Date: Wed, 13 Mar 2013 10:21:35 GMT From: Christian Jurk <commx@commx.ws> To: freebsd-gnats-submit@FreeBSD.org Subject: usb/176913: High interrupt load with ehci Message-ID: <201303131021.r2DALZ73062008@red.freebsd.org> Resent-Message-ID: <201303131030.r2DAU2Ok033654@freefall.freebsd.org>
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>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 root@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:
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