Date: Thu, 03 Mar 2005 08:04:42 +0200 From: Jari Kirma <kirma@cs.hut.fi> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/78342: top -S shows potentially incorrect CPU usage for idle thread Message-ID: <E1D6jRy-0000pP-RN@hutcs.cs.hut.fi> Resent-Message-ID: <200503030610.j236AG8x018420@freefall.freebsd.org>
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>Number: 78342
>Category: kern
>Synopsis: top -S shows potentially incorrect CPU usage for idle thread
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Mar 03 06:10:16 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Jari Kirma
>Release: FreeBSD 5.4-PRERELEASE amd64
>Organization:
Helsinki University of Technology
>Environment:
System: FreeBSD vulcan.tky.hut.fi 5.4-PRERELEASE FreeBSD 5.4-PRERELEASE #1: Wed Mar 2 20:48:13 EET 2005 kirma@xxx:/usr/obj/usr/src/sys/XXX amd64
kernel configuration:
machine amd64
cpu HAMMER
ident XXX
options PQ_CACHESIZE=512
options COMPAT_IA32
options COMPAT_LINUX32
options COMPAT_43
options PREEMPTION
options MAXDSIZ=(1024UL*1024*1024)
options MAXSSIZ=(128UL*1024*1024)
options DFLDSIZ=(1024UL*1024*1024)
options SCHED_ULE
options INET # InterNETworking
options INET6 # IPv6 communications protocols
options IPFIREWALL #firewall
options IPFIREWALL_DEFAULT_TO_ACCEPT #allow everything by default
options IPDIVERT #divert sockets
options ZERO_COPY_SOCKETS
options NETGRAPH #netgraph(4) system
options FFS # Berkeley Fast Filesystem
options SOFTUPDATES # Enable FFS soft updates support
options UFS_ACL # Support for access control lists
options UFS_DIRHASH # Improve performance on big directories
options MSDOSFS # MSDOS Filesystem
options DIRECTIO
options PROCFS # Process filesystem (requires PSEUDOFS)
options LINPROCFS
options PSEUDOFS # Pseudo-filesystem framework
options GEOM_BSD # BSD disklabels
options GEOM_GATE # Userland services.
options GEOM_LABEL # Providers labelization.
options GEOM_MBR # DOS/MBR partitioning
options GEOM_VOL # Volume names from UFS superblock
options KTRACE # ktrace(1) support
options SYSVSHM # SYSV-style shared memory
options SYSVMSG # SYSV-style message queues
options SYSVSEM # SYSV-style semaphores
options _KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time extensions
options KBD_INSTALL_CDEV # install a CDEV entry in /dev
options ADAPTIVE_GIANT # Giant mutex is adaptive.
device acpi
# Bus support. Do not remove isa, even if you have no isa slots
device isa
device pci
options AUTO_EOI_1
# ATA and ATAPI devices
device ata
device atadisk # ATA disk drives
options ATA_STATIC_ID # Static device numbering
# atkbdc0 controls both the keyboard and the PS/2 mouse
device atkbdc # AT keyboard controller
device atkbd # AT keyboard
device vga # VGA video card driver
# syscons is the default console driver, resembling an SCO console
device sc
device agp # support several AGP chipsets
device mgadrm
# Serial (COM) ports
device sio # 8250, 16[45]50 based serial ports
device ppbus
device lpt
device ppi
# PCI Ethernet NICs that use the common MII bus controller code.
# NOTE: Be sure to keep the 'device miibus' line in order to use these NICs!
device miibus # MII bus support
device fxp # Intel EtherExpress PRO/100B (82557, 82558)
device rl # RealTek 8129/8139
# Pseudo devices.
device loop # Network loopback
device mem # Memory and kernel memory devices
device io # I/O device
device random # Entropy device
device ether # Ethernet support
device sl # Kernel SLIP
device ppp # Kernel PPP
device tun # Packet tunnel.
