16K tzpoll  1   0:04  0.00% 
 > acpi_therm
 >   1181 root          1  20    0 20252K  2148K select  1   0:03  0.00% 
 > sendmail
 >
 > The only device connected to USB is a external hard disk, which is used as 
 > storage disk (ZFS).
 >> How-To-Repeat:
 >
 >> Fix:
 >
 >
 >> Release-Note:
 >> Audit-Trail:
 >> Unformatted:
 
 Hi,
 
 If you boot a custom kernel without device ehci, is the problem still 
 the same? I suspect it is not an USB issue.
 
 --HPS
 
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