device pty # Pseudo-ttys (telnet etc)
device md # Memory "disks"
device gif # IPv6 and IPv4 tunneling
device faith # IPv6-to-IPv4 relaying (translation)
# The `bpf' device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
device bpf # Berkeley packet filter
# USB support
device uhci # UHCI PCI->USB interface
device ohci # OHCI PCI->USB interface
device usb # USB Bus (required)
device ugen # Generic
device uhid # "Human Interface Devices"
device ukbd # Keyboard
device ulpt # Printer
device umass # Disks/Mass storage - Requires scbus and da
device ums # Mouse
# SCSI peripherals
device scbus # SCSI bus (required for SCSI)
device da # Direct Access (disks)
dmesg output:
Copyright (c) 1992-2005 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
FreeBSD 5.4-PRERELEASE #1: Wed Mar 2 20:48:13 EET 2005
kirma@xxx:/usr/obj/usr/src/sys/XXX
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Athlon(tm) 64 Processor 3200+ (2211.08-MHz K8-class CPU)
Origin = "AuthenticAMD" Id = 0xfc0 Stepping = 0
Features=0x78bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2>
AMD Features=0xe0500800<SYSCALL,NX,MMX+,LM,3DNow+,3DNow>
real memory = 536805376 (511 MB)
avail memory = 509415424 (485 MB)
ACPI APIC Table: <VIAK8 AWRDACPI>
ioapic0 <Version 0.3> irqs 0-23 on motherboard
acpi0: <VIAK8 AWRDACPI> on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x4008-0x400b on acpi0
cpu0: <ACPI CPU> on acpi0
acpi_button0: <Power Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
agp0: <VIA 8385 host to PCI bridge> mem 0xd0000000-0xd7ffffff at device 0.0 on pci0
pcib1: <PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
drm0: <Matrox G550 (AGP)> mem 0xdb000000-0xdb7fffff,0xda000000-0xda003fff,0xd8000000-0xd9ffffff irq 16 at device 0.0 on pci1
info: [drm] AGP at 0xd0000000 128MB
info: [drm] Initialized mga 3.1.0 20021029 on minor 0
fxp0: <Intel 82558 Pro/100 Ethernet> port 0xc000-0xc01f mem 0xde000000-0xde0fffff,0xde100000-0xde100fff irq 18 at device 10.0 on pci0
miibus0: <MII bus> on fxp0
inphy0: <i82555 10/100 media interface> on miibus0
inphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fxp0: Ethernet address: 00:90:27:12:95:fd
pci0: <multimedia, audio> at device 13.0 (no driver attached)
atapci0: <VIA 8237 UDMA133 controller> port 0xd400-0xd40f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 15.0 on pci0
ata0: channel #0 on atapci0
ata1: channel #1 on atapci0
uhci0: <VIA 83C572 USB controller> port 0xd800-0xd81f irq 21 at device 16.0 on pci0
usb0: <VIA 83C572 USB controller> on uhci0
usb0: USB revision 1.0
uhub0: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1: <VIA 83C572 USB controller> port 0xdc00-0xdc1f irq 21 at device 16.1 on pci0
usb1: <VIA 83C572 USB controller> on uhci1
usb1: USB revision 1.0
uhub1: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2: <VIA 83C572 USB controller> port 0xe000-0xe01f irq 21 at device 16.2 on pci0
usb2: <VIA 83C572 USB controller> on uhci2
usb2: USB revision 1.0
uhub2: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
ugen0: TechnoTrend AG TT-DVB-C USB, rev 1.00/1.00, addr 2
uhci3: <VIA 83C572 USB controller> port 0xe400-0xe41f irq 21 at device 16.3 on pci0
usb3: <VIA 83C572 USB controller> on uhci3
usb3: USB revision 1.0
uhub3: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub3: 2 ports with 2 removable, self powered
pci0: <serial bus, USB> at device 16.4 (no driver attached)
isab0: <PCI-ISA bridge> at device 17.0 on pci0
isa0: <ISA bus> on isab0
rl0: <RealTek 8139 10/100BaseTX> port 0xe800-0xe8ff mem 0xde102000-0xde1020ff irq 18 at device 19.0 on pci0
miibus1: <MII bus> on rl0
rlphy0: <RealTek internal media interface> on miibus1
rlphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
rl0: Ethernet address: 00:0f:ea:57:ef:7e
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
sio0: type 16550A
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
sio1: <16550A-compatible COM port> port 0x2f8-0x2ff irq 3 on acpi0
sio1: type 16550A
atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
orm0: <ISA Option ROM> at iomem 0xc0000-0xc8fff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounter "TSC" frequency 2211075662 Hz quality 800
Timecounters tick every 1.000 msec
ipfw2 initialized, divert enabled, rule-based forwarding disabled, default to accept, logging disabled
ad0: 117800MB <HDS722512VLAT80/V33OA60A> [239340/16/63] at ata0-master UDMA100
Mounting root from ufs:/dev/ad0s1a
IP Filter: v3.4.35 initialized. Default = pass all, Logging = enabled
>Description:
Idle process never shows more than 92.19% CPU usage, although
"CPU states" line would suggest otherwise. Below is a dump of
top -Ss30 from idle test system, with all processes that have consumed
up to one second.
last pid: 70298; load averages: 0.00, 0.00, 0.00 up 0+10:22:31 07:52:07
122 processes: 2 running, 87 sleeping, 33 waiting
CPU states: 0.0% user, 0.0% nice, 0.1% system, 0.2% interrupt, 99.7% idle
Mem: 144M Active, 220M Inact, 46M Wired, 20M Cache, 60M Buf, 3280K Free
Swap: 1024M Total, 9288K Used, 1015M Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
11 root 171 52 0K 16K RUN 517:31 91.41% 91.41% idle
29 root -68 -187 0K 16K WAIT 0:39 0.00% 0.00% irq18: fxp0 rl0
36 root -28 -147 0K 16K WAIT 0:33 0.00% 0.00% swi5: clock sio
35 root -44 -163 0K 16K WAIT 0:18 0.00% 0.00% swi1: net
70000 root 76 0 82480K 48764K select 0:15 0.00% 0.00% Xorg
56 root 20 0 0K 16K syncer 0:14 0.00% 0.00% syncer
28 root -80 -199 0K 16K WAIT 0:12 0.00% 0.00% irq17: oss
53 root 171 52 0K 16K pgzero 0:12 0.00% 0.00% pagezero
54 root -16 0 0K 16K psleep 0:11 0.00% 0.00% bufdaemon
4 root -8 0 0K 16K - 0:08 0.00% 0.00% g_down
3 root -8 0 0K 16K - 0:06 0.00% 0.00% g_up
70083 kirma 20 0 165M 59852K kserel 0:06 0.00% 0.00% mozilla-bin
38 root -16 0 0K 16K - 0:03 0.00% 0.00% yarrow
25 root -64 -183 0K 16K WAIT 0:02 0.00% 0.00% irq14: ata0
524 root 76 0 2504K 532K select 0:02 0.00% 0.00% moused
51 root -16 0 0K 16K psleep 0:01 0.00% 0.00% pagedaemon
651 kirma 76 0 29456K 1580K select 0:01 0.00% 0.00% sshd
70047 kirma 76 0 80228K 15444K select 0:01 0.00% 0.00% xfce4-panel
70265 kirma 76 0 43252K 17012K select 0:01 0.00% 0.00% emacs
2 root -8 0 0K 16K - 0:01 0.00% 0.00% g_event
396 root 76 0 7676K 1140K select 0:01 0.00% 0.00% ntpd
70051 kirma 76 0 76116K 14628K select 0:01 0.00% 0.00% xfdesktop
475 dhcpd 76 0 4068K 1152K select 0:01 0.00% 0.00% dhcpd
70045 kirma 76 0 54636K 10460K select 0:01 0.00% 0.00% xfwm4
>How-To-Repeat:
Run top -S on idle system and observe.
>Fix:
Unknown.
>Release-Note:
>Audit-Trail:
>Unformatted:
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